Theoretical analysis on thin-walled holed circular tubes under axial loading

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (2) : 141-147.

YAO Ruyang1,ZHAO Zhenyu2,YIN Guansheng1, ZHANG Bei3

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Abstract

The investigation of axial crashworthiness of thin-walled holed circular tubes is helpful for their wide application in buffering and energy absorption fields.By considering the energy absorption behaviors of holed and unholed regions respectively and introducing the strain-hardening effect of material, a theoretical model for the axisymmetric mode of a holed circular tube under axial crushing was proposed based on the plastic hinge method.The expressions for bending strain energy, stretching strain energy, mean crushing force and specific energy absorption were deduced.The results show that the theoretical predictions agree well with the experimental and simulation results; the normalized mean crushing force increases obviously with the decrease of the half-fold slenderness ratio; the effect of the hole number in each row on the normalized mean crushing force decreases with the increase of the wall thickness of tube or the decrease of hole radius.The specific energy absorption increases with the decrease of the hole number in each row or the reduction of hole radius.

Key words

thin-walled structure / holed circular tube / axial crashworthiness / crushing force / specific energy absorption

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YAO Ruyang1,ZHAO Zhenyu2,YIN Guansheng1, ZHANG Bei3. Theoretical analysis on thin-walled holed circular tubes under axial loading[J]. Journal of Vibration and Shock, 2020, 39(2): 141-147

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