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一种确定延性金属静动态启裂点的新方法

RuiTang LIU,ZhiFang ZHOU,XiuMei ZHANG,ChunHuan GUO

Jixie Qiangdu/Journal of Mechanical Strength（2007）

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Abstract
在静动态J积分试验的基础上,应用曲线分析技术确定该钢的静动态启裂点.研究表明,在静动态J积分试验中,预制裂纹钝化、启裂到稳态扩展的过程是裂纹前沿由塑性滑移变形主导的钝化阶段与由微孔形核、长大与连结主导的延性断裂阶段发展的连续过程,启裂点实际上是这两个阶段之间的过渡点,它与lg J-lg Δa曲线上的转折点相对应.由此方法确定的静动态启裂位置均与断口上实测的临界伸张区宽度吻合得较好.
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Key words
Crack initiation point,Static and dynamic J-integral,Testing-curve-analysis
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