Abstract This study investigates a unified residual stress model applicable for welded high-strength steel (HSS) I-beams. In the experimental program, the homogeneous specimens including two prismatic I-beam samples and a web-tapered I-beam fabricated from Australian BISPLATE-80 and BISPLATE-100 steel plates having nominal yield stresses of 690 MPa and 890 MPa respectively were inspected to determine their residual stress distribution using a non-destructive neutron diffraction technique. Details of this neutron diffraction method for measuring residual stresses are presented. It is shown that the technique can achieve high spatial resolution of the residual stresses as well as capturing the high stress gradient in the heat-affected zone, as a consequence of the deep penetration of the neutron particles into the material. The pattern of residual stresses in the specimens reveals that the tensile stresses peak at the flange-web junctions at an average of 70% of the parent material yield stresses, and that the compressive residual stresses have an approximately uniform distribution that dominates large regions of the flange and web. The test results reconfirm the compressive residual stresses being related to the geometry of the cross-section and independent of the steel grade. The interaction of the residual stresses in the flanges and web was found to be negligible for both prismatic and web-tapered beams. A residual stress model applicable for welded thin-walled I-section members for steel grades between 460 MPa and 1000 MPa is proposed by fitting the test results and collective data available in the literature. This representation was incorporated into a detailed finite element (FE) model and it is shown that the FE predictions are in good agreement with the results of experiments conducted on a wide range of HSS I-section beams tested to failure caused by buckling and/or yielding.

中文翻译：

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焊接高强度钢工字梁中的残余应力

摘要 本研究研究了适用于焊接高强度钢 (HSS) 工字梁的统一残余应力模型。在实验程序中，包括两个棱柱形工字梁样品和一个由澳大利亚 BIPLATE-80 和 BISPLATE-100 钢板制成的均质试件，分别具有 690 MPa 和 890 MPa 的标称屈服应力，以确定使用非破坏性中子衍射技术测量其残余应力分布。介绍了这种用于测量残余应力的中子衍射方法的详细信息。结果表明，该技术可以实现残余应力的高空间分辨率，并捕获热影响区的高应力梯度，这是中子粒子深入材料的结果。试样中的残余应力模式表明，拉伸应力在翼缘 - 腹板连接处达到峰值，平均为母材屈服应力的 70%，并且残余压应力具有近似均匀的分布，在大部分区域占主导地位。法兰和腹板。测试结果再次确认压缩残余应力与横截面的几何形状有关，与钢种无关。发现翼缘和腹板中残余应力的相互作用对于棱柱和腹板锥形梁都可以忽略不计。通过拟合试验结果和文献中可用的集体数据，提出了适用于 460 MPa 至 1000 MPa 钢种的焊接薄壁 I 型截面构件的残余应力模型。