TY  - JOUR
PY  - 2020//
TI  - A bilinear structural constitutive model for strain rate-dependent behaviour of human diaphragm tissue
JO  - International journal of crashworthiness
A1  - Gaur, Piyush
A1  - Verma, Khyati
A1  - Chawla, Anoop
A1  - Mukherjee, Sudipto
A1  - Jain, Mohit
A1  - Mayer, Christian
A1  - Chitteti, Ravi Kiran
A1  - Ghosh, Pronoy
A1  - Malhotra, Rajesh
A1  - Lalvani, Sanjeev
SP  - 284
EP  - 298
VL  - 25
IS  - 3
N2  - 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>
LA  - en
SN  - 1358-8265
UR  - http://dx.doi.org/10.1080/13588265.2019.1583423
ID  - ref1
ER  -