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Mechanical Modeling and Simulation for the Take-Off and Landing Performance Calculation of Low-Cost UAVs Read chapter Read first chapter

2022 | OriginalPaper | Chapter

Fatigue Crack Growth Performance of Refilled Friction Stir Spot Welds in Similar and Dissimilar Aluminum Alloy Joints

Authors : Haiying Zhang, Binwen Wang, Gang Li, Wenkui Chang, Dengke Dong

Published in: Proceedings of the 5th China Aeronautical Science and Technology Conference

Publisher: Springer Singapore

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Abstract

Refilled friction stir spot weld (FSSW) is recognized as a potential replacement for riveting due to many advantages. For the application in aircraft structures, fatigue crack growth (FCG) behavior is essential to maintain structural integrity, and has been seldom reported up to now. In this work, FCG behaviors of similar and dissimilar refilled FSSW joints for typical aluminum alloy sheets were experimentally studied, and were compared with those of riveted joints. The mechanisms for the relevant phenomena were also investigated with the aid of fractography. The initial crack along the central line of the spot welds was found to tend to propagate straight through the weld in similar 2A12-T42 joints, while it was more likely to propagate along the periphery of the refilled stir zone in similar 2024-T3 joints. Due to finer grain in the stir zone and the “bridging effect” of the welds, FCG rate of both 2024-T3 and 7075-T62 refilled FSSW specimen was lower than that of base material or corresponding riveted specimen (before the crack propagated into the rivet hole). However, riveted specimen possessed longer fatigue life because the crack was stopped for a long test period when it grew into the rivet hole.

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Metadata
Title
Fatigue Crack Growth Performance of Refilled Friction Stir Spot Welds in Similar and Dissimilar Aluminum Alloy Joints
Authors
Haiying Zhang
Binwen Wang
Gang Li
Wenkui Chang
Dengke Dong
Copyright Year
2022
Publisher
Springer Singapore
Book
Proceedings of the 5th China Aeronautical Science and Technology Conference

Print ISBN: 978-981-16-7422-8

Electronic ISBN: 978-981-16-7423-5

Copyright Year: 2022

DOI
https://doi.org/10.1007/978-981-16-7423-5_22

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