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14th International LS-DYNA Conference

Detroit, 2016

*MAT_PAPER and *MAT_COHESIVE_PAPER: Two New Models for Paperboard Materials
Jesper Karlsson, Mikael Schill 1 (DYNAmore Nordic)
Johan Tryding (Tetra Pak)
We here present two new material models for the modeling of paperboard materials. The main motivation for the models is to accurately simulate the production of food and beverage containers for the packaging industry. The main material, *MAT_PAPER, is an orthotropic elastoplastic model that supports both solid and shell elements. In conjunction, an elastoplastic cohesive material, *MAT_COHESIVE_PAPER, is introduced to simulate delamination. ...
A 6 Year-Old Pediatric Finite Element Model for Simulating Pedestrian Impacts
Yunzhu Meng, Costin D. Untaroiu (Virginia Tech, virginia Tech-Wake Forest Center for Injury Biomechanics)
Berkan Guleyupoglu, Bharath Koya, Scott Gayzik (Wake Forest University School of Medicine, Virginia Tech-Wake Forest Center for Injury Biomechanics)
In addition to adult pedestrian protection, child pedestrian protection continues to be an important issue in vehicle crash safety. However, with exception of a child headform impact test, all other subsystem tests are designed for prediction of adult pedestrian injuries. The development of a computational child model could be a better alternative that characterizes the whole-body response of vehicle–pedestrian interactions and assesses ...
A Cohesive Element Model for Large-Scale Crash Analyses in LS-DYNA ®
Johan Kolstø Sønstabø, David Morin, Magnus Langseth (SIMLab and CASA)
In a recent study the cohesive element model *MAT_240 was evaluated for macroscopic modelling of two different Flow-Drill Screw (FDS) connections in large-scale analyses [1]. The study showed that *MAT_240 does not have sufficient flexibility to describe the macroscopic behaviour of the connections. In particular, the force level and initial stiffness in mixed-mode loadings were severely over-estimated. The lack of flexibility to control the ...
A Comparison of Isotropic (*MAT_224) and Anisotropic (*MAT_264) Material Models in High Velocity Ballistic Impact Simulations
Sean Haight, Cing-Dao “Steve” Kan (Center for Collision Safety and Analysis (CCSA))
Paul Du Bois (Consulting Engineer)
To improve the modeling of metals in high velocity impacts, there have been many developments in constitutive material modeling for LS-DYNA ® . One such advancement is the development of the Tabulated Johnson-Cook material model (*MAT_224). *MAT_224 is a tabulated material model with strain rate and temperature dependency. Additionally, this model includes a failure criteria as a function of triaxiality, Lode parameter, temperature, strain rate ...
A Comparison of Monolithic and Layered-Plate Configurations for Containment
Thomas J. Vasko, PhD, PE (Central Connecticut State University, New Britain)
Jet-engine fan, compressor, and turbine blades require containment cases to ensure that any released blade fragments are contained within the engine and do not penetrate the case, where they can damage critical engine components or penetrate the passenger cabin. To determine the centrifugal strength of turbomachinery rotors, disk-burst tests are performed in vertical-axis spin pits that require containment cases to ensure the safety of the ...
A Complementary Experimental and Modeling Approach for the Characterization of Maple and Ash Wood Material Properties for Bat/Ball Impact Modeling in LS-DYNA
Joshua Fortin-Smith, James Sherwood, Patrick Drane (University of Massachussets)
David Kretschmann (U.S. Forest Products Laboratory)
To assist in developing LS-DYNA finite element models of wood baseball bats that can be used to explore the relationship between bat profile and bat durability, an experimental program was conducted to characterize the mechanical behavior of maple and ash woods for the range of densities used to make major-league quality baseball bats. The test program included four-point bend testing to determine the elastic moduli and breaking strength ...
A Distributed Randle Circuit Model for Battery Abuse Simulations Using LS-DYNA ®
Pierre L’Eplattenier and Iñaki Çaldichoury (LSTC)
James Marcicki,Alexander Bartlett, Xiao Guang Yang, Valentina Mejia Min Zhu, Yijung Chen (Ford Research and Innovation Center)
Battery abuse research and modeling, Spatially-resolved battery modeling, Electro-thermal battery modeling. A distributed Randle circuit model has been added to the electromagnetics (EM) module in LS-DYNA. This model implements so called “1 st order Randle circuits” connecting two vis-à-vis nodes on the positive and negative current collectors which define a unit cell. These circuits consist of a state-of-charge dependent voltage source, ...
