应用纤维束复合材料试验研究层合板界面性能

发布时间：2018-07-10 18:58

本文选题：碳纤维增强环氧树脂复合材料 + 界面　；参考：《华南理工大学》2015年硕士论文

【摘要】：纤维增强复合材料是由增强体纤维材料,如玻璃纤维,碳纤维等,与基体材料经过湿法缠绕,模压或拉挤等成型工艺而形成的复合材料。因其具有高比强度、比刚度等特点,被作为结构工程材料广泛应用于航海、航空航天、汽车、体育器械等重要领域。纤维和基体相互接触部位因为发生物理或化学反应会形成界面,界面是纤维和基体之间的一个过渡区域,其力学性质和基体、纤维都有所不同。纤维和基体之间的界面性质无法直接测量,一般用纤维和基体材料之间的粘结强度来表征界面性质。纤维和基体的粘结强度对纤维增强复合材料的力学性能起着非常重要的作用,粘结强度低,会影响材料的最终力学性能。因界面的表面积非常大,复合材料的微细观结构缺陷,例如小孔、杂质和微裂纹,在界面层位置比较多,这些结构缺陷会导致应力集中,降低界面的载荷传递效率,最终影响纤维增强复合材料的宏观力学性能。本文发展了纤维束复合材料的测试技术,用以模拟常规单向层合板的横向拉伸试验和剪切试验,对T700碳纤维增强E51环氧树脂基复合材料的界面粘结强度进行了试验研究。通过对比纤维束复合材料和单向层合板的试验结果,以及其相应的破坏形态,建立纤维束复合材料测试结果与其模拟的单向层合板的力学试验结果的关系。基于该成果,可以实现用较为简单的纤维束复合材料试验的结果评估或预测相应的单向层合板的宏观界面力学性能。
[Abstract]:Fiber reinforced composites (FRC) are composites formed by fiber reinforced materials, such as fiberglass, carbon fiber, and matrix materials, which are formed by wet winding, moulding or pultrusion. Because of its high specific strength, specific stiffness and other characteristics, it is widely used as structural engineering materials in navigation, aerospace, automobile, sports equipment and other important fields. The interface between fiber and matrix is formed because of physical or chemical reaction. The interface is a transition region between fiber and matrix, and its mechanical properties and matrix are different from each other. The interfacial properties between fiber and matrix can not be measured directly. Generally, the bond strength between fiber and matrix is used to characterize the interfacial properties. The bond strength between fiber and matrix plays an important role in the mechanical properties of fiber reinforced composites. The low bond strength will affect the ultimate mechanical properties of the composites. Because the surface area of the interface is very large, the microstructural defects of the composite, such as pores, impurities and microcracks, are more in the interfacial layer. These structural defects will lead to stress concentration and reduce the load transfer efficiency of the interface. Finally, the macroscopic mechanical properties of fiber reinforced composites are affected. In this paper, the testing technique of fiber bundle composites has been developed to simulate the transverse tensile test and shear test of conventional unidirectional laminates. The interfacial bond strength of T700 carbon fiber reinforced E51 epoxy resin composites has been studied experimentally. By comparing the experimental results of fiber bundle composites and unidirectional laminates and their corresponding failure patterns, the relationship between the test results of fiber bundle composites and the mechanical test results of unidirectional laminated plates simulated by fiber bundle composites was established. Based on this result, it is possible to evaluate or predict the macroscopic interfacial mechanical properties of unidirectional laminates with the results of simple fiber bundle composite test.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

【共引文献】