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针对 9310钢研究了试验参数对疲劳小裂纹门槛值测试结果的影响。结果表明 ,对于 9310高强钢采用恒Kmax 升Kmin方法进行小裂纹门槛值试验时 ,规范化的应力强度因子梯度CK 和Δα值的选取对门槛值的影响很小。当Kmax在线弹性范围内选取时 ,由于裂尖过程区的断裂机制未发生变化 ,Kmax的选取对门槛值测试结果也基本没有影响
The effect of test parameters on the test results of fatigue crack threshold was studied for 9310 steel. The results show that the normalized stress intensity factor gradient CK and Δα value have little effect on the threshold value for 9310 high-strength steel with constant Kmax and Kmin method. When Kmax is selected within the range of linear elasticity, the selection of Kmax has no effect on the threshold test results because the fracture mechanism of the crack tip process area has not changed