Hygrothermal Aging Mechanisms and Mechanical Behaviors of High-strength Glass Fiber Reinforced Polymer Composites
Compare to the carbon fiber reinforced polymer composites,high-strength glass fibers and their polymer composites are more sensitive to hygrothermal environments.The hygrothermal environment is easily to cause the significant decreases in the mechanical properties of high-strength glass fibers and their polymer composites.In this paper,water immersion tests and property tests were conducted on the high-strength glass fibers with two types of impregnating agents,and the performance data of the high-strength glass fibers before and after hygrothermal was obtained.The absorption and mechanical properties of the polymer composites reinforced by high-strength glass fibers with two types of impregnating agents were studied,and typical hygrothermal-time curves and mechanical data were obtained.Combined with macroscopic and microscopic fracture diagrams,the hygrothermal aging mechanism and damage failure mechanism were studied.The water immersion test results of high-strength glass fibers show that the fiber surface wetting agent dissolves during the process of hygrothermal aging,which causes the fibers to be exposed,and then destroys the structures of the fibers,resulting in the decrease of mechanical properties.The tensile stress-strain curves of high-strength glass fiber composites show typical nonlinear characteristics in the room conditions,and are basically linear in hot and hygrothermal conditions.In the process of damage evolutions,the open-hole tensile load-displacement curves at the room temperature have a special characteristic of"up and down oscillation".The macro and micro fractures show that the tensile failure mode is the main failure mode at the room temperature,while the shear failure mode of fibers and matrix is the main failure mode at the hot and humid environment.
万方数据
维普
