Evaluation of cyclic plasticity models of multi-surface and non-linear hardening by an energy-based fatigue criterion

Abstract

This study examines the performance of four constitutive models according to capacity in predicting metal fatigue life under proportional and non-proportional loading conditions. These cyclic plasticity models are the multi-surface models of Mroz and Garud, and the non-linear kinematic hardening models of Armstrong-Frederick and Chaboche. The range of abilities of these models is studied in detail. Furthermore, the plastic strain energy under multiaxial fatigue condition is calculated in the cyclic plasticity models by the stress-strain hysteresis loops. Using the results of these models, the fatigue lives that have set in the energy-based fatigue model are predicted and evaluated with the reported experimental data of 1% Cr-Mo-V steel in the literature. Consequently, the optimum model in the loading condition for this metal is chosen based on life factor.

Modelado del estrés termo-mecánico en películas finas de La(Fe,Co,Si)13 depositadas en estructuras porosas

“…En particular, la aleación de material La(Fe,Co,Si)13 posee un efecto magnetocalórico considerable, una temperatura de Curie o de transición manejable en el rango de 250K a 340K, además de una relativamente buena estabilidad mecánica en fatiga [13] [14] [15]. Para la evaluación del esfuerzo termo-mecánico, se utiliza software comercial con el método de análisis por elementos finitos, donde se modela el comportamiento del regenerador magnetocalórico como un material con propiedades visco-plásticas [16] [17]. La resistencia a fatiga (ciclos necesarios para falla) del material se calcula usando el modelo de Morrow para energía disipada en volúmenes definidos.…”

Evaluation of plastic strain work and multiaxial fatigue life in CuZn37 alloy by means of thermography method and energy‐based approaches of Ellyin and Garud

“…Unfortunately, these models are quite complex, and a number of material parameters have to be determined . In the case of non‐proportional loadings, the classical cyclic plasticity models do not work properly . Modifications of these models due to non‐proportionality of loading lead to even higher complexity and even more required material parameters …”

“…[22][23][24] In the case of non-proportional loadings, the classical cyclic plasticity models do not work properly. 25,26 Modifications of these models due to non-proportionality of loading lead to even higher complexity and even more required material parameters. 23 The question arises: can experimental methods, other than the measurement of strain or force, be used for the calculation of FDP in a low-cycle fatigue range for a real object?…”