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10th European LS-DYNA Conference

Würzburg, 2015

Enabling Effective and Easy to Access Simulation
E. Schnepf (Fujitsu Technology Solutions)
S. Gillich (Intel)
Evaluation of Kinematic Hardening Models for Multiple Stress Reversals under Continuous Cyclic Shearing and Multi-Step Bending
S. Suttner, M. Rosenschon, Prof. M. Merklein (University of Erlangen-Nürnberg)
In complex sheet metal forming processes the material undergo es various strain path changes, for instance, during the passing of a drawbead or a radius. Based on the Bauschinger effect that describes the material’s specific decrease of the yield stress after a load reversal, the resultant hardening behavior significantly differs from that o f a monotonic loading condition. For a reliable numerical process design, ...
Failure of Thermoplastics – Part 1: Characterization and Testing
A. Fertschej, P. Reithofer, M. Rollant (4a engineering)
Complex material models are much more used nowadays. The reasons are the increasing usage of plastics in high security relevance automotive and the resulting demand for virtual modeling including damage and failure.
Failure of Thermoplastics – Part 2 Material Modeling and Simulation
A. Fertschej, M. Rollant, P. Reithofer (4a engineering)
Complex material models are much more used nowadays. The reasons are the increasing usage of plastics in high security relevance automotive and the resulting demand for virtual modeling including damage and failure.
Fast Road Barrier Car Safety Calculations on a Cray XC
J. Cholewinski, A. Findling, G. Clifford (Cray)
M. Piechnik (Stalprodukt)
Despite progress achieved in the last decade, 70 people die and more than 650 are seriously injured every day on Europe’s road. As one of the most cost-effective safety infrastructure solutions available to policy makers, vehicle restraint systems can greatly contribute to alleviating the consequences of road accidents and increase levels of safety on European roads.
Forming Simulation of Textile Composites Using LS-DYNA
M. Nishi, T. Hirashima (JSOL)
The primary focus of this paper is on FE modeling and simulations performed to capture the material behaviors during a textile preform and a thermoplastic pre-preg forming manufacturing using LS-DYNA. Although an out-of-plane bending stiffness of textile reinforcement is often ignored as it is very low compared to in-plane stiffness, more accurate simulation, especially prediction of wrinkles, is achievable by considering out-of-plane bending ...
Generalized Anistropic/Isotropic Porous Media Flows in LS-DYNA
R. R. Paz, F. Del Pin, I. Caldichoury (LSTC)
H. G. Castro (Conicet)
In recent years industries like aerospace, automotive and those related to oil production have increased their trustfulness on numerical models and codes for the design, research, production and verification of highly critical parts and production processes. Most of these industries have adopted manufacturing procedures involving composites materials in liquid state, like the Liquid Composite Molding (LCM) and the High Pressure Resin Transfer ...
GOM Company Overview.pdf
Ground Vehicle Aerodynamics using LS-DYNA
F. Del Pin, I. Caldichoury, R. R. Paz (LSTC)
The use of software for the simulation of airflow around ground vehicles plays an important role in the design of a vehicle. Traditionally companies within the automotive industry sector have a Computational Fluid Dynamics department dedicated to the analysis of drag and lift with the objective of improving fuel efficiency, safety, passenger comfort, cooling systems and heat exchangers and minimizing noise. In recent years the increased pressure ...
H-Point Machine and Head Restraint Measurement Device Positioning Tools – Extended Capabilities
B. Walker, L. Cowlam, J. Dennis (Arup)
S. Albery, N. Leblanc (Futuris)
The H-point of a seat is an important parameter for in the design process of a vehicle, and in particular the design of a seat. This can be estimated empirically, but this method is usually not sufficient to accurately determine how the manikin’s position is affected by subtle yet complex interactions within the seat and its trim. To aid this process, Arup have developed a positioning tool kit for use in conjunction with the Oasys PRIMER ...
