桥梁钢Q420qE低温CTOD断裂韧性试验研究

摘要

According to the British BS7448 experiment standard for the fracture toughness and DNV-OS-C401,the paper undertakes the three-point bending CTOD（the Crack Tip Opening Displacement） fracture toughness experiment on the common steel Q420qE of bridges,measures the eigenvalue of low-temperature（-20 ℃）base metal,the heat affected zone,and welding CTOD,and achieves respective conclusions.%依据英国标准BS7448断裂韧度试验标准和DNV-OS-C401,对桥梁常用钢Q420qE进行了三点弯曲CTOD（裂纹尖端张开位移）断裂韧度试验,测试了在低温（-20℃）母材、热影响区、焊缝的CTOD特征值,得出相应的结论。