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切口根部的局部应变范围(简称局部应变范围)是控制切口根部疲劳裂纹起始的重要因素。 应变硬化指数n小的金属材料的局部应变范围△ε的计算模型和公式为
The local strain range at the root of the incision (referred to as the local strain range) is an important factor in the initiation of fatigue crack initiation at the root of the incision. The calculation model and formula for the local strain range Δε of metallic materials with small strain hardening index n are