Our Work

The effects of laser peening and shot peening on high cycle fatigue in 7050-T7451 aluminum alloy

The high cycle fatigue performance of 7050-T7451 aluminum was investigated for untreated as-machined, laser peened, and shot peened conditions. Constant amplitude, smooth (Kt=1) fatigue tests were conducted in four-point bending at a stress ratio of R=0.1. Results show that laser peening induces a layer of compressive residual stress more than three times deeper than for shot peening. Both treatments significantly increase fatigue performance.

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Case studies

Residual Stress Field Team TrueSlot® – near surface residual stress measurement ExpressRS® – expedited residual stress results Strain Gaging Services Residual Stress DART – automated residual stress measurement Mechanical stress relief of aluminum alloys Rapid Forge Design Aluminum forging quench modeling Machining distortion modeling with multi-step models including residual stress

Technical Publications

Measurement-driven, model-based estimation of residual stress and its effect on fatigue crack growth. Part 2: fatigue crack growth testing and modeling Measurement-driven, model-based estimation of residual stress and its effects on fatigue crack growth. Part 1: validation of an eigenstrain model Near Surface Residual Stress Measurement Using Slotting Measurement Layout for Residual Stress Mapping Using Slitting Precision of Hole-Drilling Residual Stress Depth Profile Measurements and an Updated Uncertainty Estimator An Uncertainty Estimator for Slitting Method Residual Stress Measurements Including the Influence of Regularization Validation of a Contour Method Single-Measurement Uncertainty Estimator Repeatability of Contour Method Residual Stress Measurements for a Range of Materials, Processes, and Geometries PSR Biaxial Residual Stress Mapping Validation The Contour Method (book chapter)