3rd European LS-DYNA Conference
Paris, 2001
- IN BORE BEHAVIOUR OF LARGE CALIBRE ARMOUR PIERCING FIN STABILISED DISCARDING SABOT PROJECTILES.
- The efficiency of large calibre armour piercing fin stabilised discarding sabot projectiles (APFDS) is primarily linked to their terminal ballistics performances. But other parameters, such as its accuracy and its yaw at the impact have also a large influence on the performance. These two parameters magnitude, as well as the survivability of the projectile during the launch phase are greatly affected by the interaction between the projectile and ...
- NUMERICAL SIMULATION OF THE WOOD RESPONSE TO THE HIGH VELOCITY LOADING .
- The experiments where the freely supported spruce beams have been loaded by the detonation of an explosive charge have been evaluated using of the numerical simulation. The explicit Lagrangean finite element code LS DYNA 3D has been used to analyse the beam response. The wood has been considered as global orthotropic linear elastic material with a material damage. The material damage has been described by the strain at the wood failure. This ...
- THE GENERATION OF A MATERIAL MODEL TO REPRESENT THE MECHANICAL BEHAVIOUR OF AN ALIPHATIC POLYETONE (CARILON EP) AT HIGH STRAIN RATE EVENTS AND LOW TEMPERATURES.
- Although explicit finite element codes have been used for many years to predict the impact performance of plastic components, there are few papers that detail how the constants for material models were determined and the resulting models validated with experimental test results. Aliphatic polyetone materials appear very attractive materials for the developers of automotive fuel systems. This is principally due to their low fuel permeability and ...
- AN EXPERIMENTAL AND NUMERICAL STUDY ON THE ENERGY ABSORBING CAPABILITY OF ALUMINUM EXTRUSIONS UNDER OBLIQUE LOADING
- Oblique loading was studied through static experiments and numerical simulations. The behavior of square aluminum columns in alloy AA6060 subjected to oblique loading was investigated experimentally for three different load angles. The square columns were clamped at one end and oblique load conditions were realized by applying a force with different angles to the centerline of the column. Numerical simulations were later carried out to validate ...
- CHARACTERIZATION AND COMPONENT LEVEL CORRELATION OF ENERGY ABSORBING (EA) POLYURETHANE FOAMS (PU) USING LS-DYNA MATERIAL MODELS
- Polyurethane (PU) foams are one of the most widely used countermeasures for head impact protection. For accurate prediction of the head injury parameters, studies were conducted to establish a reliable LS-DYNA[1] material model to characterize PU foams. A 5.0pcf (80.09 g/l) PU foam was characterized using four different material models available in LS-DYNA for simulating foams, namely MAT_LOW_DENSITY_FOAM (MAT57), MAT_CRUSHABLE_FOAM (MAT63), ...
- CRASH-SIMULATION OF HAT-SECTIONS RELIABILITY OF THE NUMERICAL MODEL
- DEVELOPMENT AND VALIDATION OF A US SIDE IMPACT MOVEABLE DEFORMABLE BARRIER FE MODEL
- Automotive safety regulations vary in different parts of the world. Dynamic side impact regulations, for example, are different than the ones in Europe. United States National Highway Traffic Safety Administration (NHTSA) and the European Union (EU) have each produced their own distinct testing procedures such as different deformable barriers, impact configurations and anthropomorphic test devices (dummies). Although both test procedures have ...
- EFFECTIVENESS OF COUNTERMEASURES IN RESPONSE TO FMVSS 201 UPPER INTERIOR HEAD IMPACT PROTECTION
- Analysis and development of countermeasures in meeting vehicle upper interior free motion headform (FMH) impact safety requirement (FMVSS 201) has become an important aspect for engineers. FMVSS 201 safety regulation stipulates that the Head Injury Criterion, HIC (d) should be less than 1000 when a FMH is impacted at a speed of 15 mph. The interior components of a vehicle generally do not generate high HIC (d) numbers by themselves but the steel ...
- ESTIMATION OF THE TRANSVERSE CRUSH RESISTANCE OF A SECTION OF THE T23 FRIGATE
- Ocean-going vessels are very complex structures, and can have displacements ranging from hundreds to tens of thousands of tons. In the case of bulk carriers and tankers, this can be as much as half-a-million tons. When in motion, they can possess very large amounts of kinetic energy even if their velocities are small. They therefore have the potential to cause serious damage in case they are involved in a collision. Ships moving in ports or ...
- FINITE ELEMENT ANALYSIS OF DUCTILE FAILURE IN STRUCTURAL STEEL SUBJECTED TO MULTIAXIAL STRESS STATES AND HIGH STRAIN RATES
- Notched specimens of the structural steel Weldox 460 E have been tested at high strain rates in a Split Hopkinson Tension Bar. The aim was to study the combined effects of strain rate and stress triaxiality on the strength and ductility of the material. It is further considered important to obtain experimental data that may be used in validation of constitutive relations and fracture criteria. The force and elongation of the specimens were ...
