权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

FORMULATION OF CONSTITUTIVE EQUATION OF FRICTION BASED ON CONCEPT OF SUBLADING SURFACE

基于底面概念的摩擦本构方程的建立

基本信息

批准号：
17560446
负责人：
HASHIGUCHI Koichi
金额：
$ 2.11万
依托单位：
KYUSHU UNIVERCITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560446/
关键词：
Friction Static friction Kinetic friction Time-dependence Subloading surface Elastoplasticity Viscoplasticity Hardening softening

项目摘要

Description of the friction phenomenon as a constitutive equation has been attained first as a rigid-plasticity. Further, it has been extended to an elastoplasticity However, the interior of the sliding-yield surface has been assumed to be an elastic domain and thus the plastic-sliding velocity due to the rate of traction inside the sliding-yield surface is not described. Therefore, the accumulation of plastic-sliding due to the cyclic loading of contact traction cannot be described by these models. On the other hand, the first author of the present article has proposed the subloading surface model which is capable of describing the plastic strain rate by the rate of stress inside the yield surface. Further, the authors proposed the subloading-friction model which describes the smooth transition from the elastic-to plastic-sliding state by incorporating the concept of subloading surface.It is widely known that when bodies at rest begin to slide to each other, a high friction coefficient appears first, which is called the static-friction, and then it decreases approaching a stationary value, called the kinetic-friction. Further, it has been found that if the sliding ceases for a while and then it starts again, the friction coefficient recovers and the identical behavior as that in the initial sliding is reproduced.In this research, the subloading-friction model was extended so as to describe the decrease of friction coefficient from the static-to kinetic-friction by the isotropic softening due to the plastic-sliding and the recovery of friction coefficient by the isotropic hardening due to the creep deformations of surface asperities under the contact pressure. The qualitative property of the present model is examined by numerical experiments and the validity for prediction of friction behavior of real materials is verified comparing with test data for the linear sliding phenomenon.

作为本构方程的摩擦现象的描述已达到作为刚塑性第一。此外，它已被扩展到弹塑性然而，滑动屈服面的内部已被假定为弹性域，因此塑性滑动速度由于滑动屈服面内的牵引率没有描述。因此，塑性滑动的积累，由于接触牵引的循环加载不能用这些模型来描述。另一方面，本文第一作者提出了次加载面模型，该模型能够用屈服面内的应力速率来描述塑性应变速率。在此基础上，作者提出了亚加载摩擦模型，该模型引入了亚加载面的概念，描述了从弹性滑动到塑性滑动的平稳过渡，当静止物体相互滑动时，开始出现一个较高的摩擦系数，称为静摩擦系数，然后摩擦系数逐渐减小，接近一个稳定值，称为动摩擦系数。此外，已经发现，如果滑动停止一段时间，然后再次开始，摩擦系数恢复，并再现与初始滑动相同的行为。对副载摩擦模型进行了扩展，使其能描述由于塑性软化引起的摩擦系数从静摩擦到动摩擦的减小。滑动和摩擦系数的恢复是由于接触压力下表面微凸体的蠕变变形引起的各向同性硬化。通过数值试验验证了该模型的定性性质，并与线性滑动现象的试验数据进行了比较，验证了该模型对预测真实的材料摩擦行为的有效性。