#7483. Analysis of residual stress relaxation of aluminum alloys EN AW 6061/-82 T6 under cyclic loading

October 2026publication date
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Journal’s subject area:
Mechanical Engineering;
Mechanics of Materials;
Materials Science (all);
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Abstract:
Stress relaxation describes the reduction of stress under static or cyclic loading at a constant strain level. Several processes induce intentionally residual stresses, for example, autofrettage of thick-walled pressurized tubes to improve their fatigue life. This well-known process induces residual compressive stresses at the critical inner surface by using a single static but controlled overloading internal pressure. Relaxation of residual stresses due to cyclic loading in service would endanger the effectiveness of autofrettage and could finally lead to unexpected fatigue failure.
Keywords:
aluminum alloys; autofrettage; cyclic loading; EN AW 6061 T6; EN AW 6082 T6; four-point bending; residual stress; stress relaxation

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