本文選題：二維二軸編織 + 細(xì)觀幾何模型�。� 參考：《東華大學(xué)》2017年碩士論文

【摘要】：為了更加合理有效地運(yùn)用二維二軸編織鋪層復(fù)合材料,需要模擬計(jì)算二維二軸編織鋪層復(fù)合材料的各項(xiàng)具體拉伸性能指標(biāo),為此本文通過分析編織復(fù)合材料的細(xì)觀結(jié)構(gòu)特征,建立一套工程實(shí)用的二維二軸編織鋪層復(fù)合材料單層和多層的細(xì)觀幾何結(jié)構(gòu)模型和等效力學(xué)模型,并提出一套多層編織鋪層復(fù)合材料拉伸模量的數(shù)值計(jì)算方法。最后結(jié)合拉伸斷裂圖像和拉伸實(shí)驗(yàn)數(shù)據(jù)分析復(fù)合材料拉伸斷裂機(jī)理,通過研究二維二軸編織鋪層復(fù)合材料拉伸斷裂性質(zhì)與結(jié)構(gòu)的關(guān)系,總結(jié)出編織復(fù)合材料的拉伸斷裂規(guī)律,進(jìn)而更好地應(yīng)用于實(shí)際生產(chǎn)。本課題研究借鑒前人對復(fù)合材料研究的理論基礎(chǔ)。考慮到纖維屈曲是其模量損失的根本原因,結(jié)合實(shí)際編織復(fù)合材料的紗束橫截面形態(tài)和屈曲起伏結(jié)構(gòu),還有編織工藝和固化工藝影響因素。提出模量損失等效觀點(diǎn),并建立二維二軸2×2編織結(jié)構(gòu)組織單胞模型,纖維紗束起伏屈曲細(xì)觀幾何模型和相對應(yīng)的等效力學(xué)模型。根據(jù)假設(shè)模型給出具體的數(shù)值計(jì)算方法。實(shí)驗(yàn)數(shù)據(jù)表明:由本文提出的屈曲損失模型和等效力學(xué)模型計(jì)算得出的有效模量數(shù)值高于目前文獻(xiàn)計(jì)算精度,并且操作更簡單。對于編織復(fù)合材料面內(nèi)拉伸模量,參照分析前人的相關(guān)處理方法,本課題結(jié)合實(shí)際編織復(fù)合材料面內(nèi)幾何特征,考慮到實(shí)際的生產(chǎn)使用條件,假設(shè)等效編織復(fù)合材料為斜交對稱鋪層復(fù)合材料,應(yīng)用其相關(guān)理論和方法,進(jìn)行合理地面內(nèi)正軸-偏軸轉(zhuǎn)換,最終處理得到編織復(fù)合材料面內(nèi)偏軸方向的有效拉伸模量數(shù)值。關(guān)于多層編織鋪層復(fù)合材料,觀察多層鋪層間的幾何結(jié)構(gòu),根據(jù)實(shí)際結(jié)構(gòu)建立多彈簧并聯(lián)模型,并根據(jù)力學(xué)模型推導(dǎo)出具體拉伸模量的數(shù)值計(jì)算方法,該方法簡單易操作。最終實(shí)驗(yàn)數(shù)據(jù)結(jié)果表明:在拉伸模量數(shù)值變化趨勢上計(jì)算值與實(shí)驗(yàn)值一致。具體數(shù)值結(jié)果上也吻合很好,表明假設(shè)模型的合理性和計(jì)算方法的有效性。對于編織鋪層復(fù)合材料拉伸斷裂機(jī)理,本課題結(jié)合實(shí)際拉伸數(shù)據(jù)和具體拉伸試樣斷裂破壞方式。分析階段性拉伸斷裂過程復(fù)合材料試樣內(nèi)部結(jié)構(gòu)的變化,針對非常規(guī)破壞方式,結(jié)合具體試樣給出了分析,對拉伸斷裂破壞的一般性方式給出了較為客觀的闡述,并分析了相關(guān)斷裂破壞機(jī)理,為后續(xù)二維編織復(fù)合材料的拉伸斷裂研究提供一定的理論依據(jù)。本課題主要采用理論分析法對二維編織復(fù)合材料進(jìn)行拉伸模量研究,更多地考慮二維編織復(fù)合材料的生產(chǎn)條件和使用條件,建立的細(xì)觀幾何模型和等效力學(xué)模型更貼近實(shí)際情況。最終導(dǎo)出的計(jì)算方法建立起了二維編織復(fù)合材料宏觀拉伸模量和細(xì)觀結(jié)構(gòu)與基礎(chǔ)參數(shù)之間的橋梁關(guān)系,對實(shí)際二維編織復(fù)合材料的設(shè)計(jì)生產(chǎn)具有重要意義。
[Abstract]:In order to make more rational and effective use of two dimensional two axis braided laminated composites, it is necessary to simulate and calculate the specific tensile properties of two dimensional two axis braided laminated composites. In this paper, the microstructural characteristics of braided composites are analyzed. A set of engineering practical mesoscopic geometric structure model and equivalent mechanical model of single and multilayer braided composite materials are established, and a set of numerical calculation method for tensile modulus of multilayer braided laminated composites is presented. Finally, the tensile fracture mechanism of the braided composites is analyzed by combining the tensile fracture images and the tensile experimental data. The relationship between the tensile fracture properties and the structure of the braided composites is studied, and the tensile fracture law of the braided composites is summarized. Then it can be better applied in actual production. This research draws lessons from the previous research on the theoretical basis of composite materials. Considering that the fiber buckling is the fundamental reason of the modulus loss, combined with the actual braided composite yarn cross-section shape and buckling undulating structure, as well as the braiding process and curing process influence