热力耦合载荷下无内衬复合材料贮箱力学行为分析

发布时间：2018-06-18 11:06

本文选题：无内衬 + 低温　；参考：《大连理工大学》2015年硕士论文

【摘要】：低温推进剂贮箱是航天运载器的核心组件,也是航天运载器发动机能量的来源。为了降低发射成本,提高运载能力,航天运载器正在朝大型、轻质化的方向发展,使用无内衬复合材料贮箱具有深远的战略意义。然而,由于无内衬复合材料贮箱工作环境恶劣,极易因温度过低导致复合材料缠绕层发生基体开裂,进而由液体燃料泄漏引发贮箱结构盛装性的功能失效,因此对结构的安全性要求极高,但目前针对无内衬复合材料贮箱使用特点的低温失效分析还鲜有报道。首先,本文基于复合材料单胞分析模型,选取不同针对基体进行强度校核的失效准则,分别对比了宏观准则与微观准则、微观准则之间对低温下复合材料基体开裂失效的预测结果,从中选出了在低温失效分析中最为适用的失效准则；并讨论了考虑材料热力学性能随温度变化和不同铺层形式对低温下复合材料基体开裂的影响。随后,提出了基于单胞分析模型的复合材料渐进损伤分析方法,该方法实现了复合材料跨尺度结构响应与渐进损伤的一体化分析；并通过层合板算例表明了该方法进行低温失效分析时的必要性和优越性。最后,对一无内衬复合材料贮箱模型进行了渐进损伤分析,对比不同载荷下采用传统渐进损伤分析方法和基于单胞分析模型的渐进损伤分析方法时无内衬贮箱结构的损伤演化状态和极限承载性能,并讨论了考虑材料热力学性能随温度变化对无内衬复合材料贮箱极限承载性能的影响。
[Abstract]:Cryogenic propellant tank is the core component of space vehicle and the source of engine energy. In order to reduce the launching cost and improve the carrying capacity, the space carrier is developing towards the direction of large scale and light weight. It is of profound strategic significance to use the unlined composite tank. However, due to the poor working environment of the unlined composite tank, it is easy to cause matrix cracking in the winding layer of the composite material due to the low temperature, which leads to the failure of the function of the tank structure filling by liquid fuel leakage. Therefore, the safety requirements of the structure are very high, but there are few reports on the low temperature failure analysis of the unlined composite tank. Firstly, based on the composite cell analysis model, different failure criteria are selected to check the strength of matrix, and the macro criterion and micro criterion are compared respectively. According to the prediction results of matrix cracking failure at low temperature between micro criteria, the most suitable failure criterion for low temperature failure analysis is selected. The effect of the thermodynamic properties of the composites on the matrix cracking at low temperature was also discussed. Then, a method of composite progressive damage analysis based on unit cell analysis model is proposed, which realizes the integrated analysis of cross-scale structural response and progressive damage of composite materials. An example of laminated plate shows the necessity and superiority of this method in low temperature failure analysis. Finally, the progressive damage analysis of an unlined composite tank model is carried out. The damage evolution state and ultimate load-bearing performance of unlined tank structures under different loads are compared between the traditional progressive damage analysis method and the progressive damage analysis method based on the unit cell analysis model. The influence of the thermodynamic properties of the materials on the ultimate bearing capacity of the unlined composite tank was discussed.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

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