强制风冷对玻璃纤维/乙烯树脂复合材料高周疲劳性能的影响

To study the effects of forced air cooling on the fatigue performance of glass fiber-vinyl resin composites fabricated through unidirectional pultrusion, a quasi-static tensile test was carried out to obtain the ultimate load of failure and analyze its failure modes. On this basis, a high-frequency fatigue testing device with forced air cooling and an infrared camera to monitor the temperature change were used to study the pull-pull fatigue behavior of the composite with or without forced air cooling, and the effects of the forced air cooling on the fatigue life of the specimen were compared and analyzed. The test results show that, under a stress level within 155~240 MPa, the surface temperature of the specimen without forced air cooling measures rises rapidly, leading to the failure of the specimen, while under a stress level of 155 MPa, the temperature rises slowly first and then stabilizes. After forced air cooling, the surface temperature of the specimens will decrease, and the fatigue life will increase significantly, and the stress level will stay below 140MPa. The fatigue life of the specimens is not significantly influenced by forced air cooling measures. Furthermore, the fatigue fracture of the sample is mainly based on the matrix cracking. The proposed experimental method provides reference and guidance for fatigue experimental design of fiber reinforced composites.