Multiscale Modeling on the Creep Analysis of Functionally Graded Cylinders under Mechanical and.....

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IJERTV10IS120097
Multiscale Modeling on the Creep Analysis of Functionally Graded Cylinders under Mechanical and Thermal Loads

Jasem A. Ahmed , Muhammad A. Wahab

This study attempts to develop a multiscale model to investigate the time-dependent creep behavior of functionally graded cylinders. With Finite Element (FE) simulations the position-dependent parameters associated with creep constitutive law at the microscale are evaluated. A non-linear boundary value problem is solved to determine the time-varying creep stresses and strains using a macroscopic FE model. The proposed work can predict the creep response of functionally graded pressure vessels based on the constitutive behavior of the creeping matrix (Aluminum with SiC (silicon carbide) inclusions), and volume fraction profiles. Three different micromechanical models have been used and the homogenized creep responses have been evaluated and its effect on the macroscopic behavior have been compared. It has been found that for large 3D-finite element models the computational expenses are enormous and the study shows that the simple 2D-axisymmetric model can closely capture the creep behavior of such multiscale methods. It has been found that the radial variations of constituent volume fractions have significant effects on stress distributions and creep strain histories. The models are useful to investigate materials combinations and heterogeneity profiles. The creep strain can be controlled by adjusting the volume fraction profiles.