Heterogeneous deformation of friction stir welded aluminum alloy 6061 in tension and high cycle fatigue

IF 3.5 Q1 ENGINEERING, MULTIDISCIPLINARY
Y. Dai, Chang Liu, M. Zhan, Xiangyu Wang, C. He, Qingyuan Wang
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引用次数: 0

Abstract

PurposeThe investigations provide a basis for the optimization of the alloy 6061-T6 friction stir welding (FSW) process to improve the mechanical properties of welded joints.Design/methodology/approachThe local deformation of the FSW joint in tension and fatigue test were experimentally investigated by digital image correlation (DIC) technique.FindingsThe local stress-strain behaviors of the sub-regions show that the plastic strain always concentrated at the heat affected zone (HAZ) on the advancing side both in tension and high cycle fatigue and eventually leads to the final fracture. The evolution of the plastic strain at very low stress is extremely slow and accounts for most of the total fatigue life. However, the local deformation exhibits a sudden increase just before the fatigue failure.Originality/valueBased on the experimental data, the result indicates that the HAZ is the weakest zone across the weld and the strain localization in high cycle fatigue is very harmful and unpredictable for the FSW joints.
搅拌摩擦焊接6061铝合金在拉伸和高周疲劳下的非均匀变形
目的为优化6061-T6合金搅拌摩擦焊工艺以提高焊接接头的力学性能提供依据。设计/方法/方法利用数字图像相关(DIC)技术对FSW接头在拉伸和疲劳试验中的局部变形进行了实验研究。结果表明,无论是在拉伸还是高周疲劳中,塑性应变总是集中在前进侧的热影响区,最终导致断裂。塑性应变在非常低的应力下的演变非常缓慢,并且占总疲劳寿命的大部分。然而,就在疲劳失效之前,局部变形表现出突然增加。原创性/价值基于实验数据,结果表明HAZ是整个焊缝的最弱区域,高周疲劳中的应变局部化对FSW接头来说是非常有害和不可预测的。
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来源期刊
International Journal of Structural Integrity
International Journal of Structural Integrity ENGINEERING, MULTIDISCIPLINARY-
CiteScore
5.40
自引率
14.80%
发文量
42
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