Study on Strengthening Mechanism and Anti-fatigue Performance of Stress Ultrasonic Rolling

doi:10.3901/JME.2024.09.127

Abstract

Abstract: The basic principle of coupling ultrasonic rolling with uniaxial tensile elastic stress field is discussed from the perspective of theoretical analysis, and the results of theoretical analysis are verified from the perspective of numerical simulation and experiment through finite element simulation and experimental characterization in turn. Thus, a new advanced surface mechanical strengthening process, stress ultrasonic rolling, is developed and successfully applied to enhance the surface mechanical strengthening effect and fatigue resistance of TiB2/2024 and TiB2/7050 aluminum matrix composites. Compared with ultrasonic rolling, the results showed that, after stress ultrasonic rolling, the peak compressive residual stresses in the surface layers of TiB2/2024 and TiB2/7050 aluminum matrix composites are increased by 45% and 70% of the applied uniaxial tensile elastic stress values, respectively, the depth of the layer affected by compressive residual stresses is increased by about 100 μm, and the fatigue limits of the two composite samples were further increased by 6% and 5%, respectively.

Key words: stress ultrasonic rolling, aluminum matrix composites, finite element simulation, experimental characterization, fatigue

CLC Number:

TG156

WU Jie, DANG Jiaqiang, LI Yugang, CHEN Dong, AN Qinglong, WANG Haowei, CHEN Ming. Study on Strengthening Mechanism and Anti-fatigue Performance of Stress Ultrasonic Rolling[J]. Journal of Mechanical Engineering, 2024, 60(9): 127-136.

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