论文部分内容阅读
用ASTM和JSMER-曲线法以及JSME伸张区宽度(SZW)法对两种钢和一种铝合金进行了J_(lc)试验。SZW法在延性撕裂起始时具有过高的评定J_(lc)的倾向。ASTM方法也具有过高地评定J_(lc)值的倾向,而且似乎是最简便和稳定的方法。JSMER-曲线方法给出最小的J_(lc)值,在物理上最接近开裂点。
J_ (lc) tests were performed on both steels and an aluminum alloy using the ASTM and JSMER-curve methods and the JSME stretch zone width (SZW) method. The SZW method has an excessively high tendency to assess J_ (lc) at the onset of ductile tearing. The ASTM method also has a tendency to overestimate the value of J_ (lc) and appears to be the easiest and most stable method. The JSMER-curve method gives the smallest J_ (lc) value, physically closest to the point of cracking.