韧-脆转变温度区间内焊接接头断裂韧度预测  

Prediction of fracture toughness for welded joints in brittle-ductile transition temperture

作　　者：荆洪阳[1] 徐连勇[1] 霍立兴[1] 张玉凤[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《焊接学报》2004年第1期45-47,51,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目 (5 0 2 75 10 7) ;霍英东青年教师科研基金资助项目 (810 45 )

摘　　要：首先对采用同种焊接材料施焊的X80及X6 5管线用钢焊接接头 ,在韧脆转变温度区间测试了其断裂韧度 ,试验研究了强度匹配、试样几何形式对接头断裂行为的影响。然后根据局部法由标准三点弯曲试样的断裂韧度值 ,得出反映材料的脆性断裂控制参量m、σu,再根据该参量对同种接头及不同强度匹配接头双边裂纹拉伸试样的断裂行为进行了定量预测 ,当考虑韧脆转变温度区间内的延性裂纹扩展后 ,预测结果与试验结果相当吻合。表明 ,局部法能很好地描述材料的断裂行为。The fracture toughness CTOD was measured for the X80 and X65 welded joints in the brittle-ductile transition temperature. The effects of strength mis-matching and specimen geometry on the fracture behavior for welded joint were conducted by experiment. The parameters controlling brittle fracture are gotten from the fracture toughness result of standard 3 point bending specimen, then the fracture behavior of the tension specimen for the welded joint with different strength mis-matching are predicted based on the local approach. It is found that the predicted result is in a good agreement with the experiment, and the local approach gives a good description of brittle fracture even though ductile crack growth prior to final fracture occurs.

关 键 词：局部法 断裂韧度 延性裂纹扩展 强度匹配 焊接接头 韧-脆转变温度区间内 

分 类 号：TG407[金属学及工艺—焊接]