本文選題：芳綸纖維 + 層合板　； 參考：《太原理工大學》2015年碩士論文

【摘要】：纖維增強復合材料層合板和纖維金屬層合板（FMLs）因其具有比強度高、比模量高、可設計性強、制備工藝簡單以及良好的抗疲勞性等優(yōu)越的力學性能被廣泛用于航空航天、汽車艦船、交通運輸和現代保護設備等領域。 本文采用沖擊加載的方式，分別從實驗和數值模擬兩個方面對芳綸纖維/環(huán)氧樹脂（Kevlar/Epoxy）復合材料層合板和芳綸纖維-鋁合金層合板（ARALL）的動態(tài)響應進行了系統(tǒng)的研究�；诰幙桲evlar/Epoxy復合材料層合板的平頭彈沖擊實驗，分析了結構在不同沖量下的變形失效模式及抗沖擊性能。實驗表明復合板的變形失效模式主要表現為：1.彈性變形；2.復合板表面嵌入失效及整體塑性大變形；3.背面纖維的拉伸斷裂及分層失效�；趯嶒炑芯�，應用LS-DYNA971有限元程序對不同鋪層數的復合板在沖擊載荷作用下的動態(tài)響應過程進行了數值模擬，子彈作用區(qū)域邊緣處首先發(fā)生近似圓形的嵌入失效，而在板背面呈近似正方形的破壞區(qū)域，模擬結果與實驗吻合較好。計算中重點分析了纖維板鋪層數對結構動力響應的影響，，在一定沖量范圍內，通過對復合板層數的優(yōu)化，能夠有效地減小后面板撓度，提高結構的能量吸收效率，增強結構的抗沖擊性能。 通過ARALL的球頭彈沖擊加載實驗，分析了不同沖量下ARALL的變形失效模式。實驗表明：1.試件的變形區(qū)域劃分為未變形區(qū)域、整體大變形區(qū)域及局部變形/失效區(qū)域；2.背面鋁層出現了“對角線撕裂”和“十字撕裂”兩種撕裂模式；3.相比于沖擊面復合材料層，背面復合材料層遭受了更嚴重的分層損傷和基質破裂�；趯嶒灲Y果，應用多尺度混合建模的方法，通過HYPERMESH和LS-DYNA971建立了ARALL的有限元模型并進行了數值模擬研究，該模型可以清晰的反映出纖維層和結構整體的變形失效模式：基體的失效、纖維拉伸斷裂、層間相對滑移、分層及整體大變形。該方法采用整體建模與纖維尺度建模相結合的方式，在保持較好的計算精度的同時可以有效減少網格數，為大尺寸纖維復合結構的數值模擬計算提供了一種新的建模方法。
[Abstract]:Fiber reinforced composite laminates (FMLs) and fiber metal laminates (FMLs) are widely used in aeronautics and astronautics because of their high specific strength, high specific modulus, high designability, simple preparation process and good fatigue resistance. Car and ship, transportation and modern protection equipment and other areas. In this paper, the dynamic responses of aramid fiber / epoxy resin Kevin / Epoxycomposite laminates and aramid fiber / aluminum alloy laminated laminates are studied by means of impact loading and numerical simulation. Based on the flat-end impact test of braided Kevlar/Epoxy composite laminates, the deformation failure modes and impact resistance of structures under different impulses were analyzed. The experimental results show that the main deformation failure mode of composite plate is 1: 1. Elastic deformation. Surface embed failure and large plastic deformation of composite plate. Tensile fracture and delamination failure of the back surface fiber. Based on the experimental study, the dynamic response process of composite plates with different layers under impact load was simulated by using LS-DYNA971 finite element program. At first, an approximate circular embedding failure occurred at the edge of the bullet action area. The simulation results are in good agreement with the experimental results. In the calculation, the influence of the number of fiberboard layers on the dynamic response of the structure is analyzed. In a certain impulse range, the deflection of the rear panel can be effectively reduced and the energy absorption efficiency of the structure can be improved by optimizing the number of layers of the composite board. Enhance the impact resistance of the structure. The deformation failure modes of ARALL under different impulses are analyzed by means of the impact loading test of the spherical projectile of ARALL. The experiment shows that 1: 1. The deformation area of the specimen is divided into the undeformed region, the whole large deformation area and the local deformation / failure area. "diagonal tear" and "cross tear" appear on the back of the aluminum layer. Compared with the impact surface composite layer, the back composite layer suffered more serious delamination damage and matrix rupture. Based on the experimental results, the finite element model of ARALL is established by means of HYPERMESH and LS-DYNA971, and the numerical simulation is carried out by using the method of multi-scale hybrid modeling. The model can clearly reflect the deformation failure modes of fiber layer and structure: the failure of matrix, the tensile fracture of fiber, the relative slippage between layers, the delamination and the whole deformation. This method combines global modeling with fiber-scale modeling and can effectively reduce the number of meshes while maintaining good computational accuracy. It provides a new modeling method for the numerical simulation of large-sized fiber composite structures.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB332

【參考文獻】

相關期刊論文 前1條

1 顧冰芳;龔烈航;徐國躍;;Kevlar纖維疊層織物防彈機理和性能研究[J];南京理工大學學報(自然科學版);2007年05期

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