Investigation on welding residual stress effects on modal parameters on AA5056 samples; an experimental and numerical study
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MajidiRad, AmirHossein. 2017. Investigation on welding residual stress effects on modal parameters on AA5056 samples; an experimental and numerical study--In Proceedings: 13th Annual Symposium on Graduate Research and Scholarly Projects. Wichita, KS: Wichita State University, p.55
Most manufacturing processes introduce some type of residual stress. Unlike some types of residual stress measurement tests that are mostly time-consuming and expensive, modal analysis is a suitable substitute that can investigate this procedure efficiently. In this project, experimental modal analysis was conducted along with a semi-destructive residual stress measurement technique (Center Hole Drilling) to demonstrate the relation between vibrational parameters and welding residual stresses. A comparison was made between natural frequencies and damping factors before and after the welding, and the experiment was validated by Euler-Bernoulli relations too. Finite element analysis of the welding, cutting and stress/modal analysis procedures was performed and the results reveal that welding residual stresses made the specimen harder, leading to a 2% increase in natural frequencies and variations in damping factors. Cutting process also reduced the residual stress level by up to 34%. This case study could be beneficial to applications where residual stress measurement is not convenient.
Presented to the 13th Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Rhatigan Student Center, Wichita State University, April 28, 2017.
Research completed in the Department of Mechanical Engineering, College of Engineering