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本文对JPM—1型和JP—BD型接触疲劳试验机试验方法暂行规定中所推荐的几种不同形状(凸台形、梯形、园弧形)的试样,进行了三维光弹接触应力分析,定量地得到了应力分布情况。在对实验和计算结果进行了比较之后,建议采用园弧形试样为标准试样。其优点是:(1)对实验条件的要求比较宽,试验结果可比性好;(2)试样形状接近工程实际中多数产生疲劳破坏的零件,因而具有典型性;(3)加比较小的载荷就可在试样内产生较大的应力,因而可以延长接触疲劳试验机加力轴的使用寿命。
In this paper, the three-dimensional photoelastic contact stress analysis is carried out on several specimens of different shapes (boss, trapezoid and circular arc) recommended in the Provisional Provisions for the Test Methods of JPM-1 and JP-BD Contact Fatigue Tester. The stress distribution was quantitatively obtained. After comparing the experimental results with the calculated results, it is recommended to use a circular arc specimen as a standard specimen. The advantages are: (1) the requirements of the experimental conditions are relatively wide, the comparability of the test results are good; (2) the sample shape close to the engineering practice most of the components that produce fatigue damage, which is typical; (3) Load can produce greater stress in the specimen, which can extend the contact fatigue test machine afterburner shaft life.