本文選題：編織材料 + 層合結(jié)構(gòu)��； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：纖維編織復(fù)合材料是一種新型高溫結(jié)構(gòu)復(fù)合材料和功能材料,不僅具有極好的生物相容性、高比強(qiáng)度、高比剛度、優(yōu)異的抗燒蝕性能及高溫下良好的力學(xué)性能保持度等特點(diǎn),而且具有抗沖擊損傷性能好、抗分層、垂直結(jié)構(gòu)方向強(qiáng)度高、開(kāi)裂不敏感、損傷擴(kuò)展慢的優(yōu)良品質(zhì),因而廣泛應(yīng)用于航空航天領(lǐng)域。針對(duì)大型異質(zhì)層合制件在制造過(guò)程中通常出現(xiàn)一定變形的問(wèn)題,利用有限元仿真技術(shù),探索異質(zhì)層合變形的內(nèi)在原因,通過(guò)結(jié)構(gòu)和工藝等手段實(shí)現(xiàn)異質(zhì)層合材料變形的有效控制,提升大型異質(zhì)層合復(fù)合材料方向的工程技術(shù)水平。本研究在分析所用纖維編織復(fù)合材料微觀組織結(jié)構(gòu)特點(diǎn)的基礎(chǔ)上,從材料研究新視角出發(fā),以纖維增強(qiáng)樹(shù)脂基復(fù)合材料微觀組織結(jié)為研究對(duì)象,在碳纖維大小的尺度上,依據(jù)纖維編織結(jié)構(gòu)和樹(shù)脂基體各自的性質(zhì)、各自的幾何狀態(tài)與取向狀態(tài)來(lái)預(yù)測(cè)及設(shè)計(jì)纖維編織材料的性能與行為,確立了以“數(shù)字化、數(shù)值化、虛擬化、可視化”和“虛擬材料”技術(shù)手段為前提的“材料模型”建模思想,采用三維商用建模軟件CATIA完成了某飛機(jī)蒙皮CKFR-PMCs編織型層合結(jié)構(gòu)幾何模型的建立。在有限元分析階段,首先對(duì)大型整體異質(zhì)層合制件做模流分析,旨在研究制件注射過(guò)程中出現(xiàn)變形情況,再設(shè)計(jì)一種使得注件在注塑過(guò)程中不會(huì)產(chǎn)生翹曲變形的虛擬材料和虛擬工藝,比較兩次注射過(guò)程各物理量隨時(shí)間的演變。模流分析真實(shí)地再現(xiàn)了注射過(guò)程中塑料熔體(流變體)在模具型腔內(nèi)的流動(dòng);準(zhǔn)確地預(yù)測(cè)了制件“注射-壓縮保持-冷卻”工藝流程中各個(gè)階段溫度、壓力等隨時(shí)間的演變。再對(duì)注塑過(guò)程狀態(tài)數(shù)值化,進(jìn)一步將數(shù)值化的狀態(tài)傳輸?shù)接邢拊治鲕浖嗀BAQUS中進(jìn)行工藝分析,再現(xiàn)注射成型整個(gè)過(guò)程中制件表面溫度與應(yīng)力變化,研究工藝參數(shù)對(duì)制件變形的影響,達(dá)到優(yōu)化工藝的目的,得到了異質(zhì)層合復(fù)合材料在溫度載荷作用下的應(yīng)力場(chǎng)、應(yīng)變場(chǎng)以及位移場(chǎng)的分布,實(shí)現(xiàn)了不同有限元分析軟件之間數(shù)據(jù)的交換和狀態(tài)的繼承,建立了“注射壓縮模塑成型仿真平臺(tái)”,在此仿真平臺(tái)上可以完成“模具預(yù)熱-注射成型-壓縮成型-冷卻固化”這一完整的工藝流程中各個(gè)環(huán)節(jié)技術(shù)指標(biāo)參數(shù)與工藝參數(shù)的計(jì)算性優(yōu)化,對(duì)大尺寸、跨尺度的多元多相異質(zhì)復(fù)合材料的成型工藝及變形預(yù)測(cè)具有一定的指導(dǎo)作用。
[Abstract]:Fiber braided composite is a new type of high temperature structure composite and functional material. It not only has excellent biocompatibility, high specific strength, high specific stiffness, excellent ablation resistance and good mechanical performance retention at high temperature, etc. It is widely used in aeronautics and astronautics because of its good impact damage resistance, good delamination resistance, high vertical structural strength, insensitive cracking and slow damage expansion. In view of the problem of deformation in the manufacturing process of large heterogeneous laminates, the internal causes of the deformation of heterogeneous laminates are explored by using finite element simulation technology. By means of structure and technology, the deformation of heterogeneous laminates can be controlled effectively, and the engineering technology level in the direction of large heterogeneous laminated composites can be improved. Based on the analysis of the microstructure characteristics of the fiber braided composites, the microstructure of fiber reinforced resin matrix composites was studied from a new perspective of material research, and on the scale of carbon fiber size, According to the properties of fiber braiding structure and resin matrix and their geometric and orientation states, the properties and behaviors of fiber braiding materials are predicted and designed. Based on the idea of "material model" modeling based on visualization "and" virtual material "technology, the geometric model of a aircraft's CKFR-PMCs braided laminated structure is established by using the three-dimensional commercial modeling software CATIA. In the stage of finite element analysis, first of all, the mold flow analysis is done for the large integral heterogeneous laminated parts, in order to study the deformation in the injection process. A virtual material and a virtual process are designed to prevent the injection from warping in the injection molding process. The physical quantities of the two injection processes are compared with each other over time. The flow of plastic melt (rheological body) in the mold cavity during injection process is reproduced by mold flow analysis, and the evolution of temperature and pressure with time in each stage of the injection, compression, retention and cooling process is accurately predicted. Then the state of the injection molding process is digitized, and the numerical state is further transferred to the finite element analysis software ABAQUS for process analysis, and the change of surface temperature and stress during the whole process of injection molding is reproduced. The effect of process parameters on the deformation of the workpiece is studied, and the distribution of stress field, strain field and displacement field of heterogeneous laminated composites under temperature load is obtained. The data exchange and state inheritance between different finite element analysis software are realized, and the simulation platform of injection compression molding is established. On this simulation platform, the computational optimization of the technical parameters and process parameters of each link in the complete process of "Mould preheating, injection Molding, Compression Molding and cooling curing" can be completed. The forming process and deformation prediction of multi-phase heterogeneous composite materials with cross-scale are instructive.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB332

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