TIME AND TEMPERATURE DEPENDENCE OF THEVISCOELASTIC PROPERTIES OF PEEK/IM7

摘要

Understanding viscoelastic properties of composite materials is essential for the designand analysis of many advanced structures. However, experimental viscoelastic characterization ofanisotropic materials can be complicated because of the number of independent parameters to beevaluated. Recently, an approach leading to the 3-D viscoelastic characterization of transverselyisotropic materials using a reduced number of measured parameters has been developed. The modelreduces the number of independent parameters to describe the viscoelastic behavior of transverselyisotropic materials, which greatly simplifies the experimental procedures. Based on this recentlydeveloped model, the present work evaluates time and temperature effects on the viscoelasticproperties of a fiber reinforced lamina. The experimental investigation is conducted on sub-scalespecimens loaded in flexure, using Dynamic Mechanical Analysis (DMA) equipment. Ultimately, theapproach presented in this work will allow the construction of master curves for the independentviscoelastic parameters that characterize a transversely isotropic material.Therefore,theexperimental technique presented in this work provides a means for the study of viscoelasticproperties of fiber reinforced composites, and constitutes a valuable contribution to the understandingof time and temperature dependence of these mechanical properties.