Journal
THEORETICAL AND APPLIED FRACTURE MECHANICS
Volume 119, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.tafmec.2022.103358
Keywords
Laser shock peening; Residual stress; Mixed-mode fatigue crack propagation; 7075-T6 aluminum alloy panel
Categories
Funding
- National Natural Science Foundation of China [91860128, 12032018, 52061135101]
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The study investigated the effects of residual stress on mixed-mode crack propagation behavior of 7075-T6 aluminum alloy panel subject to multiple laser shock peening (LSP) impacts. It was found that residual stress can change the crack path and delay the crack propagation. Additionally, increasing the LSP coverage area and reducing the distance from the treated area to the crack tip can improve fatigue performance.
The effects of residual stress on mixed-mode crack propagation behavior of 7075-T6 aluminum alloy panel subject to multiple laser shock peening (LSP) impacts were investigated. Residual stress was obtained by an efficient LSP simulation termed continuous explicit-dynamic impact strategy. A numerical method, combining finite element (FE) method and residual stress intensity factor (SIF) analysis, was used to predict the mixed-mode (I/II) crack propagation in peened compact tension shear (CTS) sample. The effects of residual stress on the mixed-mode crack behaviors in different coverage areas were analyzed. It was found that the LSP-induced residual stress can change the crack path. Compressive residual stresses increase the effective crack length, and delay the crack propagation. The increased LSP coverage area and the decreased distance from the treated area to the crack tip are beneficial to the fatigue performance. The obvious crack turning point near the peened area is related to the significant change of mode II SIF components (KloadII and KresII ). The proposed numerical method provides a new idea for the damage tolerance analysis with respect to the applications of LSP technology in aircraft structures.
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