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Thermo-inelastic Response of Polymeric Solids
Final rept. 13 Sep 2010-12 Mar 2014
TEXAS ENGINEERING EXPERIMENT STATION COLLEGE STATION
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We the study the impact response of a large layered viscoelastic plate by subjecting it to a variety of inputs at one end of plate while the other end is fixed. The nonlinear response of the material is modeled using an implicit two network theory. A finite volume technique is used to solve the momentum equation together with a one-step explicit scheme for the time evaluation and in order to capture the wave propagation phenomena. Polymethylmethacrylate PMMA and Polycarbonate PC are used in this study. Results indicate that the stress on the wall was lowest when using a trilayer PMMAPCPMMA. Such problems have relevance to several applications including blast protection and wave attenuation. The parameters characterizing the model were obtained from the creep compliance data found in the literature. The reflected and the transmitted wave characteristics for the layered materials were studied using the model. The study can be viewed as a significant step in the determination the shock absorbing characteristics of composite layers made of polymeric materials and the model and the method used in this study serve as a tool for selecting better impact resistant composite bodies.
APPROVED FOR PUBLIC RELEASE