某些机械零件通过小的接触区(有时称为线接触)来传递或支承载荷。包括齿轮副、一些轴承,凸轮或滚柱的例子,像轮/轨或滚柱/滚道装置一样。由于接触区小,即使在轻载时这类零件也承受较高的集中应力。赫兹方程一般可用于接触应力的设计。这些方程考虑了静态接触面上的压力载荷,但大部分机械零件除运动还有滑动或有滑动趋势的接触面。滑动产生摩擦力,除受压载荷外它在接触面上还承受剪力,结果使接触面周围的应力状态复杂化。不适当的接触应力分析会使设计的零件 Some mechanical parts transmit or support loads through small contact areas (sometimes called line contacts). Examples include gear pairs, some bearings, cams or rollers, like wheel / rail or roller / raceway units. Due to the small contact area, such parts withstand high concentrations of stress even at light loads. The Hertz equation is generally used for contact stress design. These equations take into account the pressure load on static contact surfaces, but most mechanical parts have sliding or sliding contact surfaces in addition to movement. Sliding produces a frictional force which, in addition to a compressive load, also receives shear force at the contact surface, with the result that the state of stress around the contact surface is complicated. Inappropriate contact stress analysis will make the design of the parts