本文選題：自動鋪絲 + 參數(shù)優(yōu)化�。� 參考：《南京航空航天大學》2016年碩士論文

【摘要】：自動鋪絲技術集成了CAD/CAM、數(shù)控、加熱等技術,兼?zhèn)淞俗詣愉亷Ъ夹g與纖維纏繞技術的優(yōu)點,是當今先進復合材料十分重要的成形技術之一。預浸絲束的鋪放工藝性直接影響了鋪放質(zhì)量,是自動鋪放過程順利進行的保證,亦決定了產(chǎn)品性能的優(yōu)劣。本文以大型復合材料構件自動鋪放為背景、以國產(chǎn)碳纖維預浸料為研究對象,用南京航空航天大學自主研發(fā)的自動鋪絲機,分別研究了相關工藝參數(shù)在平面順直鋪放過程、以及平面曲線鋪放過程對鋪放質(zhì)量產(chǎn)生的影響,并進行了工藝參數(shù)優(yōu)化。在此基礎上,研究了典型工藝缺陷的存在對鋪放試件相關力學性能的影響。(1)在考慮預浸絲與模具表面及其層間貼合情況下,提出了一種較為完善的鋪放質(zhì)量評價方法。利用該評價方法分別研究了鋪放溫度T、鋪放壓力F、鋪放速率v對于鋪放質(zhì)量的影響,發(fā)現(xiàn)隨著鋪放溫度、壓力的增加鋪放質(zhì)量先提升后降低;隨著鋪放速率的增加鋪放質(zhì)量呈下降趨勢。(2)分析了平面曲線鋪放過程中預浸絲束易產(chǎn)生的缺陷類型及其產(chǎn)生機制;并且通過有效貼合長度比來表征絲束曲線鋪放的效果,并利用絲束臨界回轉半徑表征絲束平面?zhèn)葟澴冃文芰Α囟ㄤ伔艞l件下,有效貼合長度比越大,絲束臨界回轉半徑越小,絲束平面?zhèn)葟澞芰υ綇?鋪放效果越好。利用上述方法分別研究了各工藝參數(shù)對于鋪放質(zhì)量及絲束平面?zhèn)葟澴冃文芰Φ挠绊?發(fā)現(xiàn)絲束臨界回轉半徑隨鋪放溫度的增加而減小;絲束臨界回轉半徑隨著鋪放壓力的增加先減小到某臨界值后再增大;絲束臨界回轉半徑隨著鋪放速率的增加而增大。(3)以單向層合板為研究對象,研究了鋪絲工藝中增減紗帶來的缺陷(橫向間隙、搭接)對復合材料構件性能的影響。含兩種典型缺陷(含缺陷層兩兩絲束之間橫向間隙、搭接量均為1mm)的固化后復合材料力學性能:(1)當橫向間隙增大至1mm時,試件橫向拉伸強度下降12.62%、彎曲強度下降17.82%、而對縱向拉伸強度、試件厚度及彈性模量影響不大。(2)當橫向搭接增大至1mm時,試件橫向拉伸強度強度上升23.65%、彎曲強度上升3.35%、厚度增加9.06%、而對縱向拉伸強度、彈性模量影響不大。
[Abstract]:Automatic wire laying technology integrates CAD / CAM, numerical control, heating and so on. It has the advantages of automatic tape laying and filament winding. It is one of the most important forming technologies of advanced composite materials. The laying process of prepreg wire bundles has a direct impact on the laying quality, which is the guarantee of the smooth process of automatic laying, and also determines the quality of the product. In this paper, based on the automatic placement of large composite components and the domestic carbon fiber prepreg as the research object, the process of parallel laying of the related technological parameters in the plane is studied using the automatic filament-laying machine developed by Nanjing University of Aeronautics and Astronautics and Aeronautics and Astronautics, respectively. The influence of plane curve laying process on laying quality is also discussed, and the process parameters are optimized. On this basis, the influence of the typical process defects on the mechanical properties of the laying test piece is studied. (1) A more perfect evaluation method of laying quality is put forward considering the bonding of prepreg wire and die surface and its interlayer. The influence of laying temperature T, laying pressure F and laying rate v on laying quality was studied by using the evaluation method. It was found that with the increase of laying temperature, the laying quality increased first and then decreased. With the increase of laying rate, the laying quality tends to decrease. (2) the defect types and the mechanism of prepreg wire bundles are analyzed in the process of plane curve laying, and the effect of bundle curve placement is characterized by the effective bonding length ratio. The critical rotation radius of the wire bundle is used to characterize the deformation ability of the wire bundle plane lateral bending under certain laying conditions. The larger the effective bonding length ratio is, the smaller the critical rotation radius of the wire bundle is, the stronger the lateral bending ability of the wire bundle is, and the better the laying effect is. The effects of the process parameters on the laying quality and the lateral bending ability of the wire bundles are studied by using the above method. It is found that the critical radius of rotation decreases with the increase of laying temperature. The critical radius of rotation decreases to a certain critical value and then increases with the increase of laying pressure, and the critical radius of rotation increases with the increase of laying rate. (3) the unidirectional laminated plate is taken as the research object. The influence of the defects (transverse gap, lap joint) on the properties of composite components caused by the addition and decrease of yarn in the process of wire laying was studied. The mechanical properties of the composite with two typical defects (transverse gap between two bundles with defect layer and overlap ratio of 1mm) are as follows: (1) when the transverse gap increases to 1mm, The transverse tensile strength and flexural strength of the specimen decreased 12.62 and 17.82 respectively, while the thickness and elastic modulus of the specimen had little effect on the longitudinal tensile strength. (2) when the transverse lap increased to 1mm, The transverse tensile strength of the specimen increased 23.65, the bending strength increased 3.35, the thickness increased 9.06, but the longitudinal tensile strength and elastic modulus were not affected.
【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】：2016
【分類號】：TB33

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