Hail Impact Problem in Aeronautical Field
A. Prato, M. Anghileri, L. Castelletti (Politecnico di Milano)
Crashworthiness is one of the aspects that must be taken into account till the design phase, especially in aeronautical field. Some bodies, impacting against structures, can be considered as soft body. Soft bodies are highly deformable and flow over the structure spreading the impact load. Among them, hail impact can be considered as one of the most dangerous event during the operative life of aircrafts.
Highly Advanced M&S System for Marine Accident Cause Investigation using FSI Analysis Technique
S. Lee (Korea Maritime and Ocean University)
Investigation of marine accident causes usually depends on the judgments of maritime experts, based on the statements of the concerned persons in the case where there is no navigation equipment, such as AIS and VDR. Scientific verification also has a limitation in the case of their conflicting statements. It is necessary to develop a highly advanced Modeling & Simulation (M&S) system for the scientific investigation of marine accident causes and ...
HPC Manufacturing White Paper.pdf
HPC on the Cloud: Gompute Support for LS-DYNA Simulations
I. Fernandez, R. Díaz (Gridcore)
Gompute delivers comprehensive solutions for High Performance Computing, in-house, in the cloud or both. With over 10 years’ of experience providing solutions and services to the Engineering communities, Gompute delivers a collaborative and productive infrastructure to either manage your HPC environment or burst out into the Gompute data center , ranging from 1 > 1000’s of cores. Keywords: Cloud Computing, LS-Dyna on demand, HPC simulations, ...
Impact Simulations on Home Appliances to Optimize Packaging Protection: A Case Study on a Refrigerator
D. Hailoua Blanco, A. Ortalda (Engin­soft)
F. Clementi (Electrolux Italia)
Numerical simulations were used to investigate the impact behavior of complex products such as home appliances. LS-DYNA® is a powerful tool for performing repeat analysis of large assembled parts of the final product, including the packaging. The main goal of the simulations was to verify the performance and suitability of the packaging and its interaction with the structure in case of damage occurring during transportation or delivery. The ...
Implementation of Peridynamic Theory to LS-DYNA for Prediction of Crack Propagation in a Composite Lamina
T. Kahraman (MAN Turkey/ TOBB University of Economics and Technology)
U. Yolum, M. A. Guler (TOBB University of Economics and Technology)
Composite materials are commonly used in aerospace and automotive industry due to their high specific strengths. However, damage tolerance assessment of composite parts is done experimentally since there is no single criterion that is capable of predicting all of the failure modes. Thus numerical estimation of crack propagation in composite structures has been considered as an important research topic in academia and especially in aerospace ...
Improvement of Domain Decom­position of LS-DYNA R7 and R8
M. Makino (Dynapower)
The domain decomposition is important for get the good performance by mpp version. The calculation of ls-dyna is mainly two parts; element calculation and contact calculation. For element calculation, ls-dyna can distribute the elements equally based on the cost evaluation. Until r6, the cost for solid element was not correctly treated, but r7, the cost of element including the solid element are re-evaluated.
Improvements to LS- DYNA Implicit Mechanics
R. Grimes (LSTC)
LSTC is continually improving the capabilities and performance of Implicit especially in the distributed memory computing environment. This talk will review recent improvements such as (a) removing serial memory restrictions with a new matrix ordering algorithm, (b) reusing the matrix ordering when the matrix structure has not changed from the previous factorization (c) general improvements to performance of the numerical factorization. We will ...
Improving Robustness of Chevrolet Silverado with Exemplary Design Adaptations Based on Identified Scatter Sources
D. Borsotto (Sidact)
The investigations described here are related to the unstable behavior of crash-simulations due to minor changes in the model. As a consequence the received simulation results become in some way unpredictable, whereby the causes can be various: e.g. modeling failure, contact issues, numerical instabilities, physical instabilities, etc
Increasing Efficiency of the Design Process with an Isogeometric Analysis Plugin for Siemens NX by Analyzing the CAD Model Directly
M. Breitenberger, B. Philipp, R. Wüchner, K.-U. Bletzinger (Technical University Munich)
S. Hartmann, A. Haufe (DYNAmore)
The bottleneck for today’s integrated CAD and CAE tools or for the design-through-analysis process in general is the fact that for each product at least two different geometry representations are used. On the one hand side there is the CAD model and on the other hand side there is the finite element mesh, both representing the same object. The conversion between CAD model and FE model are named meshing and CAD reparameterization, respectively. ...
