Local compression process avoiding toughness change
Local compression process avoiding toughness change
复制标题
局部压缩过程避免韧性变化
DOI：
10.1007/s40194-022-01386-2
复制
发表时间：
2023
影响因子：
2.1
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Ozawa;T.;Kosuge;H.;Mikami;Y.;Kawabata;T.
局部压缩技术用于在焊缝试样中实现直裂纹前沿。然而，一些感兴趣的人士报告说它会降低断裂韧性值。作者通过数值分析研究了在保持断裂韧性值的同时确保直裂纹前沿的更好的局部压缩条件，结果发现一些不涉及裂纹尖端压缩的局部压缩条件是有希望的。还对这些局部压缩进行了断裂韧性试验，试验结果表明，疲劳预裂纹形状和断裂韧性值遵循数值分析估计的趋势。两种局部压缩条件，即用方形夹具压缩未来切口侧和韧带侧以及用圆形夹具压缩韧带侧，在保持断裂韧性值的同时实现了直裂纹前沿。作者得出的结论是，这些新技术优于 ISO 15,653 中推荐的技术。
The local compression technique is used to achieve a straight crack front in weld specimens. However, some interested parties have reported that it decreases the fracture toughness value. The authors investigated the better local compression condition for securing a straight crack front while maintaining the fracture toughness value by a numerical analysis, and as a result, some local compression conditions, which do not involve compression of the crack tip, identified as promising. Fracture toughness tests were also conducted with these local compressions, and the test results showed that the fatigue precrack shape and fracture toughness value follows those estimated tendency by the numerical analysis. Two local compression conditions, which compress at the future notch side and ligament side by a square jig and at the ligament side by a circle jig, achieved a straight crack front while maintaining the fracture toughness value. The authors concluded that these new techniques are superior to that recommended in ISO 15,653.