Modelling of Friction Stir Welded AA2139 Aluminium Alloy Panels in Tension and Blast
Modelling of Friction Stir Welded AA2139 Aluminium Alloy Panels in Tension and Blast
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DOI：
10.1016/j.ijimpeng.2022.104163
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发表时间：
2022-01
影响因子：
5.1
通讯作者：
A.J. Awang Draup;B. Rodgers;P. Prangnell;Q. Li;M. Lunt;J. Robson
中科院分区：
文献类型：
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作者：
A.J. Awang Draup;B. Rodgers;P. Prangnell;Q. Li;M. Lunt;J. Robson
预测爆炸载荷下焊缝的性能是具有挑战性的，特别是在焊接区域与显著的材料性能梯度相关联的合金中。这种情况出现在铝合金AA2139的摩擦搅拌焊接中，其代表了高强度铝合金的示例情况。为了解决这个问题，一种新的多尺度模型已被开发，捕捉焊接的微观结构的影响，并将其链接到本构材料的行为。通过在足够尺寸的试样中产生等效微观结构来确定局部焊接区域的性质，以进行代表性拉伸和高应变率压缩测试。通过这种方式，可以基于基本控制微观结构获得局部材料特性，而与焊缝配置无关。的本构行为通知在宏观尺度的有限元模型，其中所产生的微观结构变化的材料性能梯度被捕获。该模型已被证明可以准确地预测整个焊接区的局部应变演变，并表明跨焊缝拉伸试验和空气冲击载荷的热影响区区域中发生应变局部化。结果表明，焊缝区之间的强度的逐渐变化必须正确占正确的应变局部化行为预测。这项工作突出了准确描述爆炸载荷下的结构在确定响应的当地材料特性的变化的重要性。
Predicting the performance of welds under blast loading is challenging, particularly in alloys where the weld region is associated with significant material property gradients. This situation arises for friction stir welds of aluminium alloy AA2139, which represents an example case of a high strength aluminium alloy. To address this problem, a novel multiscale model has been developed that captures the effect of welding on the microstructure and links this to the constitutive material behaviour. The properties of the local weld regions are determined by generating equivalent microstructures in specimens of sufficient size to perform representative tensile and high strain rate compression tests. In this way, the local material properties can be obtained based on the fundamental controlling microstructure, independent of the weld configuration. The constitutive behaviour informs a finite-element model at the macro-scale in which material property gradients arising from microstructural changes are captured. The model has been demonstrated to accurately predict the local strain evolution across the weld zone and demonstrates that strain localization occurs in the heat affected zone region for both cross-weld tensile tests and air blast loading. It is shown that the gradual change in strength between weld zones must be correctly accounted for to predict the correct strain localization behaviour. The work highlights the importance of an accurate description of the variation in local material properties in determining the response of structures under blast loading.