A Numerical Investigation of Human Biomechanical Response under Vertical Loading Using Dummy and Human Finite Element Models
Costin D. Untaroiu, Jacob Putnam (Virginia Tech)
The safety of aerospace transport for both fixed and rotary wing aircraft is evaluated primarily through testing of anthropometric test devices (ATDs), commonly known as crash test dummies. While the majority of the ATDs were certified under automotive horizontal impact conditions, their biofidelity under vertical loading is less known. The objective of this study was to compare the THOR-K dummy model response to the corresponding response ...
A Process for Robust Design of a Vehicle Front Structure Using Statistical Approach
Masahiro OKAMURA (JSOL Corporation)
In recent years, it has become more and more important to take scatter into account in automotive industry. Liability and performance has been guaranteed by adding safety margin to its target in the past. However, needs in cost reduction and trade-off of conflicting requirements do not allow manufacturers enough amount of safety margin any longer[1]. One way to reduce scatter in product performance is to control production quality. However, ...
A Robust Cohesive Zone Model for Cyclic Loading
Ala Tabiei, Wenlong Zhang (University of Cincinnati)
Cohesive element approach is a promising way to simulate crack propagation. Commonly used cohesive laws include bilinear law, trapezoidal law and exponential law. However, research has found that when exponential cohesive law is unloading or reloading, the traction curve cannot remain continuous when the mixed mode ratio changes. (Kregting 2005) [1] In this paper, the discontinuity behavior of exponential law is discussed and a remedy is given ...
A Standardized Mechanism to Validate Crash Models for Ductile Plastics
Megan Lobdell, Brian Croop, Hubert Lobo (DatapointLabs)
Quantifying simulation accuracy before running crash simulations could be a helpful confidence building measure. This study continues our development of a mechanism to validate material models for plastics used in modeling high-speed impact. Focusing on models for isotropic materials that include options for rate dependency and failure, we explore other models commonly used for ductile plastics including MAT089 and MAT187.
A Study of MPP LS-DYNA ® Performance on Hardware Configurations
Yih-Yih Lin and Toshihiro Ishibashi (Hewlett Packard Enterprise)
With vehicle crash simulation models of sizes up to 10M elements, this paper will investigate how LS-DYNA performance is affected by the four hardware components: processor, I/O, memory, and interconnect network. First, two aspects of processor will be studied: performance gain from Intel Turbo Boost and performance gain from the AVX2 over the SSE2 instruction set architecture. Second, performances of using a local storage, a shared NFS file ...
Adaptive Thermal Boundary Conditions for Smoothed Particle Hydrodynamics
Kirk Fraser (University of Quebec at Chicoutimi, Predictive Engineering)
Laszlo I. Kiss, Lyne St-George (Predictive Engineering)
Smoothed Particle Hydrodynamics (SPH) is a robust meshfree approach for the simulation of large plastic deformation processes such as high speed cutting, forging, extrusion, and friction welding. Often, heat transfer is an important consideration for such industrial processes; for this reason, the effects of heat loss from convection, radiation, or flux from the free surface should be included. However, because of the meshfree nature of SPH, ...
Advances in LS-DYNA ® Metal Forming (I)
Xinhai Zhu, Li Zhang and Yuzhong Xiao (LSTC)
Some of the new features developed since the last conference will be discussed. 1) Movable adaptive fission/fusion box The movable fission/fusion box is an essential enabler in completing a simulation in a efficient manner, especially in cases where deformation is relatively localized. Related keywords include: *CONTROL_ADAPTIVE, *DEFINE_BOX_ADAPTIVE. 2) Checking fixture clamp definition and simplification of FORMING contact ...
