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| 1 | Bolt insertion damage and mechanical behaviors investigation of CFRP/CFRP interference fit bolted joints显示文摘Interference fit has advantages in improving fatigue behaviors of composite bolted joints,however, interference fit bolt insertion tends to cause damages in laminates weakening joint mechanical properties. Therefore, an experimental study was conducted to investigate bolt insertion damages of Carbon Fiber Reinforced Polymer(CFRP)/CFRP interference fit bolted joints.Mechanical behaviors of joints were also evaluated experimentally under both quasi-static loads and cyclic loads. Scanning Electron Microscope(SEM) and high-resolution X-ray micro-CT scan were used to examine micro damages in laminates. Damage and failure behaviors of joints were characterized. The results demonstrated that the hole entrance in upper laminate and the laminate boundary near the hole wall were the most critical regions for damages during bolt insertions. However, the influence of those damages on quasi-static failure loads and fatigue failure modes of joints was minimal. Delamination and matrix cracking occurred first in laminates following fiber and matrix fracture in quasi-static tensile tests. Interference fit could improve the fatigue resistance of the laminate hole, however, the bolt seemed to suffer a more critical local fatigue loading condition.This paper can contribute to composite structure designs, especially in understanding damage and failure behaviors of composite bolted joints. | Yangjie ZUO Ting YUE Ruisong JIANG Zengqiang CAO Liu YANG | 2022 | Chinese Journal of Aeronautics2022，35，9： | 3 |
| 2 | 碳纤维增强树脂基复合材料与金属材料的胶接及混合连接技术研究进展显示文摘碳纤维增强树脂基复合材料(CFRP)与金属材料的先进连接技术(胶接、胶铆与胶螺连接工艺)广泛应用于国防工业、航空航天等重要领域。与传统的铆接、焊接等连接方式不同,胶接与胶铆、胶螺混合连接可克服传统接头应力集中、抗疲劳性能差等问题。从纯胶接的粘接机理、工艺与环境影响因素等方面梳理了CFRP与金属材料胶接接头的基本特征,并结合目前最新的国内外研究进展进一步对胶铆、胶螺混合连接的工艺流程、损伤失效模式、载荷传递路径与工艺影响规律等进行了分析与总结,为CFRP与金属材料的连接应用提供参考。 | 张龙 马冀君 李锋伟 高琪 王以宁 刘盈斌 杨森 王志强 杨亚峰 于方丽 | 2022 | 西安航空学院学报2022，40，5： | 1 |
| 3 | Experimental and numerical investigation of a composite structure with frame and skin显示文摘A composite structure with frame and skin based on cabin structure in a large space telescope is studied in this paper.The frame is composed of longitudinal and transverse beams with hybrid bonded/bolted joints,and the skin is connected to the frame by bolts.Tensile tests are conducted on the structure by a set of test stand.It is observed that residual deformation occurs in the first test of the structure,which is attributed to the relative sliding between the skin and frame because of bolt-hole clearances.The high tightening torque and the increased number of the skin-frame bolts contribute to the high stiffness of the structure.A finite element model(FEM)of this composite structure is established,and the simulation model is verified by the experimental results.The FEM is contrastively analyzed with different frame joints,and it is found that adhesive joining in the hybrid bonded/bolted joints enhances the stiffness of the structure significantly.Given that adhesive plays a leading role in the stiffness of the hybrid joints,Tie contact in FEM is proposed to simulate bonded or hybrid joints when studying the stiffness performance of undamaged structure. | 李传政 XU Shuyan DONG Jihong LIU Bo ZHANG Yaoyu ZHENG Fusheng | 2023 | High Technology Letters2023，29，1： | 0 |
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