Abstract
Abstract The low cycle fatigue behavior of AA2219-T87 was studied at ambient temperature using fully reversed total strain controlled fatigue tests in longitudinal and transverse orientations. Tension-compression cyclic tests were carried out under total strain amplitude control with strain ratio Rε = −1 and at a frequency of 0.5 Hz. The total strain amplitude was varied from ±0.4 to ±1.5 %. The low cycle fatigue results were analyzed to determine the cyclic stress strain curves. The cyclic strain hardening parameters were evaluated from the cyclic stress–strain curves. Important fatigue parameters namely fatigue ductility coefficient, fatigue ductility exponent, and fatigue strength coefficient were evaluated. The material exhibited cyclic strain softening in both longitudinal and transverse directions. Analysis of the experimental results showed that the stress–strain hysteresis loops exhibited inflections in the first few cycles and the plastic strain amplitude versus fatigue-life plots exhibited bi-linear relationship. The geometry of hysteresis loops and the occurrence of Masing behavior are analyzed and found that the alloy in peak aged condition exhibited tendency towards Masing behavior.
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