EXPERIMENTAL STUDY OF FATIGUE LIFE AND RESIDUAL STRESSES AFTER FRICTION STIR HOLE EXPANSION IN ALUMINUM ALLOY D16AT

Galya Velikova Duncheva
Department of Applied Mechanics, Technical university of Gabrovo / Bulgaria

Abstract

This paper presents the outcomes from experimental study of fatigue life and residual hoop stresses after Friction Stir Hole Expasion (FSHE). FSHE is directed to fatigue life enhancement of structural components with holes in aluminum alloys. The object of study is high-strength aluminum alloy D16AT. The fatigue life has been estimated trough fatigue tests upon a testing machine Instron -1332. The residual hoop stresses after FSHE have been measured by non-destructive method X-ray diffraction. The outcomes obtained confirm that the FSHE process is more effective when it is implemented with a relatively smaller rotating speed with lubrication

Keywords

Friction Stir Hole Expansion, experimental study, aluminum alloy D16AT; fatigue tests, residual hoop stresses

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