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本文中，我们试验了流动应力从４３ｋｇｆ／ｍｍ到１０４ｋｇｆ／ｍｍ２的七种材料（包括结构钢、铝合金和钛合金）并且用扫描电镜测定了这些材料的伸张区宽度，其结果表明钝化线不决定于流动应力σｆｌｏｗ而决定于杨氏模量Ｅ，并且给出下列关系式 ＳＺＷ＝－３．８６ ｘ １０－３＋８９．８Ｊ／Ｅ结果还表明，当裂纹具有一真实扩展时，伸张区宽度达到一临界值ＳＺＷｃ同时，我们可以根据 ＳＺＷ～Ｊ关系利用 ＳＺＷｃ的概念确定 Ｊ１Ｃ。
In this paper, we tested seven materials (including structural steel, aluminum alloy and titanium alloy) with flow stress ranging from 43kgf / mm to 104kgf / mm2 and measured the width of the tensile zone of these materials with a scanning electron microscope. The results show that the passivation line Is not determined by the flow stress σflow but is determined by the Young’s modulus E and gives the following relation SZW = -3.86 × 10 -3 + 89.8 J / E The results also show that when the crack has a true extension, the width of the extension At the same time, we can use the concept of SZWc to determine J1C according to the SZW-J relationship.