复合材料层合板疲劳行为研究

发布时间：2019-06-28 15:23

【摘要】：复合材料在船舶、汽车和航空航天等工业领域得到了广泛的应用,而织物复合材料因其比强度高、材料可设计性好、热膨胀系数小等诸多优势,越来越多的引起科研工作者和工程技术人员的重视。本文以复合材料织物单向板的疲劳试验为基础,探究织物层合板的疲劳性能,发展出一套适用于织物复合材料层合板疲劳累积损伤失效分析的寿命预测方法。首先,将单向纤维增强复合材料层合板疲劳累积损伤寿命预测理论加以推广,应用于织物复合材料层合板,引入强度、刚度退化公式和扩展的Hashin疲劳失效准则,建立织物复合材料层合板疲劳累积损伤寿命预测方法。其次,开展??16?0,90???、??16??45???织物单向层合板准静态拉伸试验,分析其拉伸和剪切强度值;之后进行拉-拉疲劳试验,得到织物单向板的应力-寿命曲线,分析其疲劳破坏形式;利用数学软件拟合得到织物层合板各主方向的强度和刚度退化公式。再次,基于本文推广得到的织物复合材料层合板疲劳累积损伤寿命预测方法,利用FORTRAN语言编写有限元软件ABAQUS的UMAT材料子程序,实现对含孔、不对称铺层织物层合板进行应力分析、疲劳损伤失效模式判断、材料性能逐渐退化、材料性能突然退化以及疲劳寿命预测的分析过程。最后,开展含孔织物层合板的拉-拉疲劳试验,对本文数值模拟所得结果进行验证,验证本文推广得到的复合材料织物层合板疲劳寿命预测方法的适用性与可靠性。
[Abstract]:Composite materials have been widely used in ship, automobile, aerospace and other industrial fields. Fabric composites have attracted more and more attention of scientific researchers and engineers because of their high specific strength, good material design, low thermal expansion coefficient and so on. In this paper, based on the fatigue test of composite fabric unidirectional plate, the fatigue properties of fabric laminated plate are studied, and a set of life prediction method suitable for fatigue cumulative damage failure analysis of fabric composite laminated plate is developed. Firstly, the fatigue cumulative damage life prediction theory of unidirectional fiber reinforced composite laminates is extended and applied to fabric composite laminates. The strength and stiffness degradation formula and the extended Hashin fatigue failure criterion are introduced to establish the fatigue cumulative damage life prediction method of fabric composite laminates. Secondly, carry out 16 / 090, 16 / 45? The quasi-static tensile test of fabric unidirectional laminated plate is carried out, and the tensile and shear strength values are analyzed. Then the tensile-tensile fatigue test is carried out to obtain the stress-life curve of fabric unidirectional plate and its fatigue failure form. The degradation formulas of strength and stiffness in each main direction of fabric laminated plate are obtained by mathematical software fitting. Thirdly, based on the fatigue cumulative damage life prediction method of fabric composite laminates extended in this paper, the UMAT material subprogram of finite element software ABAQUS is compiled by FORTRAN language to realize the analysis process of stress analysis, fatigue damage failure mode judgment, gradual degradation of material properties, sudden degradation of material properties and fatigue life prediction of laminate laminates with holes and asymmetrical laminate. Finally, the tensile fatigue test of porous fabric laminates is carried out, and the numerical simulation results are verified to verify the applicability and reliability of the fatigue life prediction method of composite fabric laminates extended in this paper.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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