使点的球与滚道接触(椭圆接触时加载)。
The balls make point contact with the raceways (elliptical contact when loaded).
对金属橡胶叠层复合材料进行动态加载试验，发现该材料具有明显的非线性迟滞特征，迟滞回线并非椭圆。
The dynamic load test is carried out for the metal rubber laminated composite. It is found that the composite has nonlinear hysteretic characteristics, and hysteretic curve is not ellipse.
试验表明，这是由于管道受载后，裂纹处管道截面变椭圆及由于管道弯曲变形导致加载过程中力臂的变化所引起。
It is mainly caused by the ovalization of the cracked cross section and the changing of the lever-arm while the pipe is deformed when being bended.
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