Micromechanic Failure Analysis of Carbon/Phenolic Composite Conic Structures under Thermal Loading

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Hodaei Esfahani, Mohammad Ali | 2020

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 53487 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Hosseini Kordkheili, Ali
Abstract:
In this study, through explaining a micromechanical model of progressive damage, failure in a composite conical structure under mechanical and thermal loads with 36 layers of carbon/phenolic material have been studied. To this end, first, mechanical behaviors of composite layers in micro and macro scale and their properties via fiber and matrix characterizations are discussed. In the following, selection of a proper RVE along with different types of boundary conditions on RVE are discussed. Then stress reinforcement coefficients in order to convert the mechanical and thermal stresses from macro to micro scale for carbon / phenolic material are extracted through defining appropriate RVE for the structure. Then with the introduction of progressive failure process and explanation of failure criteria for fibers and matrix, micromechanical failure algorithm is formed. The algorithm is coded with Python language and runs with a suitable subroutine in Abaqus software. Through implementation of this algorithm failure procedure in composite conical structure under mechanical and thermal loads is evaluated and discussed
Keywords:
Micromechanical Model ; Representative Volume Element ; Carbon/Phenolic ; Thermal Load ; Progressive Failure Analysis ; Composite Structures

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