Advances in LS-DYNA ® Metal Forming (II)
Xinhai Zhu, Li Zhang and Yuzhong Xiao (LSTC)
Some of the new features developed since the last conference will be discussed. 1) Implementation of Stoughton’s Non-Associate Flow Model (*MAT_260A) Strain rate sensitive, non-associated flow material model suitable for metal forming simulation. 2) Implementation of Mohr’s Non-Associate Flow Model (*MAT_260B) Strain rate sensitive and temperature softening effect coupled with a non-associated flow rule, combined with a ductile fracture ...
Airbag Inflator Models in LS-DYNA ®
Kyoung-Su Im, Zeng-Chan Zhang, and Grant O. Cook, Jr. (LSTC)
New inflator models for the automotive air bag are developed for the pyrotechnic and hybrid inflation modes. Several propellant examples including Sodium azide(NaN 3 ), Azodicarbonamide(C 2 H 4 N 4 O 2 ), and Guanidine nitrate(CH 6 N 4 O 3 ) are designed for users. To control the gas compositions into the airbag and the flame temperature in the combustion chamber, we modified an existing chemical equilibrium code, PEP(Cruise,1973) and provide ...
An Investigation into the Relationship between Wood Bat Durability and Bat Taper Geometry using LS-DYNA ®
Joshua Fortin-Smith, James Sherwood, Patrick Drane (University of Massachusetts Lowell Baseball Research Center)
David Kretschmann (U.S. Forest Products Laboratory)
Changes in the Wooden Baseball Bat Standards (WBBS) by the Office of the Commissioner of Baseball in cooperation with the MLB Players Association in response to recommendations made by a task force comprised wood and baseball science experts have produced a 65% reduction in the rate of multi-piece failures (MPFs) of bats since 2008. It is hypothesized that the rate of MPFs can be further reduced if regulations on the allowable geometries of the ...
Analysis and Testing of a Composite Fuselage Shield for Open Rotor Engine Blade-Out Protection
J. Michael Pereira, Charles R. Ruggeri, Duane M. Revilock (NASA Glenn Research Center)
William Emmerling (FAA William J. Hughes Technical Center, Atlantic City)
Silvia Seng, Charles Frankenberger (Naval Air Warfare Center, China Lake)
Kelly S. Carney (George Mason University)
The Federal Aviation Administration is working with the European Aviation Safety Agency to determine the certification base for proposed new engines that would not have a containment structure on large commercial aircraft. Equivalent safety to the current fleet is desired by the regulators, which means that loss of a single fan blade will not cause hazard to the Aircraft. The NASA Glenn Research Center and The Naval Air Warfare Center (NAWC), ...
Analysis of High Velocity Impact Penetration Using the Smoothed Particle Galerkin Method
Youcai Wu, Yong Guo, C. T. Wu, Wei Hu (LSTC)
Joseph Magallanes (Karagozian & Case)
Impact penetration is a very complex multi-physics procedure, which involves localized damage, large degree of material fragmentation (failure) and separation (ejecta), complicated projectile – target interaction. The mathematical models of these problems are often ill-posed and the corresponding numerical solutions are generally non-smooth. In essence, severe mesh distortion would occur if Lagrangian finite element method (FEM) is used. ...
Application of LS-DYNA ® to NVH Solutions in the Automotive Industry
Prasanna S. Kondapalli, Tyler Jankowiak (BASF Corp.)
Yun Huang (LSTC Corp. Livermore)
There are a number of powertrain applications in the Automotive Industry made of short glass fiber reinforced thermoplastics (Polyamide 6 or 66). Examples of these are Air Intake Manifolds, Cylinder Head Covers (CHC’s), Oil Pans etc. Assessment of NVH (Noise, Vibration & Harshness) characteristics using simulation tools is a critical requirement for such applications. Modal analysis, steady state dynamic analysis and acoustic analysis are some ...
Application of LS-DYNA  in Structural Fatigue Analysis and Post-Processing with LS-PrePost 
Yun Huang, Zhe Cui, Philip Ho, Chengju Zhang (LSTC)
This paper provides a review of the development of LS-DYNA in structural fatigue analysis and the post-processing of the results with LS-PrePost. Fatigue is the progressive and localized structural damage that occurs when the material is subjected to cyclic loadings. Fatigue damage and failure are very common in industries. Some studies have suggested that over 80% of all mechanical failure of metal are attributable to fatigue. Starting ...
