复合材料热压罐成型工装变形分析

发布时间：2019-04-21 06:18

【摘要】：复合材料热压罐成型工艺是目前复合材料制件过程中最主要的成型工艺之一。在实际生产中,复合材料构件成型后的尺寸往往有较大的偏差,其影响因素很多,如工装模具的不同结构导致的通气率不同、模具材料的热膨胀系数与复合材料的热膨胀系数之间的不符以及复合材料成型过程中的内部化学反应引起的变形等。目前,解决复合材料构件成型过程中产生的固化变形导致结构件产生较大的装配误差的问题,主要采用优化热压罐成型过程的相关因素(如:固化温度、固化时间、压强等)和对模具型面反复试验修整的方法,不仅延长了复合材料产品的生产周期,而且增加了复合材料的生产制造成本。本文通过有限元数值模拟的方法,在不同工装结构形式、不同工装材质下,展开了对复合材料构件热压罐成型工装变形的研究,揭示了复合材料构件和工装的温度场分布及变形规律。本文基于复合材料热压罐的成型工艺,重点研究工装结构与模具材质对薄壁复合材料构件及工装的温度场分布和变形影响的问题,阐述了复合材料构件在热压罐内成型工艺原理以及成型过程中的传热规律,利用CATIA三维建模软件和ABAQUS有限元分析软件,根据薄壁复合材料构件和成型工装的结构特点和材料属性,建立三维数值模拟分析模型。预测在热压罐成型过程中薄壁复合材料构件和工装的变形规律,应用ABAQUS有限元分析软件,根据热变形有限元分析原理,研究复合材料部件和模具的温度场分布和变形问题,实现了复合材料热压罐成型工装有限元变形预测分析,对解决薄壁复合材料结构件热压罐成型过程中的固化变形问题有一定的借鉴意义。
[Abstract]:The forming process of composite hot-pressing tank is one of the most important molding processes in the process of composite parts. In practical production, the dimensions of composite components usually have a large deviation after forming, and there are many influencing factors, such as the different structure of tooling and die lead to different ventilation rate, and there are many factors affecting them, such as different structure of tooling and die, which leads to different ventilation rate. The difference between the thermal expansion coefficient of the die material and the thermal expansion coefficient of the composite material and the deformation caused by the internal chemical reaction in the forming process of the composite material. At present, to solve the problem that the curing deformation caused by the forming process of composite components leads to large assembly errors, the main factors of optimizing the forming process of hot-pressing tank (such as curing temperature, curing time, etc.) are adopted to optimize the forming process of hot-pressed tank. Pressure, etc.) and repeated experiments on the mold surface, not only prolong the production cycle of composite materials, but also increase the production cost of composite materials. In this paper, the finite element numerical simulation method is used to study the deformation of the forming tool of the hot pressing tank of the composite material component under the different structure form and the different material of the tool, and the research on the deformation of the hot pressing tank of the composite material component is carried out. The temperature field distribution and deformation law of composite components and tools are revealed. Based on the forming process of composite hot pressing tank, this paper focuses on the influence of tool structure and die material on the temperature field distribution and deformation of thin-walled composite components and tools. The principle of forming process and heat transfer law of composite components in hot-pressing tank are described. The three-dimensional modeling software of CATIA and the finite element analysis software of ABAQUS are used. According to the structural characteristics and material properties of thin-walled composite components and molding tools, a three-dimensional numerical simulation model is established. The deformation law of thin-walled composite components and tooling in the forming process of hot-pressing tank is predicted. The temperature distribution and deformation of composite components and dies are studied by using the finite element analysis software ABAQUS and according to the principle of thermal deformation finite element analysis. The finite element deformation prediction analysis of composite hot-pressing tank is realized, which can be used for reference to solve the problem of solidification deformation in the forming process of thin-walled composite structural parts.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB33

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