关键词: CFRP, 低温, 螺栓连接, 拉-拉疲劳

Abstract: The tensile fatigue of bolted connections at low temperature is studied, mainly aiming to solve the tension-tension fatigue problems of Carbon Fiber Reinforced Plastics (CFRP) and 2024Al. Firstly the tensile experiments under different environment were performed to get the maximum static load. Then the damage process of the heterogeneous material laminated plate connected joints under the different temperature was explored through the static load damage curve. Then the delamination and tear degree of the composite laminated plates were compared by the observation of different temperature tensile failure phenomenon. Moreover, based on the above analysis, the influence of the low temperature environment on the bolt connection fatigue of heterogeneous material was explored. Then the different temperature grouping of laminated plates joint in their respective 85%, 80% and 75% respectively were chosen to undergo room temperature and low temperature fatigue experiments under the maximum static load condition. The experimental results were used to fit S-N curve of normal temperature and low temperature. The results demonstrated that the tensile failure strength of the lower bonding plate joints in low temperature environment was stronger than that in normal temperature environment under the same experimental conditions. Fatigue curve analysis showed that the laminated plates under low temperature environment offered stronger fatigue loading ability.

Key words: CFRP, low temperature, bolted connections, tension-tension fatigue