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<p>Laser shock peening (LSP) is widely applied to the leading edge of aero-engine compressor blades to enhance their resistance to foreign object damage. However, the variable thickness characteristics of the leading edge complicate the residual stress distribution induced by LSP, making it challenging to be accurately characterized. To address this issue, an efficient simulation method for reconstructing the full-field residual stress distribution in LSP structures with variable thickness representing the leading edge of blades is proposed in this study. Firstly, double-sided LSP treatment was conducted on a set of TC4 titanium alloy plates with different thicknesses as well as on the leading edge specimens. Based on x-ray diffraction measurements, the influence of thickness-related geometric features on the efficacy of double-sided LSP was systematically investigated in terms of the distribution of residual stresses. Subsequently, a thickness-dependent eigenstrain model was established, which can be applied to reconstruct the residual stress distribution in specimens with different thicknesses. Additionally, the full-field residual stress distribution in the leading edge specimen was also successfully reconstructed using the proposed eigenstrain model, without the requirement of applying destructive measurements on it.</p>

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An Eigenstrain-Based Full-Field Residual Stress Reconstruction Method Applied for Laser Shock Peened Titanium Alloy Blades

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Yuhui Fan,
  • Chao You,
  • Sihai Luo,
  • Yi Cheng,
  • Daiyang Gao,
  • Rong Jiang,
  • Yingdong Song

摘要

Laser shock peening (LSP) is widely applied to the leading edge of aero-engine compressor blades to enhance their resistance to foreign object damage. However, the variable thickness characteristics of the leading edge complicate the residual stress distribution induced by LSP, making it challenging to be accurately characterized. To address this issue, an efficient simulation method for reconstructing the full-field residual stress distribution in LSP structures with variable thickness representing the leading edge of blades is proposed in this study. Firstly, double-sided LSP treatment was conducted on a set of TC4 titanium alloy plates with different thicknesses as well as on the leading edge specimens. Based on x-ray diffraction measurements, the influence of thickness-related geometric features on the efficacy of double-sided LSP was systematically investigated in terms of the distribution of residual stresses. Subsequently, a thickness-dependent eigenstrain model was established, which can be applied to reconstruct the residual stress distribution in specimens with different thicknesses. Additionally, the full-field residual stress distribution in the leading edge specimen was also successfully reconstructed using the proposed eigenstrain model, without the requirement of applying destructive measurements on it.