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本文提出了一个新的断裂准则——裂纹咀张开位移率准则及新的材料断裂韧性参量V(?),并用实验验证了该准则的有效性。该准则特别适用于表面裂纹弹塑性起裂载荷的确定。V(?)可以用单试件法测定,并给出了 V_(1c)与 K_(1(?)),σ_c,J(?)的相互换算关系式。
In this paper, a new fracture criterion, the crack initiation opening displacement criterion and a new material fracture toughness parameter, V (?), Are proposed. The validity of this criterion is verified by experiments. This guideline is especially suitable for the determination of surface cracked elasto-plastic initiation load. V (?) Can be measured by single specimen method, and the relationship between V_ (1c) and K_ (1), σ_c, J (?) Is given.