Torabi Ali Reza, Mirzavand Moslem, Saboori Behnam, Cicero Sergio
Fracture Research Laboratory, Faculty of New Sciences and Technologies, University of Tehran, Tehran 14395-1561, Iran.
Center of Excellence in Experimental Solid Mechanics and Dynamics, Fatigue and Fracture Research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846, Iran.
Materials (Basel). 2023 Feb 21;16(5):1757. doi: 10.3390/ma16051757.
The purpose of this study is to predict the load-bearing capacity (LBC) of fracture specimens containing V-notched friction-stir welded (FSWed) joints of AA7075-Cu and AA7075-AA6061 materials and subjected to mode I loading conditions. Due to the resulting elastic-plastic behavior and the corresponding development of significant plastic deformations, the fracture analysis of the FSWed alloys requires elastic-plastic fracture criteria, which are complex and time-consuming. Thus, in this study, the equivalent material concept (EMC) is applied, equating the actual AA7075-AA6061 and AA7075-Cu materials to equivalent virtual brittle materials. Then, two brittle fracture criteria, the maximum tangential stress (MTS) and mean stress (MS), are utilized to estimate the LBC of the V-notched FSWed parts. The comparison between the experimental results and the theoretical predictions reveals that both fracture criteria, in combination with EMC, can accurately predict the LBC in the analyzed components.
本研究的目的是预测含AA7075 - Cu和AA7075 - AA6061材料的V型缺口搅拌摩擦焊（FSWed）接头的断裂试样在I型加载条件下的承载能力（LBC）。由于产生的弹塑性行为以及相应显著塑性变形的发展，搅拌摩擦焊合金的断裂分析需要弹塑性断裂准则，这既复杂又耗时。因此，在本研究中，应用了等效材料概念（EMC），将实际的AA7075 - AA6061和AA7075 - Cu材料等同于等效的虚拟脆性材料。然后，利用两个脆性断裂准则，即最大切向应力（MTS）和平均应力（MS），来估计V型缺口搅拌摩擦焊件的承载能力。实验结果与理论预测之间的比较表明，结合等效材料概念的这两个断裂准则都能准确预测所分析部件的承载能力。
