Flexural Bending and Fatigue Analysis of Functionally Graded Viscoelastic Materials: Experimental and Numerical Approaches

E.K. Njim; S.E. Sadiq; M.S. Al-Din Tahir; M.A. Flayyih; L. Hadji

doi:10.15330/pcss.24.4.628-639

Authors

E.K. Njim Ministry of Industry and Minerals, State Company for Rubber and Tires Industries, Iraq
S.E. Sadiq Department of Aeronautical Technical Engineering, Technical Engineering College of Najaf, Al-Furat Al-Awsat Technical University, Iraq
M.S. Al-Din Tahir Department of Computer Engineering Technology, Faculty of Information Technology, Imam Ja’afar Al-sadiq University, Iraq
M.A. Flayyih Biomedical Engineering Department, College of Engineering and Technologies, Al-Mustaqbal University, Hillah, Iraq
L. Hadji Department of Mechanical Engineering, University of Tiaret, Tiaret, Algeria

DOI:

https://doi.org/10.15330/pcss.24.4.628-639

Keywords:

FGM, Polymeric materials, Mechanical Behavior, Fatigue, FEA

Abstract

This work synthesized a thermoplastic polymer with varying densities along one direction using additive manufacturing technology to study the dynamic and static characteristics of functionally graded viscoelastic materials (FGVMs). To describe the mechanical properties of FGVMs, an analytical formulation based on the sigmoid-law formulation was proposed. The experimental program is conducted on 3D-printed samples, and various tests are conducted to examine the performance of such materials. Furthermore, the finite element method was used to evaluate the structural system's flexural properties. The influences of FG parameters and geometrical properties on flexural and reverse bending fatigue life are analyzed. The results show that increasing porosity from 10% to 30% at a power-law index (k = 2) reduces bending strength by 31.25 percent and deflection by around 11.2 percent for VE samples. Changing the power-law exponent from 0.5 to 10 increases fatigue strength by 35 %.

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