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Evaluationofsmallfatiguecrackclosureandfatiguestrength(Ⅱ)ZHANGLuomingetal.3讨论3．1裂纹扩展抵抗阴力曲线法3.1.1裂纹扩展抵抗阻力曲线如上所述，裂纹闭合程度对裂纹的扩展速度起着重要的作用。这种闭合是因裂纹顶端后部的裂纹上下两表面的接触而产生的。随着裂纹的扩展
Evaluationofsmallfatiguecrackclosureandfatiguestrength (II) ZHANGLuomingetal.3 DISCUSSION 3.1 Crack propagation resistance against negative force curve method 3.1.1 Crack propagation resistance resistance curve As mentioned above, the degree of crack closure plays an important role in the crack propagation rate. This closure is caused by the contact of the upper and lower surfaces of the crack at the rear of the crack tip. With the crack growth