ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


Modeling and experimental investigations of the stress-softening behavior of soft collagenous tissues

T. Schmidt, D. Balzani, A.J. Schriefl, G.A. Holzapfel.

Computational Plasticity XII: Fundamentals and Applications - Proceedings of the 12th International Conference on Computational Plasticity - Fundamentals and Applications, COMPLAS 2013, 133-144, (2013)

This paper deals with the formulation of a micro-mechanically based damage model for soft collagenous tissues. The model is motivated by (i) a sliding filament model proposed in the literature [1] and (ii) by experimental observations from electron microscopy (EM) images of human abdominal aorta specimens, see [2]. Specifically, we derive a continuum damage model that takes into account statistically distributed proteoglycan (PG) bridges. The damage model is embedded into the constitutive framework proposed by Balzani et al. [3] and adjusted to cyclic uniaxial tension tests of a human carotid artery. Furthermore, the resulting damage distribution of the model after a circumferential overstretch of a simplified arterial section is analyzed in a finite element calculation.

Keyword(s): artery; collagenous tissues; continuum damage model; damage distribution; experimental investigations; human abdominal aorta; human carotid artery; uniaxial tensions, biomechanics; collagen; constitutive models; histology; microstructure; plasticity; tens
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