Estimation of Fatigue life of Cortical Bone Considering Viscoelastic Properties and Damage Mechanics

2011 ◽  
pp. 289-294
Author(s):  
Takenobu Sakai ◽  
Keita Yasui ◽  
Shuichi Wakayama
Keyword(s):  
Fatigue Life ◽  
Cortical Bone ◽  
Viscoelastic Properties ◽  
Damage Mechanics

Prediction of Asphalt Mix Fatigue Life with Viscoelastic Material Properties

2003 ◽  
Vol 1832 (1) ◽  
pp. 139-147 ◽  
Author(s):  
Hyun Lee ◽  
Y. Richard Kim ◽  
Seung Lee
Keyword(s):  
Fatigue Life ◽  
Viscoelastic Material ◽  
Material Properties ◽  
Viscoelastic Properties ◽  
Damage Mechanics ◽  
Fatigue Behavior ◽  
Continuum Damage Mechanics ◽  
Asphalt Mixes ◽  
Fatigue Model ◽  
Asphalt Mix

A simplified fatigue model is presented that can predict the fatigue life of asphalt mixes using viscoelastic properties only. This fatigue model was originally developed with the elastic-viscoelastic correspondence principle and continuum damage mechanics and was reduced to a simple version that can predict fatigue life with viscoelastic properties only. On the basis of the experimental study conducted on 12 different types of asphalt mixes, it was observed that the fatigue behavior of asphalt mixes is affected by both the viscoelastic properties and the fatigue characteristics, but mostly by the viscoelastic properties. In addition, it was found that the coefficient of conventional strain-based fatigue models could be expressed in terms of viscoelastic material properties. In the verification study, the fatigue model was able to predict the fatigue life of various types of mixes at the same level of prediction accuracy without change in model coefficients. The fatigue model was also able to accurately predict the changes in the fatigue life of an asphalt mix due to the changes in the volumetric mix properties.

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.

Viscoelastic properties of wet cortical bone—II. Relaxation mechanisms

1979 ◽  
Vol 12 (9) ◽  
pp. 679-687 ◽  
Author(s):  
Roderic S. Lakes ◽  
J.Lawrence Katz
Keyword(s):  
Cortical Bone ◽  
Viscoelastic Properties

A Continuum Damage Mechanics Model Of The Microdamage Process Zone During Cortical Bone Fracture

2019 ◽  
Vol 7 ◽  
pp. 402-409
Author(s):  
Daniel Dapaah ◽  
Aram Bahmani ◽  
John Montesano ◽  
Thomas L. Willett
Keyword(s):  
Cortical Bone ◽  
Bone Fracture ◽  
Damage Mechanics ◽  
Process Zone ◽  
Continuum Damage Mechanics ◽  
Continuum Damage ◽  
Mechanics Model

Effect of laser shock peening on fatigue life and surface characteristics of stainless steel cortical bone screws

2004 ◽  
Vol 65 (7) ◽  
pp. 972-976 ◽  
Author(s):  
Christopher B. O'Sullivan ◽  
Alicia L. Bertone ◽  
Alan S. Litsky ◽  
James T. Robertson
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Cortical Bone ◽  
Surface Characteristics ◽  
Bone Screws ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening
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