摘要
为了描述岩土颗粒介质在应力波作用下的接触力与变形关系,运用接触力学和刚体动力学等理论方法,考虑颗粒体之间的局部非线性相互作用,通过引入恢复系数,导出了适用于低速冲击情况下的颗粒介质弹塑性接触模型,通过几种算例的比较分析,说明了该计算方法的合理性。结果表明:本文给出的接触力与变形关系,避开了复杂的增量形式和非线性动态接触问题,且反映了颗粒体的冲击速度、物理力学性质、几何特征以及表面物理条件等因素对接触过程的影响,便于工程推广应用。
In order to describe the force-displacement relationship of geotechnical granular medium under stress wave,an elastoplastic contact model of low velocity impact is derived according to the theories of contact mechanics and rigid dynamics,in which the local nonlinear dynamic interaction of granulae is considered and the coefficient of restitution is introduced.Then the rationalities of the contact model are verified by several examples.The results show that the complicated incremental formula and the problem of nonlinear dynamic contact have been avoided in the contact model;and the effects of many factors such as impact velocity,physico-mechanical property,geometrical characteristic and exterior physical condition of the granulae during contact are taken into account;therefore the contact model is convenient for engineering application.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第8期2580-2586,共7页
Rock and Soil Mechanics
关键词
接触力学
冲击
颗粒介质
恢复系数
接触模型
contact mechanics
impact
granular medium
coefficient of restitution
contact model
