Abstract
A general theory for computing and identifying the stress field in a residually stressed tissue is presented in this paper. The theory is based on the assumption that a stress free state is obtained by letting each point deform independently of its adjacent points. This local unloading represents an initial strain, and can be described by a tangent map. When experimental data is at hand in a specific situation, the initial strain field may be identified by stating a nonlinear minimization problem where this data is fitted to its corresponding model response. To illustrate the potential of such a method for identifying initial strain fields, the application to an in vivo pressure–radius measurement for a human aorta is presented. The result shows that the initial strain is inconsistent with the strain obtained with the opening-angle-method. This indicates that the opening-angle-method has a too restrictive residual strain parameterization, in this case
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Olsson, T., Klarbring, J.S.A. Modeling initial strain distribution in soft tissues with application to arteries. Biomech Model Mechanobiol 5, 27–38 (2006). https://doi.org/10.1007/s10237-005-0008-8
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DOI: https://doi.org/10.1007/s10237-005-0008-8