在高热合下使用两种环氧粘合剂的BFRP接头的故障研究
Ruitao Niu1, Yang Yang2, Yinghao Lin3
1School of Aerospace Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China.
Polymers
|October 14, 2023
概括
基岩纤维增强聚合物 (BFRP) 结合结构在潮湿,热的环境中呈现降解. 分析了粘合性能和故障机制,以评估在极端条件下的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 聚合物科学 聚合物科学
背景情况:
- 基岩纤维增强聚合物 (BFRP) 结合结构为民用应用提供了轻量化,高强度和环保等优势.
- 了解高热降解对于BFRP结合结构在具有挑战性的环境中的长期性能和可靠性至关重要.
研究的目的:
- 综合调查BFRP结合结构的高热降解和故障机制.
- 为了比较两个环氧粘合剂BFRP单接头在极端高热环境中老化后的残留性质.
主要方法:
- 在80°C的纯水中老化240小时,480小时和720小时的BFRP单接头.
- 使用水吸收测试,热重力测量分析 (TGA),里埃变换红外光谱 (FTIR),微分扫描热量测量 (DSC),扫描电子显微镜 (SEM) 和能量散射X射线分析 (EDX) 的表征.
- 评估故障强度,负载位移曲线和故障模式的分析.
主要成果:
- 湿热老化导致分子链的降解,并降低了环氧粘合剂的玻璃过渡温度 (Tg).
- 失败强度和刚度显示出两种粘合剂的不同趋势,与粘合剂Tg和水吸收率相关.
- 故障模式从纤维撕裂过渡到混合故障,受水吸收和水解的影响.
结论:
- 这项研究提供了关于BFRP结合结构的高热降解行为和故障机制的见解.
- 单独的水解度不足以判断关节降解;需要对属性的综合分析.
- 数据支持BFRP结合结构在潮湿和炎热环境中的应用,并考虑适当的粘合剂选择和设计.
相关概念视频
Flexural Stress
257
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to...
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to...
257
Fiber Reinforced Concrete
86
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
86
Mortar Joint Deterioration in Masonry
123
Mortar joint deterioration is a significant concern in masonry structures, with water accumulation in the joints leading to damage from freeze-thaw cycles. The repeated expansion of water during freezing and its melting during thawing develop and propagate cracks in the masonry joints. Eventually, this leads to the spalling of mortar from the joints, loosening masonry units and weakening the structure. The deteriorated mortar joints are also vulnerable to moisture intrusion into the walls.
The...
The...
123
Stresses under Combined Loadings
167
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
167
Residual Stresses in Bending
181
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
181
Accelerated Curing of Concrete
154
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
154


