强冲击载荷下可滑移界面的基本特性研究

Elastic contact, limit of elastic eformation and full plasticcontact ependent on strain, strain-rate andtemperature areconsidered in the resented description of normal interface.response to oblique impact. A simplified approach to interfaceinstability under high stain-rate stretching is presented andthe effects of constitutive models on the instability areindicated.2) An ffective friction coefficient in impact process is definedas the ratio of the effective tangential friction force to the.normal load at each instant. The effective friction force isexpressed as a ombination of shearing term and ploughing termwhich are dependent on the state of shearing the metallicjunctions by slip or stick and the state of dragging thematerial from the ront of the particle, respectively.3) The total adhesive friction coefficient is xpressed as acombination of adhesive riction coefficient in elastic andplastic contact regime. Effects of fractal eometry parametersand normalized contact area on the adhesive frictioncoefficient are given by some calculated examples. Neglecting.and considering the interaction between asperities are bothinvolved in alculations, respectively, and different resultsre obtained.4) The effective riction coefficient in impact process is a.function of the impact process and the initial impact angleThe variation of liding, rolling and plouging state at each.instant makes the effective friction efficient during theoblique impact of a hard sphere against a ductile solid far lessthan the friction coefficient during simple continuous slidingon an average

探讨强冲击磨擦及切向柔量，耦合法向及切向强冲击效应，建立可滑移界面的强冲击响应模型。通过全程冲击滑移试验，揭示强冲击滑移与简单连续滑移的规律差异。通过间断冲击滑移试验，阐明粘附--滑移、滑移--滚动转化机理并解释表观斜冲击特性。成果可应用于冲击磨损分析、高速机械与结构控制、强冲击滑移间断模拟等。也供地震及有关浑沌研究参考。