Quantitative evaluation of augmented strain at the weld metal during the Trans-Varestraint test
Quantitative evaluation of augmented strain at the weld metal during the Trans-Varestraint test
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Trans-Varestraint 测试过程中焊缝金属增强应变的定量评估
DOI：
10.1007/s40194-021-01152-w
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发表时间：
2021
影响因子：
2.1
通讯作者：
Saida Kazuyoshi
中科院分区：
文献类型：
--
作者：
Yamashita Shotaro;Okano Shigetaka;Mochizuki Masahito;Saida Kazuyoshi
根据材料力学的理论，使用弯曲块的曲率半径和试样的厚度计算出的标称应变，评价了Trans-Varestraint试验中的热裂纹敏感性。使用室温下的材料特性计算标称应变。因此，在Trans-Varestraint测试中，不考虑由于温度分布引起的焊接部分周围的应变的不均匀性。因此，无法正确评价Trans-Varestraint测试中的应变。本研究的目的是揭示在焊缝金属的加载应变，以了解在跨变约束试验的热裂纹敏感性的评价。采用高速摄影机和高分辨率光学透镜对纯铁熔池后缘的加载应变进行了现场测量。比较了图像分析法和有限元法在焊缝中心处的应变测量结果。因此，清楚的是，由于沿着焊接线沿着发生的弯曲，应变集中在焊接部分上，并且超过标称应变的应变被加载到焊接熔池的后缘。
The hot cracking susceptibility in the Trans-Varestraint test was evaluated using the nominal strain calculated using the curvature radius of a bending block and the thickness of a specimen based on the theory of material mechanics. The nominal strain was calculated using the material properties at room temperature. Thus, in the Trans-Varestraint test, the non-uniformity of the strain around the weld part due to the temperature distribution is not considered. Therefore, the strain in the Trans-Varestraint test cannot be evaluated correctly. The aim of this study is to reveal the loaded strain at the weld metal to understand the evaluation of hot cracking susceptibility in the Trans-Varestraint test. The loaded strain around the trailing edge of the weld pool of pure iron was measured in-situ using a high-speed camera and high-resolution optical lens. The results of strains measured using image analysis and the finite-element method at the center of the weld bead were compared. Accordingly, it was clarified that the strain was concentrated on the weld part owing to the bending occurring along the weld line, and the strain exceeding the nominal strain was loaded to the trailing edge of the weld pool.