A Coupled Uncoupled Computational Scheme For Deformation And Fatigue Damage Analysis Of Unidirectional Metal Matrix Composites
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Author | : TE. Wilt |
Publisher | : |
Total Pages | : 18 |
Release | : 1997 |
Genre | : Continuum damage mechanics |
ISBN | : |
A fatigue damage computational algorithm utilizing a multiaxial, isothermal, continuum-based fatigue damage model for unidirectional metal-matrix composites has been implemented into the commercial finite element code MARC using MARC user subroutines. Damage is introduced into the finite element solution through the concept of effective stress that fully couples the fatigue damage calculations with the finite element deformation solution. Two applications using the fatigue damage algorithm are presented. First, an axisymmetric stress analysis of a circumferentially reinforced ring, wherein both the matrix cladding and the composite core were assumed to behave elastic-perfectly plastic. Second, a micromechanics analysis of a fiber/matrix unit cell using both the finite element method and the generalized method of cells (GMC). Results are presented in the form of S-N curves and damage distribution plots.
Author | : David L. McDowell |
Publisher | : ASTM International |
Total Pages | : 238 |
Release | : 1997 |
Genre | : Composite materials |
ISBN | : 0803124732 |
Contains papers from the May 1996 Symposium on Applications of Continuum Damage Mechanics (CDM) to Fatigue and Fracture. Papers in Section I deal with various aspects of modeling damage in composite materials, such as high temperature environmental degradation, fatigue, and viscous damage in metal a
Author | : Jacob Aboudi |
Publisher | : Butterworth-Heinemann |
Total Pages | : 1032 |
Release | : 2013 |
Genre | : Technology & Engineering |
ISBN | : 0123970350 |
Summary: A Generalized Multiscale Analysis Approach brings together comprehensive background information on the multiscale nature of the composite, constituent material behaviour, damage models and key techniques for multiscale modelling, as well as presenting the findings and methods, developed over a lifetime's research, of three leading experts in the field. The unified approach presented in the book for conducting multiscale analysis and design of conventional and smart composite materials is also applicable for structures with complete linear and nonlinear material behavior, with numerous applications provided to illustrate use. Modeling composite behaviour is a key challenge in research and industry; when done efficiently and reliably it can save money, decrease time to market with new innovations and prevent component failure.
Author | : |
Publisher | : |
Total Pages | : 36 |
Release | : 2001 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 1048 |
Release | : 1999 |
Genre | : Aeronautics |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 392 |
Release | : 1994 |
Genre | : Aeronautics |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 42 |
Release | : 2000 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 1076 |
Release | : 1998 |
Genre | : Metallurgy |
ISBN | : |
Author | : GZ. Voyiadjis |
Publisher | : |
Total Pages | : 19 |
Release | : 1997 |
Genre | : Continuum damage mechanics |
ISBN | : |
Improvements in design and the enhancement in performance of aerospace vehicles calls for the development of advanced materials capable of sustaining the increasing loading conditions while maintaining their structural integrity. Special consideration must be given to the behavior of such materials under fatigue loading conditions that dominate the flight regime loads. A micromechanical fatigue damage model for unidirectional metal-matrix composites is proposed. Damage evolution is considered at the constituent level through the application of the Mori-Tanaka averaging scheme. Individual damage criteria for the constituents are proposed and employed to define damage evolution equations for each of the consultants. The numerical results for high cycle fatigue loading are presented for variations in the material and model parameters.
Author | : |
Publisher | : |
Total Pages | : 28 |
Release | : 1995 |
Genre | : |
ISBN | : |
A life prediction model is being developed by the authors for application to metal matrix composites (MMC's). The systems under study are continuous silicon carbide fibers imbedded in titanium matrix. The model utilizes a computationally based framework based on thermodynamics and continuum mechanics, and accounts for matrix inelasticity, damage evolution, and environmental degradation due to oxidation. The computational model utilizes the finite element method, and an evolutionary analysis of a unit cell is accomplished via a time stepping algorithm. The computational scheme accounts for damage growth such as fiber-matrix debonding, surface cracking, and matrix cracking via the inclusion of cohesive zone elements in the unit cell. These elements are located based on experimental evidence also obtained by the authors. The current paper outlines the formulation utilized by the authors to solve this problem, and recent results are discussed. Specifically, results are given for a four-ply unidirectional composite subjected to cyclic fatigue loading at 650°C both in air and inert gas. The effects of oxidation on the life of the composite are predicted with the model, and the results are compared to limited experimental results.