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Crush Structures for Attenuating Impact Induced Accelerations

T.  J. REDDY, V. NARAYANAMURTHY, Y. V. D. RAO

Abstract


Thin-walled structural members called as crush structures are generally employed in the frontal compartment of road vehicles for absorbing the impact energy by axial mode of plastic deformation which is widely accepted. However, most members demonstrate high initial peak crush forces with equivalent decelerations far above the statutory acceptable limits, low crush force efficiency (CFE) and low stroke efficiency (SE) which affect the overall crashworthiness of the vehicle. This paper proposes few new thin-walled structural configurations with precise distribution of axial stiffness based on numerical procedures. The proposed structural members are aimed at achieving initial peak crush force within acceptable levels of accelerations and improved stroke and crush force efficiencies under pure axial impact. Crashworthiness of these deformable members on various quantifiable parameters is thoroughly investigated and discussed with a recommendation for the best energy absorbing member configuration. The proposed members are made of stainless steel SS304.


DOI
10.12783/ballistics2019/33291

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