Application of the Discrete Elements Method to Frequency Analysis and Use of the “Bond” Method for Fracture Modeling
Tess Legaud, Edith Grippon,Vincent Lapoujade (DynaS+)
ierre-Louis Chiambaretto, Yves Gourinat (Université de Toulouse)
Nowadays more and more complex mechanical behaviors have to be modelled. In order to do so, the generally used numerical methods, like finite elements, show some limitations. Particularly, finite elements’ ability to model granular media is reduced, partly because of the contact handling complexity between each grain. One of the alternatives is to use meshless methods. Within the software LS-DYNA ® , there notably exists a meshless method ...
Assessing and Validating the Crash Behavior of Securalex®HS, a High-Strength Crashworthy Aluminum Alloy, Using the GISSMO Model
Callum J. Corbett, Laurent Laszczyk, Olivier Rebuffet (Constellium Technology Center)
Specialized aluminum alloys play an ever increasing role in today’s automotive industry. The desire for lightweighting is driven by both performance aspects as well as the legislative framework regarding emissions and fuel efficiency. Using aluminum rolled products for structural car body parts requires good formability and high mechanical properties paired with predictable and safe performance under crash loading. Simulating and predicting ...
Battery Abuse Case Study Analysis Using LS-DYNA ®
James Marcicki, Alexander Bartlett, Xiao Guang Yang, Valentina Mejia, Min Zhu, Yijung Chen (Ford Research and Innovation Center)
Pierre L’Eplattenier, Iñaki Çaldichoury (LSTC)
Battery abuse research and modeling, Spatially-resolved battery modeling, Electro-thermal battery modeling. As Lithium-ion batteries see increasing use in a variety of applications, anticipation of the response to abuse conditions becomes an important factor in designing optimized systems. Abuse scenarios with potential relevance to the automotive industry include crash-induced crush leading to an internal short circuit, external short ...
Broad-Spectrum Stress and Vibration Analysis of Large Composite Container
Adrian Jensen, George Laird (Predictive Engineering, Inc.)
Adrian Tayne (ECS Case, Becklin Holdings, Inc.)
A large composite shipping container was analyzed for drop, impact, PSD random vibration and general stress analysis. The main shell of the container was a glass-fiber vacuum infused composite with closures made of aluminum. Lifting rings and other major structural load points were attached to the composite container using thick aluminum plates with preloaded bolts to distribute point loads into the shell. The uniqueness of this work was ...
Calculating Electromagnetic Field (EMF) Distortion to Maintain and Secure Electric Transmission Lines
John Puryear, David Rodriguez (ABS Consulting)
Iñaki Çaldichoury (Livermore Software Technology Corporation)
Critical to the electric power grid are the high voltage transmission lines. These assets are geographically dispersed and typically transverse large distances across remote areas. Those attributes make them challenging to maintain and physically secure. Electrical power system operators are continually improving data acquisition and interpretation to draw new inferences about system performance. These advances raise the possibility of ...
Characterization of the Lode = -1 Meridian on the Al-2024 Failure Surface for *MAT_224 in LS-DYNA ®
Robert L. Lowe, Jeremy D. Seidt, Amos Gilat (The Ohio State University)
A key ingredient in the modeling of ductile fracture using *MAT_224 in LS-DYNA is the failure surface, a 3-D graphical representation of the equivalent plastic strain at failure as a function of stress triaxiality and Lode parameter. Ballistic impact experiments used to validate the existing *MAT_224 plasticity and failure models for 2024 aluminum reveal a strong trend of ductile fractures along the Lode = -1 meridian, a region currently ...
Characterizing LS-DYNA ® Implicit performance on SGI ® Systems using SGI MPInside MPI profiling tool
Dr. Olivier Schreiber, Tony DeVarco, James Custer, Scott Shaw (SGI)
SGI delivers a unified compute, storage and remote visualization solution to manufacturing customers reducing overall system management requirements and costs. LS-DYNA integrates several solvers into a single code base. The implicit solver is studied for better matching with the multiple computer architectures available from SGI, namely, Multi-node Distributed Memory Processor clusters and Shared Memory Processor servers, both of which are ...
