利用扫描电镜对一些断裂韧性试样的断口表面进行了观察.发现:对于遵从准解理机制开裂的材料,从预制裂纹顶端到其前缘的初始准解理开裂源的平均距离ξ是一个特征参数,它不仅与断裂韧度G_(Ic)有学,而且是塑性区应力场的一个重要参量.
The fracture surfaces of certain fracture toughness specimens have been ex-amined by SEM. With materials fractured in quasi-cleavage mechanism, the meandistance, ξ, from the pre-crack tip to the site where the quasi-cleavage crackstarts is regarded to be a characteristic parameter. It seems that this related toG_(Ic) and can be used as an important parameter characterizing the stress field ofthe plastic zone.
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