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探讨纯Ⅱ型加载BHW－35钢断裂韧性随温度的变化规律．有限元分析及实验研究表明：Ⅱ型加载下存在两种类型的裂纹扩张方式-滑开型与张开型；温度的变化导致裂纹扩张方式的改变．文中对两种扩张方式的临界J积分随温度的变化规律以及裂纹扩张方式转变临界温度作了进一步讨论．
To investigate the change rule of fracture toughness of pure type Ⅱ loaded BHW-35 steel with temperature. Finite element analysis and experimental studies show that there are two types of crack expansion under Type Ⅱ loading - sliding open type and open type; the change of temperature leads to the change of crack expansion mode. In this paper, the critical J integrals of the two modes of expansion are further discussed with the changing laws of temperature and the transition critical temperature of crack expansion mode.