Influence of Variations in a Mechanical Framing Station on the Shape Accuracy of S-Rail Assemblies
K. Wiegand, T. Konrad, (Daimler)
M. Merklein (University of Erlangen-Nürnberg)
In virtual production planning, recent publications showed the possibility of creating a digital process chain of body parts including the process steps in the press shop and body-in-white shop. The digital process chain is used to get an early impression of the shape accuracy of assemblies regarding the used single parts. Within the entire process chain a huge variety of factors influence the shape accuracy of (sub)assemblies. However, not ...
Investigation of Seat Modeling for Sled Analysis and Seat Comfort Analysis with J-SEATdesigner
N. Ichinose, H. Yagi (JSOL)
Recently vehicle model is becoming more detailed and complex. Due to refinement of vehicle model, automotive companies are demanding to directly evaluate dummy injury criteria in crush analysis. To evaluate injury criteria, more detailed seat model is needed, because injury criteria are highly depending on seat structure and restraint system. Seat structure consists from metal frame, foam pad, covering fabric and complex mechanism.
Isogeometric Analysis in LS-DYNA: Using CAD-Geometry for Numerical Simulation
Prof. D. Benson (University of California)
D. Bhalsod, P. Ho, L. Li, W. Li, A. Nagy, I. Yeh (LSTC)
S. Hartmann (DYNAmore)
In the last decade numerous research has been done in the area of Isogeometric Analysis (IGA). The intention of this rather new technology is the wish to have a stronger integration of Computer Aided Design (CAD) and Finite Element Analysis (FEA). Its basic idea is to use the same mathematical description for the geometry as well in the design process (CAD) as in the later analysis (FEA). One of the wide spread geometry description methodology ...
Joint Analytical/Experimental Constitutive and Failure Model Development
P. Du Bois (Consultant); J. Seidt (Ohio State University)
Keep the Material Model Simple with Input from Elements that Predict the Correct Deformation Mode
Prof. T. Tryland (Sintef Raufoss Manufactu­­ring)
T. Berstad (Norwegian University of Science and Technology)
The 64 km/h frontal offset test is run with a deformable barrier, and the first numerical model of this barrier was made with solid elements to represent the honeycomb blocks. However this required development of a special element formulation to handle the severe deformation of the solid elements together with a special material model that could be calibrated to handle the extreme anisotropy. It is herein important to notice the amount of work, ...
Lenovo Solution for Engineering Analysis.pdf
LS-DYNA Air Blast Techniques: Comparisons with Experiments for Close-in Charges
L. Schwer (Schwer Engineering)
H. Teng (LSTC)
M. Souli (University of Lille)
Numerical simulations used to predict events are always challenging. Among the challenges is establishing some basis for confidence in the results when no experimental results exist, i.e. a prediction.
LS-DYNA Model Development of the Harmonized Hybrid III 05F Crash Test Dummy
C. Shah (Humanetics Innovative Solutions)
C. Kleeßen, R. Kant, P. Lemmen (Humanetics Europe)
Starting per January 2015 Euro NCAP requires use of the HIII-5th percentile small female for its full width frontal barrier test procedures. The dummy should be according to the latest agreed FTSS / Denton brand harmonization and thereby eliminates brand variability effects. The dummy configuration includes a neoprene neck shield, the SAE harmonized jacket (SAE J2921) and the Denton lower leg cavities. In addition, the thorax pendulum ...
LS-DYNA Model Development of the THOR-M
I. Maatouki, P. Lemmen (Humanetics Europe)
Z. Zhou (Humanetics Innovative Solutions)
Developments on the THOR dummy over the past years resulted in the THOR-M version which is foreseen for introduction into regulatory and Consumer tests in the 2020 timeframe. NHTSA considers to use the THOR-M dummy in an angled impact test while Euro NCAP includes plans for the development of a frontal barrier test with THOR-M in their roadmap for 2020. To support the development of restraint systems for both test configurations Humanetics is ...
