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Characterization of the dynamic onset of fibric damage in Type I collagen fascicles.

机译：I型胶原纤维束中纤维损伤的动态发作特征。

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摘要

The mechanical properties of collagen in the form of Type I fascicles obtained from rat tail tendons were determined under dynamic loading conditions. Experimental procedures and apparatus were developed to establish a relationship between parameters of dynamic loading and the ability of collagen to resist damage. The viscoelastic behavior of the fascicles under sinusoidal tensile loading was characterized in terms of loss tangent and dynamic modulus and in terms of models developed specifically to explain the observed results. Dynamic analysis showed an average loss tangent of approximately 0.3 at 0.5 hertz, a value which agrees well with literature. Type I collagen fascicles were able to withstand higher amounts of impulse, defined by area under the force-time curve of the loading function, at higher frequencies for the range tested. Detailed strain analysis revealed two distinct behaviors, a linear hysteric progression of strain which dominates at low loading frequencies and a saturating curve behavior which prevails at high loading frequencies. Computational and mechanistic models have been established for each case. The action of an intermolecular chain mechanism caused by the addition of strain energy affecting the state of cross linking in the material is hypothesized to explain the observed phenomena. Support for this hypothesis is based on the definitive results indicating higher order time-mechanical behavior prevalence with increasing loading frequency.
机译：在动态载荷条件下测定了从大鼠尾部肌腱获得的I型束状胶原蛋白的机械性能。开发了实验程序和设备以建立动态载荷参数与胶原蛋白抵抗损伤的能力之间的关系。根据正切损耗角正切和动态模量，以及专门为解释观察结果而开发的模型，对正弦拉伸载荷下纤维束的粘弹性行为进行了表征。动态分析显示，在0.5赫兹时，平均损耗角正切约为0.3，该值与文献非常吻合。对于测试范围，I型胶原蛋白束能够承受更高的冲量，冲量由加载函数的力-时间曲线下的面积定义。详细的应变分析显示了两种不同的行为，即在低加载频率下占主导地位的线性应变滞回曲线和在高加载频率下占主导的饱和曲线行为。已经为每种情况建立了计算模型和机械模型。假设分子间链机理的作用是由于应变能的增加影响了材料中交联的状态，从而解释了观察到的现象。对这一假设的支持是基于确定的结果，该结果表明随着加载频率的增加，高阶时间-机械行为普遍性。

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  • 作者

    Herger, Edward.;

  • 作者单位

    University of Puerto Rico, Mayaguez (Puerto Rico).;

  • 授予单位 University of Puerto Rico, Mayaguez (Puerto Rico).;
  • 学科 Engineering Mechanical.;Biophysics Medical.;Engineering Materials Science.
  • 学位 M.S.
  • 年度 2009
  • 页码 166 p.
  • 总页数 166
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;工程材料学;生物物理学;
  • 关键词

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