Modeling of long-term fatigue damage of soft tissue with stress softening and permanent set effects

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• 作者：Caitlin Martin (1)
  Wei Sun (1)
  
• 关键词：Soft tissue fatigue model ; Permanent set ; Stress softening ; Bioprosthetic heart valve
• 刊名：Biomechanics and Modeling in Mechanobiology
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：12
• 期：4
• 页码：645-655
• 全文大小：841KB
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• 作者单位：Caitlin Martin (1)
  Wei Sun (1)
  
  1. Tissue Mechanics Laboratory, Biomedical Engineering Program and Mechanical Engineering Department, University of Connecticut, 207 Bronwell Building, Storrs, CT, 06269-3139, USA
  

文摘

One of the major failure modes of bioprosthetic heart valves is non-calcific structural deterioration due to fatigue of the tissue leaflets. Experimental methods to characterize tissue fatigue properties are complex and time-consuming. A constitutive fatigue model that could be calibrated by isolated material tests would be ideal for investigating the effects of more complex loading conditions. However, there is a lack of tissue fatigue damage models in the literature. To address these limitations, in this study, a phenomenological constitutive model was developed to describe the stress softening and permanent set effects of tissue subjected to long-term cyclic loading. The model was used to capture characteristic uniaxial fatigue data for glutaraldehyde-treated bovine pericardium and was then implemented into finite element software. The simulated fatigue response agreed well with the experimental data and thus demonstrates feasibility of this approach.