Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
In this study, fatigue properties were investigated using joints made by friction stir welding to two types of rolled aluminum alloys, AA6111-T4 and AA5052-H34. Microstructural observation showed that the crystal grains in the joint were finer than those in the base metal. The results of Vickers hardness tests showed a decrease in hardness around the joint, which was attributed to annealing caused by frictional heat during joining. Static test results showed that the tensile strength of each joint was much lower than the tensile strength of the base metal, confirming that failure occurred from the upper plate joint. In fatigue tests, a difference in fatigue life of each joint was observed below a certain test force amplitude, and a higher fatigue life was observed in the joint with AA6111 as the upper plate. The fatigue crack propagated from the tip of the slit toward the upper plate, reached the top surface of the joint, and ruptured the joint.
