在悬臂弯曲加载方式下,采用逐级递增的六级名义应变控制模式,完成了三件10CrNiMo钢试样的低周疲劳表面裂纹扩展速率试验.试验数据处理结果表明:在每级名义应变控制下,位移和载荷的峰谷值是基本保持不变的,但随着名义应变级别的增加,位移和载荷的均值存在向负向增大的趋势；而在低名义应变级别控制下,应变峰谷值的变化规律和位移与载荷的峰谷值的变化规律相似,但随着名义应变级别的增加,应变的峰谷值和均值均存在向正向增大的趋势.分析认为,产生上述现象的原因主要和试样表面的残余应变有关.
Under cantilever bend loading,a test method of six-grade nominal strain from low to high gradually as controlling mode was adopted and low cycle fatigue surface crack propagation rate test of 10CrNiMo steel were performed in three pieces of specimens.The test data manifested that under the control of every grade nominal strain,the peak and valley values of displacement and force were invariable basically,and with increase of the nominal strain grade,the average values of displacement and force had a tendency of increase to negative direction,while under the control of low nominal strain,evolution law of the three values of strain were similar as those of displacement and force,but with increase of nominal strain grade,the peak and valley values of strain trended to enlarge to the positive direction.An analysis was carried out and the results showed the reason of above phenomena was relative to residual strain.
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