Abstract:
:In this paper, a phenomenological constitutive model is constructed to describe the uniaxial ratchetting (i.e., the cyclic accumulation of inelastic deformation) of soft biological tissues in the framework of finite viscoelastic-plasticity. The model is derived from a polyconvex elastic free energy function and addresses the anisotropy of cyclic deformation of the tissues by means of structural tensors. Ratchetting is considered by the evolution of internal variables, and its time-dependence is described by introducing a pseudo-potential function. Accordingly, all the evolution equations are formulated from the dissipation inequality. In numerical examples, the uniaxial monotonic stress-strain responses and ratchetting of some soft biological tissues, such as porcine skin, coronary artery layers and human knee ligaments and tendons, are predicted by the proposed model in the range of finite deformation. It is seen that the predicted monotonic stress-strain responses and uniaxial ratchetting obtained at various loading rates and in various loading directions are in good agreement with the corresponding experimental results.
journal_name
J Biomechjournal_title
Journal of biomechanicsauthors
Zhu Y,Kang G,Kan Q,Yu Cdoi
10.1016/j.jbiomech.2014.01.004subject
Has Abstractpub_date
2014-03-21 00:00:00pages
996-1003issue
5eissn
0021-9290issn
1873-2380pii
S0021-9290(14)00017-7journal_volume
47pub_type
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