基于损伤理论的颗粒材料接触摩擦特性研究

Research on Contact Friction Characteristic of Praticle Material Based on Damage Theory

颗粒材料的接触摩擦特性非常复杂。将颗粒材料法向非弹性接触看成是一种接触损伤,根据连续损伤理论,在引入合理假设的基础上,定义了颗粒材料的接触损伤变量,建立了相应的损伤演化方程,结合Lemaitre等效应变假设,研究了颗粒接触损伤对颗粒体材料接触摩擦特性的影响。结果表明,颗粒接触损伤模型能较好地预测颗粒材料法向压力-接触变形特性;考虑接触损伤后,接触面上的法向应力分布更为平缓,接触面积增大,并能较好地预测颗粒材料切向微观位移特性。

The characters of contact friction of particle material are quite complexness.Considering normal non-elasticity contact as damage through contact,according to continuous damage theory,and based on the reasonable assumption,the damage variable of particle material was defined and the corresponding damage evaluation equation was created.Combined with Lemaitre equivalent strain assumption,the effects of particle material damage through contact on characters of friction contact were studied.The results indicated that the damage through contact model of particle material can predict the character of normal pressure-contact deformation.Normal stress on contact area is easy curve and contact area exaggeration when damage through contact has been considered.The characters of tangential micro-displacement can be predicted by considering damage through contact.