LS-TaSC Product Status
K. Witowski, P. Schumacher (Dynamore)
W. Roux (LSTC)
The LS-TaSC Version 3.1 topology and shape design tool is presented. The presentation introduces the multi-point numerical derivatives scheme that allows constrained optimization using the mass fractions and load case weights as variables. This allows constrained optimization using any response or mathematical expressions as constraints or objectives.
Machine Learning Approaches for Repositories of Numerical Simulation Results
Prof. J. Garcke, R. Iza Teran (Fraunhofer SCAI)
Simulations are used intensively in the developing process of new industrial products and have achieved a high degree of detail. In that workflow often up to thousand finite element model variants, representing different product configurations, are simulated within a few days. Currently the decision process for finding the optimal product parameters involves the comparative evaluation of large finite element simulation bundles by post-processing ...
Macroscopic Modeling of Flow Drill Screw Connections
J. K. Sønstabø, D. Morin, M. Langseth (Norwegian University of Science and Technology)
Flow-drill screws (FDS) are used in the automotive industry to join parts in the load-bearing structure of cars. The process is a simple one-step procedure, which requires access only from one side of the assembly, and a variety of dissimilar materials may be joined. As it is easy to automate, the FDS technology is well suited for the production lines in the automotive industry.
Macroscopic Modeling of Flow-Drill Screw Connections
J. K. Sønstabø, D. Morin, M. Langseth (Norwegian University of Science and Technology)
In the last decades, the use of polymeric materials in the automotive industry has increased dramatically. This demand is linked to the good ratio between cost, density and mechanical properties for this class of materials . Moreover, injection modelling allows a very large range of shapes for the polymeric parts used in a car body. This combination of advantages makes polymers an ideal choice for automotive applications such as interior body ...
Making HPC Accessible for SMEs
A. Wierse (Sicos BW)
Numerical computation, often also named simulation, plays nowadays in many enterprises an important role in the development process. Especially in large companies in the automotive or aerospace industry it is actually impossible to develop a new product without simulation technology. In recent decades the necessary know-how and personnel has been built up, but there have also been and will be significant investments into the infra structure. ...
Mechanical Response Modeling of Different Porous Metal Materials
Prof. M. Vesenjak, M. Borovinšek, A. Kovačič, M. Ulbin, Z. Ren (University of Maribor)
Porous metals have been increasingly used in modern engineering applications over the past decades due to their multi-functionality and attractive combination of mechanical and thermal properties [1]. The understanding of their mechanical behaviour is of crucial importance for their use in engineering applications.
Meta-Model Based Optimization of Spot-welded Crash Box using Differential Evolution Algorithm
A. Serdar Önal, Beyçelik Gestamp Kalip ve Oto Yan San. Paz ve Tic.)
N. Kaya (Uludağ University)
Micro-Meso Draping Modeling of Non-Crimp Fabrics
O. Vorobiov, T. Bischoff, A. Tulke (FTA Forschungsgesellschaft für Textiltechnik Albstadt)
Composite materials with textile reinforcements are showing rapid growth of integration in aerospace, automotive, sport and other industrial sectors. Especially non-crimp fabrics (NCF) are widely spread because of their high drapeability and good in-plane mechanical properties in main fibre directions. For prediction of mechanical response of composite parts in particular with high curvature it is important to consider the local orientations and ...
Model Based Design of Pressure Profiles for Pyrotechnic Actuator using SPH Method & LS-OPT Solution
E. Kantor, Y. Lev (Rafael)
Pyrotechnic Pistons are communally used as fast reacting actuators in many elds and applications, such as seat belt pretensioners, wire and cable cutters and power disconnect devices. The design of such devices is subjected to many unknowns and the design methodology sometimes consists of many experiments in a trial & error methodology. This paper presents the design process of such a device. In this work a MBD process was applied using LsDyna® ...
