Technical note: Characteristic of fatigue changes of hardened and soft annealed aluminum alloy of AIMg5 type

摘要: Investigations weremade to evaluate the basic fatigue properties of an aluminum alloy (A1Mg5) in tests made on samples a thickness 2 mm. both hardened and annealed conditions (Appendix I). Surface microscopic observations were used as method investigation. The loss reserve material plasticity was observed by estimating hysteresis loop measuring strengthening rate function cycle number (Fig. 1-4 Appendix II). A generalized description damage deduced from results investigations. Two periods this process identified: (1) preliminary period generation deformations characterized appearance plastic displacements some grains major parts, (2) permanent spread progressive microcracks (loss cohesion) material. is considerable strengthening. In soft materials increase very intense particularly during first 1000 cycles. progress much lower clearly