本文選題：無內(nèi)襯 + 低溫　； 參考：《大連理工大學(xué)》2015年碩士論文

【摘要】：低溫推進劑貯箱是航天運載器的核心組件,也是航天運載器發(fā)動機能量的來源。為了降低發(fā)射成本,提高運載能力,航天運載器正在朝大型、輕質(zhì)化的方向發(fā)展,使用無內(nèi)襯復(fù)合材料貯箱具有深遠的戰(zhàn)略意義。然而,由于無內(nèi)襯復(fù)合材料貯箱工作環(huán)境惡劣,極易因溫度過低導(dǎo)致復(fù)合材料纏繞層發(fā)生基體開裂,進而由液體燃料泄漏引發(fā)貯箱結(jié)構(gòu)盛裝性的功能失效,因此對結(jié)構(gòu)的安全性要求極高,但目前針對無內(nèi)襯復(fù)合材料貯箱使用特點的低溫失效分析還鮮有報道。首先,本文基于復(fù)合材料單胞分析模型,選取不同針對基體進行強度校核的失效準則,分別對比了宏觀準則與微觀準則、微觀準則之間對低溫下復(fù)合材料基體開裂失效的預(yù)測結(jié)果,從中選出了在低溫失效分析中最為適用的失效準則；并討論了考慮材料熱力學(xué)性能隨溫度變化和不同鋪層形式對低溫下復(fù)合材料基體開裂的影響。隨后,提出了基于單胞分析模型的復(fù)合材料漸進損傷分析方法,該方法實現(xiàn)了復(fù)合材料跨尺度結(jié)構(gòu)響應(yīng)與漸進損傷的一體化分析；并通過層合板算例表明了該方法進行低溫失效分析時的必要性和優(yōu)越性。最后,對一無內(nèi)襯復(fù)合材料貯箱模型進行了漸進損傷分析,對比不同載荷下采用傳統(tǒng)漸進損傷分析方法和基于單胞分析模型的漸進損傷分析方法時無內(nèi)襯貯箱結(jié)構(gòu)的損傷演化狀態(tài)和極限承載性能,并討論了考慮材料熱力學(xué)性能隨溫度變化對無內(nèi)襯復(fù)合材料貯箱極限承載性能的影響。
[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.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB332

【參考文獻】

相關(guān)期刊論文 前1條

1 李星;關(guān)志東;劉璐;黎增山;;復(fù)合材料跨尺度失效準則及其損傷演化[J];復(fù)合材料學(xué)報;2013年02期

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本文編號：2035271