【摘要】 应用考虑力矩的弹簧-滑块-平面模型,对摩擦试验加载过程中的非线性变化进行了分析。结果表明,当加载过程进行到一定程度时,因力矩的作用而出现的剪应力分布的调整,将造成滑动发生前的力-位移曲线的非线性变化。更多还原

【Abstract】 The nonlinearity in loading process of frictional tests is discussed by using 3D spring-rider-flat model with moment considered. Due to the moment of driving force,the normal stress on the flat does not distribute uniformly,which induces nonuniform distribution of frictional resistance by assuming friction coefficient is constant. The whole loading process actually consists of two stages. (1) Before the shear stress reaches the resistance,the rider does neither slide nor deform and the force-displacement curve is linear. (2) After the shear stress,because of the moment,reaches the resistance firstly at the end where the driving force acts,the rider deforms before it slides as a whole. The deformation of the rider will lead to redistribution of the shear stress on the flat and the nonlinear curve of force-displacement should be considered. Since no damage happens to the flat,this mechanism can repeatedly produce such nonlinear phenomenon.更多还原