factors. The equivalent viewpoint of modulus loss is put forward, and the two-dimensional biaxial 2 脳 2 braided structure unit cell model, the mesoscopic geometric model of the undulating buckling of fiber bundles and the corresponding equivalent mechanical model are established. The numerical method is given according to the hypothetical model. The experimental data show that the effective modulus calculated by the buckling loss model and the equivalent mechanical model proposed in this paper is more accurate than that in the literature, and the operation is simpler. For the in-plane tensile modulus of braided composites, referring to the related treatment methods of the predecessors, this subject combines the in-plane geometric characteristics of the actual braided composites and takes into account the actual production and application conditions. Assuming that the equivalent braided composite is a skew symmetric laminated composite, the effective tensile modulus in the plane of braided composite is obtained by using the theory and method of the equivalent braided composite and the rational conversion between the positive axis and the offset axis in the ground. For the multilayer braided laminated composite material, the geometric structure between the layers is observed, and the multi-spring parallel model is established according to the actual structure. According to the mechanical model, the numerical calculation method of the specific tensile modulus is deduced. The method is simple and easy to operate. The final experimental data show that the calculated values are consistent with the experimental values in the trend of tensile modulus numerical variation. The numerical results are in good agreement with each other, which indicates the rationality of the hypothetical model and the validity of the calculation method. For the tensile fracture mechanism of braided laminated composites, this paper combines the actual tensile data and the fracture failure mode of concrete tensile specimens. This paper analyzes the internal structure change of the composite material during the stage tensile fracture process, analyzes the unconventional failure mode, combined with the concrete specimen, and gives a more objective exposition of the general mode of tensile fracture failure. The fracture failure mechanism is analyzed, which provides a theoretical basis for the further study of tensile fracture of two-dimensional braided composites. In this paper, the tensile modulus of two-dimensional braided composites is studied by theoretical analysis, and the production and application conditions of two-dimensional braided composites are considered more. The mesoscopic geometry model and equivalent mechanics model are more close to the actual situation. The calculated method established the bridge relationship between the macroscopical tensile modulus of two-dimensional braided composites and the meso-structure and foundation parameters, which is of great significance to the design and production of two-dimensional braided composites.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB33

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