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자료유형
학술저널
저자정보
Wenguang Li (Univ. of Glasgow)
저널정보
대한의용생체공학회 Biomedical Engineering Letters (BMEL) Biomedical Engineering Letters (BMEL) Vol.9 No.2
발행연도
2019.1
수록면
189 - 201 (13page)

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Biomechanical properties of human gallbladder (GB) wall in passive state can be valuable to diagnosis of GB diseases. In the article, an approach for identifying damage eff ect in GB walls during uniaxial tensile test was proposed and a strainenergy function with the damage eff ect was devised as a constitutive law phenomenologically. Scalar damage variables wereintroduced respectively into the matrix and two families of fi bres to assess the damage degree in GB walls. The parametersin the constitutive law with the damage eff ect were determined with a custom MATLAB code based on two sets of existinguniaxial tensile test data on human and porcine GB walls in passive state. It turned out that the uniaxial tensile test datafor GB walls could not be fi tted properly by using the existing strain energy function without the damage eff ect, but couldbe done by means of the proposed strain energy function with the damage eff ect involved. The stresses and Young modulideveloped in two families of fi bres were more than thousands higher than the stresses and Young’s moduli in the matrix. According to the damage variables estimated, the damage eff ect occurred in two families of fi bres only. Once the damageoccurs, the value of the strain energy function will decrease. The proposed constitutive laws are meaningful for fi nite elementanalysis on human GB walls.

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