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ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

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(a) (b)<br />

Fig.8: Seat pressure distribution beneath one thigh measurement (a) and simulation (b)<br />

Comparing the changes between the two states an increased pressure in the frontal part<br />

of the thigh can be observed for the simulation as well as for the measurement.<br />

Background is the stiffening of the muscle tissue due to muscle contraction. This first<br />

step shows that the selected modeling technique and the material properties are adequate<br />

for implementation of the muscle activity in the CASIMIR model.<br />

6. CONCLUSION<br />

With respect to the simulation results for the isolated muscle and the model of the<br />

complete thigh it was shown that the invented modeling approach enables the possibility<br />

for implementing the muscle activation in the human body model CASIMIR. The next<br />

step will be the qualitative validation procedure with the thigh resp. the complete human<br />

body model. Later this process will have to be enhanced to consider internal values as<br />

e.g. the stress and strain states to fulfill the requirements for clinical relevance to apply<br />

the model for medical investigations.<br />

7. REFERENCES<br />

Gravity<br />

Muscle<br />

contracted<br />

1. Siefert A., et al.: Virtual optimisation of car passenger seats: … International<br />

Journal of Industrial Ergonomics, Vol. 38: pp. 410-424, 2008<br />

2. Siefert A., et al.: Detailed 3D muscle approach for computing dynamic loads on the<br />

lumbar spine for implant design. World Congress on Biomechanics, Singapore 2010<br />

3. Böl, M. et al.: A new approach for validation of skeletal muscle modelling using<br />

MRI data. <strong>CMBBE</strong> (2011), Vol. 47, pp. 591-601<br />

4. ABAQUS (Software), Version 6.10, Abaqus Inc., Providence, RI, USA,<br />

www.abaqus.com<br />

5. Hedenstierna, S., et al.: Evaluation of a combination of continuum and truss finite<br />

elements in a model of passive and active muscle tissue, <strong>CMBBE</strong> (2008), Vol. 11,<br />

pp. 627-639<br />

6. Fung, Y.C.: Biomechanics: mechanical properties of living tissues. Springer<br />

Publishing, <strong>ISBN</strong> 0387979476, New York 1993<br />

7. Van Loocke, et al.: A validated model of passive muscle in compression. Journal of<br />

Biomechanics (2006), Vol. 39, pp. 2999-3009<br />

8. Blemker S.S., et al.: A 3D model of muscle reveals the causes of non-uniform<br />

strains in the biceps brachii. Journal of Biomechanics (2005), Vol. 38, pp. 657-665<br />

9. Siebert, T. et al.: Work partitioning of transversally loaded muscle experimentation<br />

and simulation. <strong>CMBBE</strong>, accepted<br />

10. Siebert, T. et al.: A 3D-geometric model for the deformation of a transversally<br />

loaded muscle. Journal of Theoretical Biology (<strong>2012</strong>), Vol. 298,pp. 116-121

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