Theoretical model for the temperature dependent longitudinal tensile strength of unidirectional fiber reinforced polymer composites

Abstract

In this paper, a theoretical model for predicting the longitudinal tensile strength of unidirectional fiber reinforced polymer (FRP) composites at different temperatures is established. This model considers the combined effects of temperature, matrix strength, fiber size, fiber volume fraction, and the fiber strength scatter on the tensile strength of unidirectional FRP composites. The model is verified by comparison with available experimental data of carbon fiber and glass fiber reinforced polymer composites at different temperatures. The agreement between the theoretical model and experimental results is found to be satisfactory, which indicates the applicability and reasonability of the model. Particularly, the model has advantages compared with Curtin's model, Gao-Reifsnider's (G-R's) model and Subramanian-Reifsnider's (S-R's) model from the aspects of accuracy and convenience. Furthermore, the influencing factor analysis for unidirectional FRP composites regarding their temperature dependent tensile strength was systematically conducted, which provide better understanding on the strength control mechanism and material design.