Study On Cryogenic Mechanical Performance Of Nano-Al₂O₃/glass Fiber Reinforced Composites

In this paper, nano-particles/ unidirectional glass fiber reinforced composite was manufactured by vacuum-assisted resin transfer molding technology(VARTM). Materials were treated with low temperature (-60?) and high and low temperature cycle(-40??50?)for different periods. Then, mechanical properties test was carried out, and the fracture morphology was characterized by scanning electron microscopy (SEM). This paper mainly studied the effect of different temperature treatment condition as well as the nano-particles size and content on mechanical properties of composite materials, and the related mechanism also been given. The main work was focused on the following.1. Preparation of the nano-particles/ unidirectional glass fiber reinforced composites and materials parameters like fiber volume content and porosity of composites were analyzed.2. At ambient temperature, the effect of different size and content of nano-particles on tensile and flexural properties of fiber reinforced composites was investigated. The effect mechanism of nanoparticles on tensile and flexural properties at room temperature was further discussed though the SEM technology.3. The different nanoparticles/glass fiber reinforced composites were treated at low temperature (-60 ?) for a certain time, then tensile and flexural performance test to composites were conducted, and the cryogenic mechanical performance was studied. The effect of cryogenic treatment on material mechanical properties and the difference that nanoparticles effect materials between low temperature and room temperature were analyzed by comparing with ambient performance of corresponding materials. Crack propagation characteristics at low temperature were obtained by the analyzing of the fracture surfaces.And the effect mechanism was expatiated further.4. The different nanoparticles/glass fiber reinforced composites were treated at high and low temperature cycle(-40??50?), then tensile and flexural properties of composites were tested and compared with that of room temperature. The effect of high and low temperature cycle on materials behavior and the influence of nanoparticles size and content on composites'properties treated by the different high and low temperature period was studied. Composites failure mechanism and toughning mechanism of particles under the condition of high and low temperature cycle were investigated.