Effects of Different R Ratios on Fatigue Crack Growth in Laser Peened Friction Stir Welds

Omar Hatamleh; Lloyd Hackel; Scott Forth

doi:10.4028/www.scientific.net/MSF.580-582.675

Paper Titles

Development of Non-Equilibrium Simulation Model of Gas Tungsten Arc
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Fatigue Damage Model for Numerical Assessment of Fatigue Characteristics
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Study of Weldability for Circularly Input Heat
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Investigation of Soundness of Welds in Welding under Static and Cyclic Loading
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Effects of Different R Ratios on Fatigue Crack Growth in Laser Peened Friction Stir Welds
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The Variations of Quality Characteristics According to Environmental Factors of High Tension Bolt, Nut and Washer Set
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The Influence on the Axial Force by the Size Scattering of High Tension Bolt, Nut and Washer Sets
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Reconfigurable 3D Laser-Stripe Sensor for Welding Processes
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A Study on the Factors Affecting the Formability of TMCP Steel for Curved Hull Plate
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HomeMaterials Science ForumMaterials Science Forum Vols. 580-582Effects of Different R Ratios on Fatigue Crack...

Effects of Different R Ratios on Fatigue Crack Growth in Laser Peened Friction Stir Welds

Abstract:

The influence of laser peening on the fatigue crack growth behavior of friction stir welded (FSW) Aluminum Alloy (AA) 7075-T7351 sheets was investigated. The surface modification resulting from the peening process on the fatigue crack growth of FSW was assessed for two different R ratios. The investigation indicated a significant decrease in fatigue crack growth rates resulting from using laser shock peening compared with unpeened, welded and unwelded specimens. The slower fatigue crack growth rate was attributed to the compressive residual stresses induced by the peening.