Crash-boxes based on elastic cement&rsquo;s multi-stage radial flow and crushable cylindrical-corrugated components

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (3) : 14-21.

Crash-boxes based on elastic cement’s multi-stage radial flow and crushable cylindrical-corrugated components

LI Zhuqiang1 LIAO Changrong1 FU Benyuan1 ZHANG Peng1 JIAN Xiaochun2

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Abstract

A basic problem is energy absorption degradation of conventional automotive crash-boxes due to Euler instability. Here, a novel crash-box based on the combined action of elastic cement’s multi-stage radial flow and crushable cylindrical-corrugated components was proposed. Oswald-deWaele fluid constitutive model was employed to characterize the rheological properties of elastic cement, the model parameters were determined through tests. Through dropping-hammer impact tests, impact force transfer characteristics of crushable cylindrical-corrugated components were studied. The continuity equation and governing differential equation of elastic cement in multi-stage radial flow were established. With Oswald-deWaele model, the expressions for elastic cement’s radial velocity distribution at different radial positions and pressure gradient were deduced. The influence of inertia effect on pressure gradient was analyzed based on the average inertia method. Further, the calculation method of buffer force during elastic cement unsteadily flowing in the crash-box was obtained. In order to verify the rationality of the theoretical calculation, the crash-box prototype was designed, fabricated and assembled, and a dropping-hammer test system was constructed for impact tests under two different heights. The impact forces obtained with tests and those calculated with the theoretical method were compared, and the caused errors were analyzed.

Key words

elastic cement / crash-box / Oswald-deWaele fluid / inertia effect

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LI Zhuqiang1 LIAO Changrong1 FU Benyuan1 ZHANG Peng1 JIAN Xiaochun2. Crash-boxes based on elastic cement’s multi-stage radial flow and crushable cylindrical-corrugated components[J]. Journal of Vibration and Shock, 2018, 37(3): 14-21

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