@article{ref1,
title="A bilinear structural constitutive model for strain rate-dependent behaviour of human diaphragm tissue",
journal="International journal of crashworthiness",
year="2020",
author="Gaur, Piyush and Verma, Khyati and Chawla, Anoop and Mukherjee, Sudipto and Jain, Mohit and Mayer, Christian and Chitteti, Ravi Kiran and Ghosh, Pronoy and Malhotra, Rajesh and Lalvani, Sanjeev",
volume="25",
number="3",
pages="284-298",
abstract="Diaphragmatic rupture is the tear of the diaphragm muscle result from blunt or penetrating trauma and occurs in about 5% of cases of severe blunt trauma. Both finite element (FE) modelling and experimental testing have enhanced our understanding of the injury mechanisms associated with diaphragmatic rupture. A constitutive model for human diaphragm tissue is developed and implemented via user subroutine (UMAT) in LS Dyna that accounts for the strain rate-dependent effects and bilinear behaviour observed experimentally. To better understand the material properties of the human diaphragm, 16 dynamic tensile tests were conducted at three different strain rates of 65/s, 130/s and 190/s from six whole human diaphragms. The engineering stress-strain relationship obtained from these tests showed a bilinear behaviour and strain rate dependency. A strain rate-dependent bilinear stress-strain model was developed, and its parameters were optimised using a genetic algorithm-based inverse characterization method. The results demonstrate a good correlation between experiments and the model, with an average difference of 2 ± 2.8% (mean ± SD) between the optimised FE and experimental load-time curves. The material parameters found in this study can be used in dynamic simulations using FE models of diaphragm tissues.<p /> <p>Language: en</p>",
language="en",
issn="1358-8265",
doi="10.1080/13588265.2019.1583423",
url="http://dx.doi.org/10.1080/13588265.2019.1583423"
}