An elasto-viscoplastic model to describe the ratcheting behavior of articular cartilage.

Abstract:

:In the present work, a constitutive model for articular cartilage is proposed in finite elasto-viscoplasticity. For simplification, articular cartilage is supposed to be a typical composite composed of a soft basis and a fiber assembly. The stress tensor and free energy function are hence accordingly divided into two components. The high nonlinear stress-strain response is assumed to be mainly related to the fiber assembly and described by an exponential-type hypoelastic relation. Ratcheting is considered according to the viscoplasticity, the evolution rule of which is deduced from the dissipative inequality by the co-directionality hypotheses. Then, the capability of the proposed model is validated by comparing its predictions with related experimental observations. Results show that the ratcheting behavior and stress-strain hysteresis loops are reasonably captured by the proposed model.

authors

Zhu Y

doi

10.1007/s10237-018-1062-3

subject

Has Abstract

pub_date

2018-12-01 00:00:00

pages

1875-1883

issue

6

eissn

1617-7959

issn

1617-7940

pii

10.1007/s10237-018-1062-3

journal_volume

17

pub_type

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