高强钢焊接区“三点弯曲”试验拘束应力的测定

• 作 者: 刘强 王娟
• 机 构: 济南市锅炉压力容器检验研究所,山东大学材料液态结构及其遗传性教育部重点实验室,山东大学材料液态结构及其遗传性教育部重点实验室 250033,济南市250061,济南市250061
• 出 处: 焊接
• 发表日期: 2003年07期
• 关键词: 高强钢 气体保护焊 三点弯曲 焊接区 熔合区 外加载荷 弹性范围 钢焊接 塑变 公式计算值

采用“三点弯曲”试验对HQ13 0高强钢焊接熔合区附近的应力状态进行了试验测定。试验结果表明 ,外加载荷增大 ,焊接试样的应力应变值逐渐增大 ,经过近似直线的弹性范围后 ,达到塑变区后应变发生突变。外加载荷增加使产生裂纹的可能性增大。尽管应变的公式计算值和实测值之间存在着一定的偏差 ,但二者的总体趋势是一致的 ,在要求不太严格或只要求获得应力变化规律的情况下 ,仍可用公式法估算。

The “three-point bending” test was used to test the stress state near the weld zone of HQ13 0 high strength steel. The experimental results show that the stress and strain of the welded specimen increase gradually with the increase of applied load. After the elastic range of approximate straight line, the strain of the welded specimen reaches a sudden change after it reaches the plastic deformation zone. Increasing the load increases the possibility of cracking. Although there is a certain deviation between calculated and measured values ​​of strain, the general trend of the two is consistent. In the case of less stringent requirements or only when the law of stress changes is required, formulating can still be used.