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为了理解某些胶原类软组织的流变性质,对新鲜、正常人趾伸肌腱进行了流变性质试验。试验包括不同等应变速度的拉伸,不同应变水平的应力松弛、加载—载以及周期加载等。以 Fung Y.C.提出的软组织拟线性粘弹性理论为基础,对试验数据进行了分析,导出了这种组织的应力应变关系的数学表达式并确定了材料常数。应用所得到的本构关系预测了等应变速度下的应力应变关系和加载—卸载关系。结果表明,理论预测与实测数据吻合得相当好。
In order to understand the rheological properties of certain collagen-like soft tissues, rheological properties of fresh, normal extensor digitorum tendon were tested. Tests include tensiles with different strain rates, stress relaxation at different strain levels, load-load and cycle loading. Based on the quasi-linear viscoelastic theory of soft tissue proposed by Fung Y.C., the experimental data was analyzed, and the mathematical expression of the stress-strain relationship of this structure was derived and the material constants were determined. The constitutive relations obtained by the application predicted the stress-strain relationship and load-unload relationship at constant strain rates. The results show that the theoretical prediction agrees well with the measured data.