Abstract
An analytical model is developed to predict fatigue crack propagation rate under mode I loading in 2024 aluminum alloy with FSW HAZ material characteristics. Simulation of the HAZ local properties in parent 2024 AA was performed with overaging using specific heat treatment conditions. The model considers local cyclic hardening behavior in the HAZ to analyze crack growth. For the evaluation of the model, the analytical results have been compared with experimental fatigue crack growth on overaged 2024 alloy simulating material behavior at different positions within the HAZ. The analytical results showed that cyclic hardening at the crack tip can be used successfully with the model to predict FCG in a material at overaged condition associated with a location in the FSW HAZ
Highlights
Fatigue crack growth rate (FCG) is influenced by several complex interactive processes that involve microstructural and mechanical load variables
Models used for analysis of crack growth rate under constant amplitude stress include a hierarchy of major simplifications, with most important being the application of the linear elastic fracture mechanics (LEFM) concept and are mainly empirical or semi-empirical because they rely on fitting experimental material crack growth data [e.g 1]
This is relevant in the case of the heat affected zone (HAZ) in a weld region, where the aged material consists of a modified microstructure with local material properties in the HAZ area
Summary
Fatigue crack growth rate (FCG) is influenced by several complex interactive processes that involve microstructural and mechanical load variables. Fatigue Crack Growth Analysis; Aluminum Alloy; Friction Stir Weld; Heat Affected Zone; Cyclic Hardening.
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