Elastic-plastic dynamic buckling criterion of rods under axial impact
LIU Sai1,ZHANG Weigui2, XIAO Kai1,SU Ling1,WANG Yue1
Author information+
1. China Academy of Launch Vehicle Technology, Beijing 100076, China;
2. Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing 100094, China
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History+
Received
Revised
Published
2018-02-23
2018-07-13
2019-09-28
Issue Date
2019-09-28
Abstract
In order to propose an elastic-plastic dynamic buckling criterion for satisfying engineering requirements of beam and rod structures and simplifying measurement method, taking elastic-plastic dynamic buckling of a micro-bow flat long metal rod under axial weight impact as an example, dynamic responses of the rod under different axial impact velocities were analyzed with the explicit dynamic finite element simulation analysis method to generalize an elastic-plastic dynamic buckling criterion. Using this criterion, relations among initial condition parameters of the flat long rod including material yield stress, deflection and cross-section size of prefabricated micro-bow shape, etc. and critical impact velocity were further studied to verify the universality and effectiveness of the criterion. After investigation, the rod dynamic buckling criterion under action of axial impacts, i.e., the loading-separation criterion was proposed, it was described that if a rod is loaded by weights in axial direction, as soon as an obvious separation between its loaded end and weights happens, it enters dynamic buckling. It was shown that the loading-separation criterion can satisfy engineering requirements; compared with Budiansky-Roth (BR) motion criterion based on load-response curve, the measurements for physical variables involved to this criterion are easier and simpler; compared with enhancing material strength and improving machining accuracy of the flat long rod, increase in its cross-section size is more effective to lift its dynamic buckling strength.
LIU Sai1,ZHANG Weigui2, XIAO Kai1,SU Ling1,WANG Yue1.
Elastic-plastic dynamic buckling criterion of rods under axial impact[J]. Journal of Vibration and Shock, 2019, 38(19): 144-148
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