Session: 02-10-02 Collision and Crashworthiness 2

Paper Number: 78746

78746 - Numerical Investigations on Plastic Responses of Strain-Rate Sensitive Panels Under the Lateral Impact 

In the present study, the influence of the stiffening effect of material strain rate sensitivity on the lateral impacted stiffened panels is investigated. Numerical simulations of low-velocity impact tests examining dynamic responses of clamped stiffened panels struck transversely by an impact block with a parabolic-shaped indenter are presented. Rigid-plastic analyses for mass impact, which consider strain rate sensitivity and strain hardening, are conducted. Experimentally obtained dynamic force-displacement responses are compared to reveal the influence of dynamic material characteristics on the impact behavior of steel plates. The great consistency between simulation results, predictions of the rigid-plastic analysis, and experimental results illustrates that the proposed rigid-plastic methods are effective to solve the collision problem taken strain rate sensitivity into account. The quantitative results for the effect of the strain rate sensitivity are given. A linear relationship is suggested to characterize the material strain rate sensitivity through the dynamic flow stress, defined by introducing a related factor based on numerical analysis of results for the stiffening effect of strain rate sensitivity. Moreover, the influence of the material strain rate effect on the plastic displacement of stiffened panels is described. The permanent plastic displacement is confirmed to be inversely proportional to the related factor.

Presenting Author: Hongyu Zhou Shanghai Jiao Tong University

Authors:

Hongyu Zhou Shanghai Jiao Tong University
Deyu Wang Shanghai Jiao Tong University