Theoretic and Experimental Fatigue Analysis of Off-axis Unidirectional Rubbery Composites Using Nonlinear Life Prediction Model

Document Type : Research Article

Authors

1 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran

2 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran.

Abstract

The aim of this article is analyzing the fatigue behavior of off-axis unidirectional rubbery composites under uniaxial tension-tension cyclic loading based on the developed damage-entropy model. The main advantage of the damage-entropy model is that it accounts for the viscoelastic property and temperature increase during the fatigue loading conditions. The off-axis rubbery composite lay-ups exhibit a nonlinear stress-strain response similar to the rubber matrix. Hence, the Newton-Raphson method is employed to capture the nonlinear behaviour of rubbery composites in this study. The failure criterion in the damage-entropy model is based on the fracture fatigue entropy value. To characterize the longitudinal, transverse, and in-plane shear behaviour of rubbery composites, static and fatigue experimental tests on different lay-ups are conducted. Moreover, the damage energy, the energy dissipation due to viscoelastic behaviour and the heat transfer to the environment during the fatigue loading will be calculated. Furthermore, the experimental results of [45]4 lay-up are utilized to validate the developed damage-entropy model. Finally, the experimental and modelling results of hysteresis energy, temperature change, and fatigue life of steel-cord rubber composite [45]4 lay-up for different stress levels subjected to stress ratio 0.1 and 1 Hz frequency, are compared. The comparison between the analytical results and experiments indicates the capabilities of the present model.

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Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 56, Issue 4
2024
Pages 567-594

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