- IMPROVING THE IMPACT RESISTANCE OF MASONRY PARAPETS
- There are over 60000 masonry bridge parapets in the UK. Whereas steel and concrete parapets are well covered by design standards masonry parapets are not. Initially LS-DYNA was used to model vehicle impacts on various forms of masonry parapet. The results were encouraging, with good qualitative agreement between tests and analysis. The same finite element modelling strategy was subsequently used to help develop a guide for assessment (County ...
- LS-DYNA PERFORMANCE ON ULTRASPARCTM -III SERVERS AND WORKSTATIONS
- Sun Microsystems recently announced a new line of high-performance Sun FireTM Midframe servers and Sun BladeTM 1000 workstations based on 750-MHz UltraSPARC-III microprocessors. These new computers offer exceptional performance for numerically intensive MCAE applications at reasonable prices. This paper presents single- and multi-processor performance and scalability results of LS-DYNA running on these systems. Results of both OpenMP and MPI ...
- Modelling of an automobile tyre using LS-DYNA3D
- This paper describes a finite element model used to investigate the quasi-static behaviour of a stationary automobile tyre vertically loaded against a stiff horizontal surface. The model includes a representation of the tyre, a steel wheel and surface. The tyre is represented in detail by a number of tyre components, the wheel and surface are coarsely modelled. LS-DYNA3D is used to simulate the inflation of the tyre, the fit between the tyre ...
- NUMERICAL SIMULATIONS OF DUCTILE FAILURE IN EXTRUDED ALUMINIUM ALLOYS USING A COUPLED MODEL OF ELASTO-PLASTICITY AND DAMAGE
- A test programme has been carried out to establish the mechanical properties of three extruded aluminium alloys. The investigated alloys exhibited significant anisotropy in strength, plastic flow and ductility. The anisotropy is mainly due to crystallographic texture, and an anisotropic yield criterion is needed to describe the mechanical behaviour. Several yield criteria were evaluated against the experimental data. The yield criterion Yld96 ...
- ON TECHNIQUES FOR SIMULATING EFFECTS OF CAVITATION ASSOCIATED WITH THE INTERACTION BETWEEN STRUCTURES AND UNDERWATER EXPLOSIONS USING LS-DYNA
- In this paper, a two-step technique is suggested to reduce the reflection of shock waves from a truncated boundary without significantly smearing the incident shock wave and to suppress spurious oscillations without significantly affecting accuracy. By comparing the results for a one-dimensional case with a wellknown analytical solution, it is shown that the technique works very well.
- PARALLEL ENGINEERING SIMULATIONS BASED ON FORMING SIMULATION OF A HEAT EXCHANGER PLATE
- Normally, simulation regarding computational fluid dynamics (CDF), structural mechanics and heat transfer simulations in sheet metal applications are made without a forming simulated part. Instead the simulation is based on especially constructed parts, with some kind of nominal geometry, only for the specific simulation. This paper presents the use of sheet metal forming simulation of an advanced thin sheet metal part as input to other ...
- SIMULATIONS OF HYPERVELOCITY IMPACTS WITH SMOOTHED PARTICLE HYDRODYNAMICS
- This paper is devoted to the results of Smoothed Particle Hydrodynamics (SPH) simulations of high velocity impacts on thin aluminium plates using LS-DYNA computer code. The numerical results of the damage produced on plates are compared with experimental data. Two simulations are presented : - An aluminium sphere impacting an aluminium plate at 6.64 km/s - A steel sphere impacting an aluminium plate at 5.53 km/s Experimental and numerical ...
- SOME EXAMPLES OF ENERGETIC MATERIAL MODELLING WITH LSDYNA
- SNPE is using DYNA codes for more 15 years for characterisation and modelling of energetic materials : high explosives, solid propellants, gun propellants and pyrotechnic systems for functioning, safety, survivability and vulnerability analysis in space and defence applications. This paper presents some examples of the use of LSDYNA in the field of solid mechanics, fluid mechanics and detonics. The first example concerns the development of a ...
- WEB-CENTRIC LS-DYNA
- The Internet has changed the way business is done – and High Performance Computing (HPC) is no exception. Many firms have launched “dot-com” software to facilitate B2B collaboration, outsource jobs, provide engineering services, or exchange data with suppliers and partners. Recently, however, hundreds of dot-coms have failed, and many high-tech companies have laid off thousands of workers. Now what? The term ASP (application service provider) ...
- 3rd European LS-DYNA Conference
- QUASI-STATIC LIMIT LOAD ANALYSIS BY LS-DYNA IN COMBINATION WITH ANSYS
- It is shown when and how quasi-static limit load analyses can be performed by a tran-sient analysis using LS- DYNA. Then we focus on the remaining benefits of implicit analysis and how a proper combination of ANSYS and LS-DYNA can be used to prepare the transient analysis by common preprocessing and static analysis steps. Aspects of discretization, solution control, consideration of imperfections and methods of checking the results are ...
