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| Q355钢板对接接头裂纹扩展所致焊接残余应力重分布研究 |
| Redistribution of Welding Residual Stress Caused by Crack Propagation in Butt Joint of Q355 Steel Plate |
| Received:April 26, 2023 |
| DOI：10.3969/j.issn.1674-6457.2023.10.018 |
| 中文关键词: 焊接残余应力 裂纹扩展 应力释放 应力重分布 试验测试 |
| 英文关键词: residual welding stress crack propagation stress release stress redistribution experimental test |
| 基金项目:国家自然科学基金(51708467，52108385) |
| Author Name | Affiliation | | GU Song | School of Civil Engineering and Architecture, Southwest University of Science and Technology, Sichuan Mianyang 621010, China | | LIN Xiao-yu | School of Civil Engineering and Architecture, Southwest University of Science and Technology, Sichuan Mianyang 621010, China | | GU Ying | School of Civil Engineering and Architecture, Southwest University of Science and Technology, Sichuan Mianyang 621010, China | | ZHAO Ya-jie | Sichuan Communication Surveying Design Institute Co., Ltd., Chengdu 620017, China | | KONG Chao | School of Civil Engineering and Architecture, Southwest University of Science and Technology, Sichuan Mianyang 621010, China | | REN Song-bo | School of Civil Engineering and Architecture, Southwest University of Science and Technology, Sichuan Mianyang 621010, China |
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| 中文摘要: |
| 目的 定量研究裂纹扩展导致的焊接残余应力重分布效应，得到残余应力随裂纹扩展的变化规律。方法 首先采用盲孔法测试了Q355钢板对接接头的初始残余应力;其次利用线切割技术模拟了平行以及垂直于焊缝的裂纹扩展情况，并测试了裂纹扩展导致的残余应力变化量;最后根据测试数据提出了残余应力释放量Δσ与裂纹长度a之间的函数关系式，进一步得到了基于裂纹扩展的应力重分布计算公式。结果 Q355钢板对接焊的焊缝区纵向(沿焊缝方向)存在较大的残余拉应力，拉应力峰值出现在焊趾处，为屈服强度的1.13倍。焊缝区横向存在梯度较大、拉压交替变化的残余应力，压应力峰值出现在焊趾处，大小为52.6 MPa，拉应力峰值出现在距焊缝中心线17 mm处，大小为63.5 MPa。裂纹扩展能显著释放残余拉应力:裂纹沿焊缝中心扩展，横向残余拉应力峰值降低了45.8%;裂纹沿垂直于焊缝方向扩展，焊趾处的拉应力峰值降低了63.3%。结论 裂纹扩展会显著影响焊接构件的残余应力分布，根据实测数据提出的裂纹扩展应力重分布计算公式能够较好地反映残余应力重分布情况。 |
| 英文摘要: |
| The work aims to quantitatively study the redistribution effect of welding residual stress caused by crack propagation, and obtain the variation law of residual stress with crack propagation. First, the initial residual stress of the Q355 steel plate butt joint was tested through the blind hole method. Then, the crack propagation parallel and perpendicular to the weld seam was simulated with the wire-cutting technology, and the changes in residual stress caused by crack propagation were measured. Finally, based on the test data, a functional relationship between the residual stress release amount Δσ and the crack length a was proposed, and further, a calculation formula for stress redistribution with crack propagation was derived. The results showed that:in the weld zone of the Q355 steel plate butt joint, there was a significant longitudinal residual tensile stress (along the direction of the weld seam), with the peak tensile stress occurring at the weld toe, reaching up to 1.13 times the yield strength. There was also a large gradient and alternating tensile-compressive residual stress in the transverse direction of the weld zone. The peak compressive stress appeared at the weld toe, measuring 52.6 MPa, while the peak tensile stress occurred at a distance of 17 mm from the center line of the weld seam, measuring 63.5 MPa. Crack propagation resulted in a significant release of residual tensile stress. When the crack propagated along the center line of the weld seam, the peak transverse residual tensile stress decreased by 45.8%. When the crack propagated perpendicular to the weld seam, the peak tensile stress at the weld toe decreased by 63.3%. To sum up, the propagation of cracks significantly affects the residual stress distribution in welded components. The crack propagation stress redistribution calculation formula proposed based on the measured data can effectively reflect the redistribution of residual stress. |
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