关键词: 弹塑性, 倾斜冲击, 冲击持时, 永久变形, 滑移长度

Abstract: For the design and applications of mechanical systems, the elasto-plastic contact impact phenomenon among the multi-body surfaces was one of the key mechanics problems, which contained complex physical and mechanics properties. There still were many controversies and mysteries regarding the analysis and characterization of key parameters such as contact force. For the elasto-plastic oblique contact-impact events, the calculated formulas of instantaneous contact forces and contact deformations were established based on the Brake indentation model, and the elasto-plastic contact impact process from the contact deformations was described systematically in detail. The internal relationship among impact duration, permanent deformation and sliding length was analyzed analytically based on the generalized momentum theorem, and the permanent deformations and sliding lengths expressed in the integral form were obtained respectively, and then, combined with testing data for the motions of the impact objects before and after contact impact reported in literatures, the analytical solution was obtained. The deformation region of the impacted object after the contact impact was measured, and the comparative analysis was also performed. The experimental and numerical results show that the calculated results of the permanent deformations and sliding lengths solved by using the approach developed by the generalized momentum theorem are found to be in good agreement with the experimental data. And this approach yields more accurate results compared to the direct integration of mathematical equations using the Brake indentation model.

Key words: elasto-plastic, oblique impact, impact duration, permanent deformation, sliding length