Modeling of Crashworthiness in Energy Absorbent Shells with Discontinuities

Authors

1 Aerospace engineering department, Mechanical department, Tarbiat modares university, Tehran, Iran

2 Associate Professor of aerospace engineering department, Mechanical department, Tarbiat modares university, Tehran, Iran

Abstract

The importance of research in crashworthiness and the post-accident behavior and efforts to improve the behavior of the structure and reduce the accelerations to the occupants with the help of energy absorbers is determined by observing the increasing statistics of vehicle accidents, including cars, trains, and airplanes. In this research, the energy-absorbing behavior of a thin wall with an aluminum rectangular section will be investigated by numerical solution in finite element method and in Abaqus software, and to improve its energy absorption parameters, discontinuities were created on the geometry, which regularized the folding pattern. The primary research approach is to improve the energy absorption behavior without fundamentally changing the geometry. Discontinuities with different geometrical shapes, sizes, and numbers are placed in different places in the model to obtain the best energy absorption behavior. After evaluating and choosing the circular discontinuity among the other geometric shapes, for their proper placement, an initial guess of the location of the discontinuities was considered with the help of similar research. Then, the eigenvalues of the geometry extracted from the buckling solver have been used to place and increase the number of discontinuities.
Finally, by examining 43 models with different numbers and placement of discontinuities, a model with a 13% improvement in the CFE criterion was proposed.

Keywords

Main Subjects

References

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Journal of Solid and Fluid Mechanics
Volume 13, Issue 6
January and February 2024
Pages 1-15

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