Comparison of Strategies for Landmine Modeling in LS- DYNA with Sandy Soil Material Model Development
Matt Barsotti; Eric Sammarco, Ph.D., P.E.; David Stevens, Ph.D., P.E. (Protection Engineering Consultants)
As part of the United States Marine Corps (USMC) Mitigation of Blast Injuries through Modeling and Simulation project, Protection Engineering Consultants investigated and compared a range of landmine modeling strategies in LS-DYNA. Dividing the constituent materials into solids (soil) and fluids (air and explosive burn products), various numerical formulations were applied to the two groups in different combinations. Single-formulation ...
Computational Fluid Dynamic of NACA0012 with LS-DYNA ® (ALE & ICFD) and Wind Tunnel Tests
B. Perin, O. Verdrel, P. Bordenave (DGA Aeronautical Systems)
E. Grippon, V. Lapoujade (DynaS+)
H. Belloc (Université de Toulouse)
I. Caldichoury (LSTC)
DGA Aeronautical Systems, the technical centre of the French ministry of Defense dedicated to aircraft performance testing and evaluation, combines tests and simulations to validate, among others, parachute systems for the Airdrop Department. The latter also developed modeling and simulation capabilities as a support for evaluation. In parallel, under the authority of the French Ministry of Defense, the Department of Aerodynamics, Energetics and ...
Computational Modeling of Geosynthetic Reinforced Soil (GRS) Composites Under Axial Loading
Marta Sitek, Cezary Bojanowski (Argonne National Laboratory)
Modeling the behavior of a granular medium, such as soil, as a finite element continuum is a challenging task. A significant number of constitutive models for soils are implemented in commercial software, but their application is limited to specific cases. The main goal of the work presented in this paper was to select a soil model implemented in LS-DYNA ® that performs best in simulating a laboratory compression test of geosynthetic ...
Constitutive Modeling for Composite Forming Simulation and Development of a Tool for Composite Material Design
Masato Nishi, Tei Hirashima, Sean Wang (JSOL Corporation)
Many of the existing FE models in macroscopic forming simulation of fiber fabric have neglected out-of-plane bending stiffness, by using membrane elements, as it is very low compared to in- plane stiffness. To consider this, the shell-membrane hybrid model (S-M model) proposed in the author’s previous study can capture bending stiffness as a function of the rotation of the mid- surface. However, influence of the transverse shear deformation ...
CORrelation and Analysis (CORA) in Visual-Environment
Megha Seshadri (ESI Group)
Rohit Ramanna (ESI North America)
Shivakumar Shetty (Humanetics)
CORA (Correlation and Analysis) rating is a curve comparison technique, to evaluate the time-history signals. CORA requires at least two curves for comparison, the reference curve (test result) and the comparison curve (simulation). This method is mainly used in Injury Studies.
Coupling of Particle Blast Method (PBM) with Discrete Element Method for buried mine blast simulation
Hailong Teng (LSTC)
This paper presents two meshless methods: particles blast method (PBM) and discrete element method (DEM). Particle blast method (PBM) is intend to model the gaseous behavior of high velocity, high temperature detonation products. PBM is developed based on corpuscular method (CPM), which has been successfully applied to airbag deployment simulation where the gas flow is slow. For blast simulation where gas flow is extremely high, the ...
Crash Testing and Simulation of a Cessna 172 Aircraft: Hard Landing Onto Concrete
Karen E. Jackson (NASA Langley Research Center)
Edwin L. Fasanella (National Institute of Aerospace)
A full-scale crash test of a Cessna 172 aircraft was conducted at the Landing and Impact Research Facility at NASA Langley Research Center during the summer of 2015. The purpose of the test was to evaluate the performance of Emergency Locator Transmitters (ELTs) that were mounted at various locations in the aircraft and to generate impact test data for model validation. A finite element model of the aircraft was developed for execution in ...
