Herger, Edward

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    Characterization of the dynamic onset of fibric damage in type I collagen fascicles
    (2009) Herger, Edward; Sundaram, Paul A.; College of Engineering; Goyal, Vijay K.; Valentín, Ricky; Department of Mechanical Engineering; Singh, Surinder
    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 haracterized 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.