Changzhong WU
,
Huaining CHEN
,
Jing CHEN
,
Quanhong LIN
材料科学技术（英文）
The explosion treatment technique has been used in the relief of residual stresses in 800 MPa grade high strength steel manual welded joints. The residual stresses on surface and through thickness of the weldment were measured for both as-welded and explosion-treated sample, the mechanical properties of welded joints under different conditions were also tested. The effect of explosion treatment on the fracture toughness of materials with a residual defect was investigated by crack opening displacement (COD) test. The results show that explosion treatment can reduce not only the surface residual stress but also the residual stress through thickness in the welded joints. The effect of explosion treatment on the mechanical properties and a residual defect in welded joint were inconspicuous.
关键词:
High strength steel
,
爆炸处理
,
残余应力
,
接头力学性能
,
CO
王宾
,
谢霞
,
温秉权
,
路学成
,
谢坤
材料科学与工程学报
材料的COD(裂纹张开位移)、示波冲击试验是常用的断裂韧性测试,根据局部法若能从一种实验结果预测另一种实验结果具有重要意义.本研究以X65钢为试验材料,对其进行了示波冲击及COD试验,并对试验数据进行统计处理,证明断裂参量CTOD(裂纹尖端张开位移)符合三参数威布尔分布.编制了自动求解局部断裂参量及由示波冲击预测CTOD的程序.通过比较COD实验和预测结果,表明在脆性断裂条件下基于局部法能够实现由示波冲击试验预测CTOD断裂韧性.
关键词:
局部法
,
示波冲击实验
,
COD试验