Crash Testing and Simulation of a Cessna 172 Aircraft: Pitch Down Impact onto Soft Soil
Edwin L. Fasanella (National Institute of Aerospace)
Karen E. Jackson (NASA Langley Research Center)
During the summer of 2015, NASA Langley Research Center conducted three full-scale crash tests of Cessna 172 (C-172) aircraft at the NASA Langley Landing and Impact Research (LandIR) Facility. The first test represented a flare-to-stall emergency or hard landing onto a rigid surface. The second test, which is the focus of this paper, represented a controlled-flight-into-terrain (CFIT) with a nose-down pitch attitude of the aircraft, which ...
Current Status of LS-DYNA ® Iso-geometric Analysis in Crash Simulation
Yijung Chen, Shih-Po Lin, Omar Faruque, Jim Alanoly, Mohammed El-Essawi, Ragu Baskaran (Ford Motor Company)
This paper reports a current implementation of Iso-geometric Analysis (IGA) in crash simulation. Several crash critical enhancements of IGA had been proposed by Ford and implemented by LSTC. Such examples include the fix of shear-locking of Mindlin-Reissner shell and the implementation of attached node to NURBS patch. The benchmark of IGA Mindlin-Reissner shell reveals the existence of mild shear-locking in the default full integration scheme. ...
Delamination Prediction of Uni-Directional Composite Laminates using Shell Elements and a Strain Rate Dependent Micro-mechanical Material Model
Sandeep Medikonda, Ala Tabiei (University of Cincinnati, Cincinnati)
The effectiveness of studying inter-laminar delamination in composites with the help of newly formulated thickness-stretch shell elements (ELFORM=25) as compared to the traditional plane-stress shell elements (ELFORM=2) has been investigated using LS-DYNA ® . A strain-rate dependent micro-mechanical material model using ply-level progressive failure criteria has been used to simulate the initiation and propagation of delamination. The ...
Design and Validation of a Crash Rated Bollard as per SD-STD-02.01 Rev. A (2003) Standard using LS-DYNA ®
Saurabh R. Deshpande, Santosh E. Chopade, N. V. Karanth (Automotive Research Association of India)
Maj. Amitava Mittra (Swaraj Secutech Pvt. Ltd.)
Use of vehicle barriers for traffic regulation is of utmost importance in a densely populated country like India. These barriers can be used effectively to divert vehicles during public events and emergency situations. Due to their periodic requirement at different locations, it is essential that the barriers provide visibility and security while remaining comparatively cheaper at the same time. Out of the different types of available ...
Design optimization with Modal Assurance Criteria (MAC)
Sumie Kinouchi, Ryo Ishii, Masahiro Okamura (JSOL Corporation)
Simulation-based optimization is one of the efficient tools for product design optimization. This paper introduces the application example of modal analysis with LS-DYNA® and mode tracking of LS-OPT ®, to improve the body stiffness. The mode tracking is a powerful tool to track a specific mode by evaluating the scalar MAC value even if the sequence of modes is changed due to the modification of the design variables by the optimizer. For the ...
Development and Validation of a 95 th Percentile Male Pedestrian Finite Element Model
Wansoo Pak, Costin D. Untaroiu (Virginia Tech)
The pedestrian is one of the most vulnerable road users. Given an impact event, the probability of a pedestrian fatality in a traffic crash is almost two times higher than that for a vehicle occupant. Therefore, pedestrian protection regulations which involve subsystem tests in car-to-pedestrian collisions (CPC) have been proposed in Europe and Asia. In addition, human finite element (FE) models have been developed to better understand the ...
Development and Validation of Bolted Connection Modeling in LS-DYNA ® for Large Vehicle Models
Michalis Hadjioannou, David Stevens, Matt Barsotti (Protection Engineering Consultants LLC)
As part of the United States Marine Corps (USMC) Mitigation of Blast Injuries through Modeling and Simulation project, Protection Engineering Consultants performed numerical and experimental investigations to develop modeling approaches for bolted connections. Vehicle models require efficient yet accurate methods to represent bolted connections, especially under extreme loading situations where connection behavior may have crucial impact on ...
Development of a Finite Element Model of a Motorcycle
N. Schulz, C. Silvestri Dobrovolny and S. Hurlebaus (Texas A&M Transportation Institute)
Over the past years, extensive research efforts have been made to improve roadside safety hardware to reduce injury to occupants of four wheel vehicles and heavy trucks. In comparison, limited research has been conducted to address the safety of motorcycle riders when impacting roadside safety hardware. The vulnerability of motorcycle riders can lead to a high risk of injury for the rider, especially when impacting roadside barriers. In ...
