Influence of strain-hardening models and slopes on the predicted residual stresses in structural steel S235 weldments
Influence of strain-hardening models and slopes on the predicted residual stresses in structural steel S235 weldments
复制标题
应变硬化模型和斜率对结构钢 S235 焊件预测残余应力的影响
DOI：
10.1016/j.jmrt.2022.06.134
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Dilger
中科院分区：
文献类型：
--
作者：
Nitschke-Pagel;Dilger
本研究的目的是系统地了解应变硬化模型以及与相和温度相关的应变硬化斜率如何影响由广泛使用的结构钢 S235 制成的单道焊接接头中计算的残余应力。实验方法和数值模拟均已用于研究。结果表明，材料塑性模型对预测焊接残余应力 (WRS) 有很大影响。当使用各向同性硬化模型时，计算出的板内焊缝区域附近的母材 (BM) 中的 WRS 幅度最大，而应用运动硬化模型时，WRS 幅度最小。预测与测量的比较表明，各向同性硬化模型可以更准确地预测 S235 钢的 WRS。生成相（本例中为奥氏体和贝氏体）随温度变化的应变硬化斜率的变化实际上对预测的 WRS 没有影响。焊缝区附近 BM 中计算的纵向残余应力 (LRS) 量对初始微观结构（此处为铁素体）所施加的应变硬化斜率高度敏感，而横向残余应力 (TRS) 则不然。与高温下初始微观结构的应变硬化斜率相比，室温下的应变硬化斜率在模拟 LRS 中起着至关重要的作用。在这项研究中，为如何在数值焊接模拟中经济可靠地确定特定钢材的相和温度相关应变硬化斜率提供了指导。
The objective of this research is to systematically understand how strain-hardening models and phase- and temperature-dependent strain-hardening slopes affect the computed residual stresses in single-pass welded joints made of the widely used structural steel S235. Both experimental methods and numerical simulation have been utilized for investigation. The results reveal that the material plasticity model has a massive effect on the predicted welding residual stresses (WRS). The calculated magnitude of WRS in the base metal (BM) adjacent to the weld zone inside the plate is largest when the isotropic hardening model is used, while it is smallest applying the kinematic hardening model. The comparison of predictions with measurements shows that the isotropic hardening model can predict WRS more accurately for S235 steel. The change in the temperature-dependent strain-hardening slopes of the generated phases (austenite and bainite in this case) have practically no impact on the predicted WRS. The calculated longitudinal residual stress (LRS) amount in BM nearby the weld zone is highly sensitive to the applied strain-hardening slopes of the initial microstructure (ferrite here), while that of transverse residual stress (TRS) is not. In contrast to the strain-hardening slopes of the initial microstructure at elevated temperatures, that at room temperature plays a crucial role in the simulated LRS. In this study, guidance is provided on how the phase- and temperature-dependent strain-hardening slopes of a specific steel can be determined economically and reliably in numerical welding simulation.
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影响因子：
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