Damage Formulation of Random Particulate Composites by Combined Micromechanics and Damage Mechanics

2003 ◽  
Vol 2003.78 (0) ◽  
pp. _2-27_-_2-28_
Author(s):  
Akihiro WADA ◽  
Shinya MOTOGI
Keyword(s):  
Damage Mechanics ◽  
Particulate Composites ◽  
Damage Formulation

Modeling and Simulation of Crack Initiation and Growth in Particulate Composites

1997 ◽  
Vol 119 (3) ◽  
pp. 319-324 ◽  
Author(s):  
Y. W. Kwon ◽  
J. H. Lee ◽  
C. T. Liu
Keyword(s):  
Crack Initiation ◽  
Modeling And Simulation ◽  
Composite Structures ◽  
Damage Mechanics ◽  
Damage Zone ◽  
Micromechanical Model ◽  
Particulate Composite ◽  
Computational Effort ◽  
Particulate Composites ◽  
Initiation And Propagation

A micro/macromechanical approach was used to model and simulate crack initiation and crack propagation in particulate composite structures. The approach used both the micromechanical and macromechanical analyses in tandem. The micromechanical analysis was based on a simplified micromechanical model and damage mechanics at the micro-level, and the macromechanical analysis utilized the finite element method. In using these methods, crack initiation and growth in a general shape of composite structure were investigated with an efficient computational effort. It was assumed that a crack initiates and/or propagates when localized damage is saturated. As a result, the crack length was assumed to be the size of the saturated damage zone. Matrix crack initiation and propagation at circular notch tips were simulated using this approach. Modeling and simulation were also conducted for cases of nonuniform particle distribution in particulate composite structures. Predicted results showed a good agreement with the experimental data.

Fatigue Life of the Human Teeth: A Continuum Damage Approach

2019 ◽  
Vol 43 ◽  
pp. 1-19
Author(s):  
Theddeus Tochukwu Akano
Keyword(s):  
Fatigue Life ◽  
Damage Mechanics ◽  
Stress Amplitude ◽  
Continuum Damage Mechanics ◽  
Continuum Damage ◽  
Elastoplastic Model ◽  
Human Teeth ◽  
Proposed Model ◽  
Number Of Cycles ◽  
Cycles To Failure

Normal oral food ingestion processes such as mastication would not have been possible without the teeth. The human teeth are subjected to many cyclic loadings per day. This, in turn, exerts forces on the teeth just like an engineering material undergoing the same cyclic loading. Over a period, there will be the creation of microcracks on the teeth that might not be visible ab initio. The constant formation of these microcracks weakens the teeth structure and foundation that result in its fracture. Therefore, the need to predict the fatigue life for human teeth is essential. In this paper, a continuum damage mechanics (CDM) based model is employed to evaluate the fatigue life of the human teeth. The material characteristic of the teeth is captured within the framework of the elastoplastic model. By applying the damage evolution equivalence, a mathematical formula is developed that describes the fatigue life in terms of the stress amplitude. Existing experimental data served as a guide as to the completeness of the proposed model. Results as a function of age and tubule orientation are presented. The outcomes produced by the current study have substantial agreement with the experimental results when plotted on the same axes. There is a notable difference in the number of cycles to failure as the tubule orientation increases. It is also revealed that the developed model could forecast for any tubule orientation and be adopted for both young and old teeth.

Sign in / Sign up

Export Citation Format

Share Document