Determination of tensile strain causing solidification cracking in welding
Determination of tensile strain causing solidification cracking in welding
复制标题
焊接中引起凝固裂纹的拉伸应变的测定
DOI：
10.1080/13621718.2020.1735706
复制
发表时间：
2020-03-06
影响因子：
3.3
通讯作者：
Kou, Sindo
中科院分区：
文献类型：
--
作者：
Liu, Jiangwei;Zeng, Pingwang;Kou, Sindo
当相邻的柱状晶粒被垂直于晶界的拉伸应变分离时，可能发生凝固裂纹。在这项研究中，一种方法来确定在焊接凝固裂纹引起的拉伸应变。建立了一个二维模型来计算凝固过程中垂直于晶界的拉伸应变，考虑了传热、应力和应变的演化。通过计算温度梯度确定晶界方向，然后利用应变转换法则计算垂直于晶界方向的应变，得到引起凝固裂纹的拉伸应变。该方法可为今后凝固裂纹的数值模拟和实验研究提供参考。
Solidification cracking can occur when neighbouring columnar grains are separated by tensile strain perpendicular to the grain boundary. In this study, a method to determine the tensile strain causing solidification cracking in welding was developed. A two-dimensional model was built to calculate the tensile strain perpendicular to the grain boundary during solidification, considering heat transfer, stress and strain evolution. The grain boundary direction was determined by calculating the temperature gradient and then the tensile strain causing solidification cracking was obtained by calculating the strain in the direction perpendicular to the grain boundary using strain transformation rule. This method to determine tensile strain causing solidification cracking can provide reference for future numerical and experimental studies on solidification cracking.