本文選題：復合材料 + 半豆莢桿��； 參考：《南京航空航天大學》2015年碩士論文

【摘要】：復合材料豆莢桿在大型空間可展開結(jié)構(gòu)中有著廣泛的應(yīng)用前景,是近期航天領(lǐng)域的一個研究熱點。先進拉擠(Advanced Pultrusion,簡稱ADP)技術(shù)是一種高自動化、低成本的連續(xù)成型方法,非常適合超長復合材料豆莢桿的制備。本文以復合材料半豆莢桿為研究對象,針對現(xiàn)有ADP技術(shù)制備的半豆莢桿制件存在的表面纖維畸變、步進紋以及厚度不足等缺陷展開了相應(yīng)的改進研究,提出了預處理方法,確定了預處理工藝參數(shù),并研究了預處理工藝對制件性能的影響,最后采用預處理技術(shù)完成了半豆莢桿的試制,減輕了上述缺陷、獲得了質(zhì)量優(yōu)良的制件。本文主要工作如下:(1)應(yīng)用樹脂流動模型,分析了各項因素對制件缺陷的影響,并提出了預處理方案,即在預浸料進入熱壓模具之前對其進行預熱處理,使預浸料中的樹脂發(fā)生凝膠,減少樹脂在壓力作用下的流動,進而消除上述缺陷。根據(jù)半豆莢桿制件對厚度的要求,通過計算提出了預處理工藝指標,將所用超薄預浸料樹脂流失質(zhì)量分數(shù)控制在2.3%。(2)對所用樹脂體系進行了DSC測試和粘度測試,結(jié)合預處理工藝對加工效率的要求,初步確定了適合預處理工藝的溫度:100℃、105℃、110℃。在上述溫度條件下,利用烘箱預熱、熱壓裝置熱壓擠膠的方法,模擬了ADP工藝過程中的樹脂流動,以試驗前后預浸料樹脂質(zhì)量流失2.3%為目標,確定了適合ADP工藝的三組預處理參數(shù):100℃下保溫48min、105℃下保溫42min、110℃下保溫23min。(3)采用上述預處理工藝制備了與半豆莢桿鋪層相同的復合材料層合板,對其樹脂含量、厚度、軸向拉伸性能、層間拉伸性能進行了測試。結(jié)果表明,預處理工藝制得的試樣樹脂含量和厚度得到了有效的控制,試樣的軸向拉伸性能和層間拉伸性能都沒有發(fā)生明顯降低,表明預處理工藝滿足豆莢桿的實際使用要求。(4)在實驗室ADP裝備的基礎(chǔ)上,搭建了可連續(xù)成型的預處理裝置,在100℃保溫48min的預處理工藝參數(shù)下對半豆莢桿進行了試制。制備的半豆莢桿制件表面纖維畸變得到消除、步進紋缺陷明顯減輕,制件厚度也達到設(shè)計要求。在半豆莢桿上取樣,分別進行了軸向拉伸試驗、層間拉伸試驗,驗證得到最終半豆莢桿質(zhì)量符合要求。
[Abstract]:Advanced Pultrusion (ADP) technology is a high automation and low cost continuous forming method, which is very suitable for the preparation of super long composite pod rod. This paper is based on composite material. The semi bean pod rod is the research object. According to the defects of the surface fiber distortion, the step pattern and the insufficiency of the thickness of the semi bean pod rod made by the existing ADP technology, the pre treatment method is put forward, the pretreatment process parameters are determined, and the influence of the preprocessing technology on the performance of the parts is studied. Finally, the preprocessing method is used. The main work is as follows: (1) apply the flow model of resin and analyze the influence of various factors on the defects of the parts, and put forward the pre treatment plan, that is to preheat the prepreg before entering the hot pressing die, so as to make the prepreg in the prepreg. The resin takes place to reduce the flow of resin under pressure and eliminate the above defects. According to the requirement of the thickness of the semi bean pod rod, the pretreatment technology index is put forward by calculation. The loss mass fraction of the super thin prepreg resin is controlled in 2.3%. (2) for the DSC test and viscosity test of the resin system used. The pre treatment process required the processing efficiency, initially determined the temperature suitable for the pretreatment process: 100, 105, 110. Under the above temperature conditions, the resin flow in the ADP process was simulated by using the oven preheating and hot pressing device by hot pressing. The resin mass loss of pre prepreg before and after the test was 2.3% as the target. Three groups of pretreatment parameters of ADP process: 48min under 100 C, 42min under 105 C and 23min. (3) for heat preservation at 110 C (3), the same composite laminates with half pod paving layer are prepared by the above pretreatment process. The resin content, thickness, axial tensile properties and interlaminar tensile properties are tested. The results show that the pretreatment process is made. The resin content and thickness obtained were effectively controlled, the axial tensile properties and interlaminar tensile properties of the samples were not significantly reduced, indicating that the pretreatment technology met the actual requirements of the bean pods. (4) on the basis of the ADP equipment in the laboratory, a continuous forming preconditioning device was built, and the preconditioning at 100 degrees centigrade was pretreated. The semi bean pod rod was tested under the processing parameters. The surface fiber distortion of the prepared semi bean pods was eliminated, the step defect was obviously reduced and the thickness of the workpiece reached the design requirement. The axial tensile test and interlayer tensile test were carried out on the semi bean pods.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：V46

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