Model Reduction Techniques for LS-DYNA ALE and Crash Applications
K. Kayvantash, A.-T. Thiam (CADLM)
S. B. Chaabane, J. Touzeau (Silkan)
Model Reduction Techniques (MRT) are algebraic approximation solutions allowing for fast (real- time) interpolations (reconstruction) or extrapolations (prediction), based on previously existing DOE-type results, obtained either from FE computations or directly from constructions of reduced FE solutions. In a sense reduced models are subsets or decomposed domains of the solutions allowing for reconstruction of all spatial or temporal domain ...
Modeling Adhesively Bonded Joints with *MAT252 and *MAT_ADD_COHESIVE for Practical Applications
F. Burbulla (Dr. Ing. h.c. F. Porsche)
A. Matzenmiller, U. Kroll (University of Kassel)
The new material model *MAT_TOUGHENED_ADHESIVE_POLYMER ( *MAT_252 ) has been developed at the Institute of Mechanics of the University of Kassel [1], [2] and become available for the use with solid elements since LS-DYNA R7.1.1 . The theoretical framework of the model equations is based on continuum and damage mechanics in order to predict the complex mechanical behaviour of crash optimized ...
Modeling Non-Isothermal Thermoforming of Fabric-Reinforced Thermoplastic Composites
D. Schommer, M. Duhovic, J. Hausmann (University of Kaiserslautern)
The correct modeling of the sheet forming of fabric reinforced thermoplastic composites, so called organosheets, is still a challenge. In the past it was possible to predict accurately and efficiently the fiber orientation during the draping of dry reinforcement or constant temperature organosheet (reinforcement and molten polymer) using the explicit FEM-Software LS-DYNA®. Until now, the developed model was only able to simulate the right ...
Modeling of Ballistic Impact of Fragment Simulating Projectiles against Aluminum Plates
T. Fras, L. Colard, B. Reck (French-German Research Institute of Saint-Louis)
In this paper, the ballistic impact test is described in which fragment simulating projectiles (FSPs) have been used against thick plates made of an aluminum alloy. To perforate the plates, the projectiles must have reached velocities higher than 890m/s.
Modeling of Self-Piercing Riveted Joints for Crash Simulation – State of the Art and Future Topics
M. Bier, S. Sommer (Fraunhofer IWM)
The requirements for energy efficiency and lightweight construction in automotive engineering rise steadily. Therefore a maximum flexibility of different materials is necessary and new joining techniques are constantly developed. The resulting large number of joints with different properties leads to the need to provide for each type of joint an appropriate modeling method for crash simulation.
Modeling of Strain-Rate Dependence of Deformation and Damage Behavior of HSS- and UHSS at Different Loading States
A. Trondl, D. Sun (Fraunhofer IWM)
The predictive capability of crash simulation concerning material failure is still in need of improvement due to the coupled complex influences of triaxiality, strain rate and temperature. Because of their lower ductility the use of high- and ultra high strength steels (HSS&UHSS) requires a more accurate prediction of failure. This subject commonly leads to more complicated material- and failure models to describe complex interactions between ...
Modeling of Thick UD Composites for Type IV Pressure Vessels
R. Matheis, H. Murnisya (fka Aachen)
T. Johansson (DYNAmore Nordic)
Increasing energy costs, limitation of crude oil resources as well as constantly intensifying emission targets (especially w.r.t. CO 2 ) are a pivotal driver for current automotive research and development.
Modeling the Behavior of Dry Sand with DEM for Improved Impact Prediction
S. Sridhar, S. K. Vishwakarma (Whirlpool of India)
Pumpkin ball impact test is similar to simple pendulum impact test. It represents a rough handling test conducted on user interface parts to check its robusteness in case of abuse loading. The objective of this work is to create a standard simulation model that would capture the behavior of sand particles inside a rubber ball and scope is limited to create and validate a finite element model used to replicate a pumpkin ball impact test. Pumpkin ...
Modeling the Press Hardening Process
Prof. M. Oldenburg (Luleå University of Technology)