Modeling liver parenchyma tearing using a cohesive zone modeling approach

Abstract eng:
Samma Q. The rapid advancement in computational power has made human finite element (FE) models one of the most efficient tools for assessing the risk of abdominal injuries in a crash event. In this study, specimen-specific FE models were employed to quantify material and failure properties of human liver parenchyma. First, the pre-tearing region of each coupon test was simulated and the parameters of a hyper- elastic material model were identified by FE optimization. Then, the tissue tearing was numerically simulated using a cohesive zone modeling (CZM) approach. The results show that the proposed approach is able to capture both the biomechanical and failure response, and accurately model the overall force— deflection response of liver parenchyma over a large range of tensile loadings rates.

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