Mechanical Properties Comparison of Four Models, Failure Theories Study and Estimation of Thermal Expansion Coefficients for Artificial E-glass Polyester Composite


In this paper, the mechanical properties of artificial E-glass reinforcedpolyester composite were evaluated; the elastic properties and the strength of thecomposite were measured experimentally by tensile tests and then compared withthe predicted values by theoretical four micromechanical constitutive models. Thestrength of the composite lamina and laminates were also determinedexperimentally and compared with five widely used theoretical failure theories.The lamination theory was also used to determine the strength of laminates byapplying Hill- Tsai failure criterion. The theoretical models showed that thecomposite stiffness increases with increasing the fibre volume fraction and thevolume fraction which gave the best fit to the experimental results of elasticmodulus (E1) corresponds to volume fraction (Vf) equal 0.37. The stiffness of aunidirectional lamina depends on the fiber orientation relative to the off-axis loaddirection, and it drops sharply as the fiber alignment angle increases. In addition,the prediction of thermal expansion coefficients of composite is carried out in thepresent analysis, whereas the values of the coefficient that estimated to be based onthe mechanical properties of the certain composite theoretically andexperimentally.