通过对18Cr2Ni4WA钢在不同应力比和不同载荷下的疲劳裂纹扩展速率试验,拟合得Paris关系式,然后对试验断口进行疲劳条带宽度S(微观裂纹扩展速率)测量,将疲劳条带宽度值代入拟合的Paris关系式中,反推计算断口试样的疲劳应力变幅.结果表明,疲劳条带宽度只在疲劳裂纹扩展的一定阶段与宏观裂纹扩展速率相等,选择该阶段的数据点进行疲劳应力变幅反推计算,相对误差在10%以下;数据点是否位于宏、微观裂纹扩展速率相等的阶段,可由S～yπa双对数座标S形曲线判定,并发现由于裂纹扩展速率的误差传递系数小于0.5,计算结果对裂纹扩展速率测量的相对误差不敏感.
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