User-material for: "A biophysically guided constitutive law of the musculotendon-complex: modelling and numerical implementation in Abaqus" (doi:10.18419/darus-2229)

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User-material for: "A biophysically guided constitutive law of the musculotendon-complex: modelling and numerical implementation in Abaqus"

doi:10.18419/darus-2229

DaRUS

2022-09-28

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Saini, Harnoor, 2022, "User-material for: "A biophysically guided constitutive law of the musculotendon-complex: modelling and numerical implementation in Abaqus"", https://doi.org/10.18419/darus-2229, DaRUS, V1

User-material for: "A biophysically guided constitutive law of the musculotendon-complex: modelling and numerical implementation in Abaqus"

doi:10.18419/darus-2229

Saini, Harnoor (Universität Stuttgart)

GRK2198

01EC1907B

DaRUS

Saini, Harnoor

Saini, Harnoor Deep Singh

2021-11-08

https://doi.org/10.18419/darus-2229

Engineering, Skeletal Muscle

Background and Objective: Many biomedical, clinical, and industrial applications may benefit from musculoskeletal simulations. Three-dimensional macroscopic muscle models (3D models) can more accurately represent muscle architecture than their 1D (line-segment) counterparts. Nevertheless, 3D models remain underutilised in academic, clinical, and commercial environments. Among the reasons for this is a lack of modelling and simulation standardisation, verification, and validation. Here, we strive towards a solution by providing an open-access, characterised, constitutive relation for 3D musculotendon models. Methods: The musculotendon complex is modelled following the state- of-the-art active stress approach and is treated as hyperelastic, transversely isotropic, and nearly incompressible. Furthermore, force-length and -velocity relationships are incorporated, and muscle activation is derived from motor-unit information. The constitutive relation was implemented within the commercial finite-element software package Abaqus as a user-subroutine. A masticatory system model with left and right masseters was used to demonstrate active and passive movement. Results: The constitutive relation was characterised by various experimental data sets and was able to capture a wide variety of passive and active behaviours. Furthermore, the masticatory simulations revealed that joint movement was sensitive to the muscle’s in-fibre passive response. Conclusions: This user-material provides a “plug and play” template for 3D neuro-musculoskeletal finite-element modelling. We hope that this reduces modelling effort, fosters exchange, and contributes to the standardisation of such models. Information about the parameters can be found in the <a href="https://darus.uni-stuttgart.de/file.xhtml?fileId=68619">readme.pdf</a>

Saini, H., & Röhrle, O. (2022). A Biophysically Guided Constitutive Law of the Musculotendon-Complex: Modelling and Numerical Implementation in Abaqus. Computer Methods and Programs in Biomedicine.

10.1016/j.cmpb.2022.107152

Saini, H., & Röhrle, O. (2022). A Biophysically Guided Constitutive Law of the Musculotendon-Complex: Modelling and Numerical Implementation in Abaqus. Computer Methods and Programs in Biomedicine.

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P1_TK-A2-HB.csv

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P2_MK-A1-GD.csv

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User guide

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User material for Abaqus/Explicit (*.for extension for Windows OS and *.f extension for Linux based OS)

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