Differences in Region-Dependent Compressive Relaxation Behavior of Articular Cartilage and Viscoelastic Constitutive Model
10.16156/j.1004-7220.2025.02.025
- VernacularTitle:关节软骨区域性压缩松弛行为差异及黏弹性本构模型
- Author:
Heng LI
1
;
Shengbo YU
;
Wei ZHANG
Author Information
1. 大连理工大学 工程力学系,工业装备结构分析优化与CAE软件全国重点实验室,辽宁 大连 116024
- Publication Type:Journal Article
- Keywords:
articular cartilage;
stress relaxation;
strain rate;
region-dependent;
constitutive model
- From:
Journal of Medical Biomechanics
2025;40(2):435-440
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the compressive relaxation behavior of cartilage in different regions of the knee joint at different strain rates,and construct the viscoelastic mechanics of cartilage in each region,so as to provide a reference for the prevention of cartilage-related diseases and the development of cartilage repair materials.Methods The knee cartilage of beagle dogs was regionally divided,and the uniaxial unconfined compressive relaxation properties of cartilage in each region were tested by a universal testing machine at different strain rates,and the constitutive models were constructed.Results The cartilage exhibited a notable stress attenuation.Furthermore,the normalized stress reduction increased significantly with increasing strain rate.For cartilage in lateral plateaus of tibia,the normalized stress reduction at strain rate 5×10-4 s-1 was 19%,and increased to 69%at strain rate 5×10-2 s-1.The relaxation equilibrium stress remained relatively constant at all strain rates.The Ogden-Prony viscoelastic model of cartilage in each region was developed with a goodness of fit R2>0.98.Conclusions The knee cartilage demonstrates a significant viscoelastic response in relaxation tests,exhibiting the rate-dependent and region-dependent properties.The Ogden-Pony viscoelastic model can reflect the strain rate-dependent stress relaxation behavior of cartilage.