Development of a Finite Element Model of the WIAMan Lower Extremity to Investigate Under-body Blast Loads
Wade Baker, Costin Untaroiu (Virginia Tech)
Mostafiz Chowdhury (US Army Research Laboratory)
Occupants of military vehicles are likely to be subjected to an under-body blast (UBB) resulting from anti – vehicular land mines and improvised explosive devices (IEDs). For years the automotive industry has successfully used human anthropomorphic test devices (ATDs) to help quantify the occupant injury risk over a wide range of impact scenarios. However, it has been proven that these ATDs are inadequate when it comes to accurately ...
Development of a Simplified Finite Element Approach for Investigation of Heavy Truck Occupant Protection in Frontal Impacts and Rollover Scenarios
C. Silvestri Dobrovolny, N. Schulz (Texas A&M University System)
A finite element model combining a heavy truck conventional-type cabin structure, its interior components, ATD, and passive restraint systems was developed to simulate real-world typical crash scenarios, such as frontal impacts and rollover crashes. These crash scenarios are considered conditions for which there is need and still room for improvement in terms of occupant safety. This paper describes the modeling effort to develop a cabin ...
Development of a Subcell Based Modeling Approach for Modeling the Architecturally Dependent Impact Response of Triaxially Braided Polymer Matrix Composites
Christopher Sorini, Aditi Chattopadhyay (Arizona State University)
Robert K. Goldberg, and Lee Kohlman (NASA Glenn Research Center)
Understanding the high velocity impact response of polymer matrix composites with complex architectures is critical to many aerospace applications, including engine fan blade containment systems where the structure must be able to completely contain fan blades in the event of a blade-out. Despite the benefits offered by these materials, the complex nature of textile composites presents a significant challenge for the prediction of deformation ...
Droptower Impact Testing & Modeling of 3D-Printed Biomimetic Hierarchical Composites
Grace Xiang Gu, Steven Kooi, Markus J. Buehler (Massachusetts Institute of Technology)
Alex J. Hsieh (Massachusetts Institute of Technology,US Army Research Laboratory)
Chian-Feng Yen (US Army Research Laboratory)
Inspired by the hierarchical designs of natural materials, this paper highlights the use of 3D-printing as a plausible pathway to discern and differentiate material attributes critical to desirable impact properties. A comprehensive study was focused on the influence of three different hierarchical designs derived from a nacre-like architecture, where two base materials varying vastly in properties were used to evaluate the low-velocity ...
Durability assessment of welded structures based on welding simulation with LS-DYNA ®
Andriy Krasovskyy (DYNAmore Swiss GmbH)
Antti Virta (Winterthur Gas & Diesel Ltd)
Thomas Klöppel (DYNAmore GmbH)
The importance of welding for modern structural engineering cannot be emphasized enough. Different techniques are currently applied in the industrial environment offering almost unlimited possibilities regarding manufacturability with high cost effectiveness. At the same time the requirements on welded structures are increasing and so the requirements on the design methods. This paper presents an advanced calculation method for fatigue ...
Durability Study for Tractor Seat Using LS-DYNA ®
Jithesh Erancheri, Ramesh Venkatesan (Kaizenat Technologies Pvt Ltd)
Today in many tractors with enclosed cabs, an extra seat named as 'instructor seat' are available. As a regular driver seat, this seat should also undergo the same testing and product validation process. This seat is incorporated to serve various purposes like enhances the training of tractor operators, facilitates communications between workers, improves the demonstration of for-sale tractors, transports workers to worksites, assists operations ...
Effect of Thin-walled Tube Geometry on Its Crashworthiness Performance
Anton Kuznetcov, Igor Telichev, Christine Q. Wu (University of Manitoba)
The present paper deals with the numerical analysis supporting the crashworthiness design of a thin-walled tube. The thickness and wall shape were parametrically changed to study their effect on the tube performance under the axial impact. Different tube geometries were evaluated based on the common crashworthiness criteria to identify the effective designs which provide the efficient energy absorption and low peak force. The applicability of ...