Structural Technology Evaluation Analysis Program (STEAP). Task Order 0029: Thermal Stability of Fatigue Life-Enhanced Structures
Abstract
This work combines process parameter variations, finite element (FE) modeling and simulations, characterization, and mechanical testing in a study of the effects of laser shock peening (LSP) on residual stress and microstructure evolution, thermal stability thereof, and fatigue behavior of high-temperature aerospace structural alloys ( Ti-64, Ti-6242, IN718 SPF and IN718 Plus). The aim was to secure a quantified knowledge of the impact of process parameters and high-temperature exposures on the stability of residual stress, microstructure, and fatigue properties in laser peened high-temperature structural alloys. The results show that LSP induces deep compressive residual stresses and near-surface plasticity and hardening that are quite stable to relatively high temperatures specific for each alloy. Good agreement between experimental and FE simulation results for LSP-induced residual stress and thermal relaxation behavior was obtained. The various project results have shown that advanced surface treatments, such as LSP, can be effective for enhancing the fatigue life and the thermal stability of fatigue life in high-temperature aerospace structural alloys.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2012
- Accession Number
- ADA560732
Entities
People
- Amrinder Gill
- Dong Qian
- Gokul Ramakrishnan
- S. R. Mannava
- Sagar Bhamare
- Vibhor Chaswal
- Vijay K. Vasudevan
- Zhong Zhou
Organizations
- University of Cincinnati