Doctoral Dissertations

Abstract

"Finite element modeling framework based on cohesive damage modeling, constitutive material behavior using user-material subroutines, and extended finite element method (XFEM), are developed for studying the failure behavior of continuous fiber-reinforced ceramic matrix composites (CFCCs) by the example of a silicon carbide matrix reinforced with silicon carbide fiber (SiC/SiCf) composite. This work deals with developing comprehensive numerical models for three problems: (1) fiber/matrix interface debonding and fiber pull-out, (2) mechanical behavior of a CFCC using a representative volume element (RVE) approach, and (3) microstructure image-based modeling of a CFCC using object oriented finite element analysis (OOF). Load versus displacement behavior during a fiber pull-out event was investigated using a cohesive damage model and an artificial neural network model. Mechanical behavior of a CFCC was investigated using a statistically equivalent RVE. A three-step procedure was developed for generating a randomized fiber distribution. Elastic properties and damage behavior of a CFCC were analyzed using the developed RVE models. Scattering of strength distribution in CFCCs was taken into account using a Weibull probability law. A multi-scale modeling framework was developed for evaluating the fracture behavior of a CFCC as a function of microstructural attributes. A finite element mesh of the microstructure was generated using an OOF tool. XFEM was used to study crack propagation in the microstructure and the fracture behavior was analyzed. The work performed provides a valuable procedure for developing a multi-scale framework for comprehensive damage study of CFCCs"--Abstract, page iv.

Advisor(s)

Chandrashekhara, K.

Committee Member(s)

Dharani, Lokeswarappa R.
Birman, V. (Victor)
Hilmas, Greg
Samaranayake, V. A.

Department(s)

Mechanical and Aerospace Engineering

Degree Name

Ph. D. in Mechanical Engineering

Publisher

Missouri University of Science and Technology

Publication Date

2014

Journal article titles appearing in thesis/dissertation

  • Modeling of fiber pull-out in continuous fiber reinforced ceramic composites using finite element method and artificial neural networks
  • Computational study of micromechanical damage behavior in continuous fiber-reinforced ceramic composites
  • Microstructure image-based multi-scale modeling of fracture in continuous fiber-reinforced ceramic matrix composites

Pagination

xi, 130 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2014 Venkata Bheemreddy, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Fiber-reinforced ceramics -- TestingCeramic-matrix compositesFinite element methodContinuum damage mechanics -- Mathematical models

Thesis Number

T 10853

Electronic OCLC #

953972953

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