scholarly journals Computer Simulations of Contact Forces for Airbags with Different Folding Patterns During Deployment Phase

1995 ◽  
Vol 2 (3) ◽  
pp. 237-245
Author(s):  
King H. Yang ◽  
Yun-Qiang Li ◽  
Danyu Sun
Keyword(s):  
Shear Force ◽  
Contact Forces ◽  
Neck Flexion ◽  
Explicit Finite Element Method ◽  
Explicit Finite Element ◽  
Great Caution ◽  
Axial Forces ◽  
Hybrid Iii ◽  
Flexion Moment ◽  
Automobile Crash

An explicit finite element method was used to study the neck load and the contact force between an occupant and an airbag during an out-of-position frontal automobile crash. Two different folding patterns and two different mounting angles of the airbag were simulated. For the four cases simulated, the occupant’s neck axial force ranged from 156 to 376% of the data obtained from in-position sled tests using the Hybrid III dummy. The neck shear force ranged from 87 to 229% and the neck flexion moment ranged from 68 to 127% of in-position experimental results. In both 300 mounting angle simulations, the neck axial forces were higher than that of the two simulations with 00 mounting angles, but the trend for the neck shear force was the opposite. Although the kinematics of the model appear reasonable, the numbers generated by the model must be reviewed with great caution because the model has not been fully validated.

Contact Force Simulation of Granular Media Using Explicit Finite Element Method

2008 ◽  
Author(s):  
M. A. Kabir ◽  
C. F. Higgs ◽  
M. R. Lovell
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Granular Media ◽  
Flow Behavior ◽  
Tangential Force ◽  
Food Service ◽  
Contact Forces ◽  
Explicit Finite Element Method ◽  
Explicit Finite Element ◽  
Element Method

Granular flow behavior is of fundamental interest to the engineering and scientific community because of the prevalence of these flows in the pharmaceutical, agricultural, food service, and powder manufacturing industries. When granular media come under external load, inter-particle forces in the granular media form an inhomogeneous distribution. In this study, a simulation of the contact forces in granular media was carried out using an explicit finite element method on a biaxial cell of approximately 2500 particles. Some of the key results included the capturing of normal force and tangential force distributions within a granular shear cell.

The Study on Crashworthiness Performance of Thin-Walled Structures and the Effect of Welding Performance on it

2011 ◽  
Vol 63-64 ◽  
pp. 655-658
Author(s):  
Qi Hao ◽  
Sheng Jun Wu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Welded Joints ◽  
Impact Force ◽  
Deformation Energy ◽  
Optimal Shape ◽  
Explicit Finite Element Method ◽  
Explicit Finite Element ◽  
Thin Walled Structures ◽  
Thin Walled

Explicit finite element method is adopted to simulate the crashworthiness performance of four types of typical thin—walled structures used in vehicle by software LS-DYNA. The structures with the same material、area and length are crash by a rigid body with 40km/h in10ms, The crash processes and crashworthiness characters are analyzed by a series crash parameters: deformation energy with unit displacement, impact force and deceleration to look for the optimal shape with crashworthiness. With comparing, the double caps section has ascendant performance than the others. The simulating methods of welded-joints are discussed to analysis their effects on crashworthiness simulation.

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