【摘要】：基于均勻化理論與有限元方法,針對(duì)雙向連續(xù)纖維增強(qiáng)復(fù)合材料(CBFRC),建立了微觀代表體積單元(RVE)模型,并預(yù)測(cè)了界面對(duì)CBFRC宏觀等效力學(xué)性能的影響。在建立的RVE模型中,采用表面內(nèi)聚力本構(gòu)關(guān)系描述纖維/基體之間的界面。研究結(jié)果表明:不同界面剛度下,CBFRC中的基體發(fā)生不同形式的初始損傷。與界面斷裂能相比,界面剛度和界面強(qiáng)度對(duì)CBFRC面外抗拉強(qiáng)度的影響較大,而對(duì)CBFRC面內(nèi)抗拉強(qiáng)度的影響較小,且界面的存在會(huì)降低CBFRC整體的抗拉強(qiáng)度。隨著纖維體積分?jǐn)?shù)的增加,CBFRC面內(nèi)的抗拉強(qiáng)度也隨之急劇增加,但CBFRC的面外抗拉強(qiáng)度反而有減小的趨勢(shì)。本文中所提出的方法能夠簡(jiǎn)單有效地對(duì)實(shí)際復(fù)雜的三維纖維增強(qiáng)復(fù)合材料進(jìn)行優(yōu)化設(shè)計(jì)。
[Abstract]:Based on homogenization theory and finite element method, a micro-representative volume element (RVE) model for bi-directional continuous fiber reinforced composites (CBFRC),) was established, and the effect of interface on the macroscopic equivalent mechanical properties of CBFRC was predicted. In the RVE model, the constitutive relation of surface cohesion force is used to describe the interface between fiber and matrix. The results show that different forms of initial damage occur in the matrix of CBFRC under different interface stiffness. Compared with the interfacial fracture energy, the interface stiffness and interfacial strength have a greater effect on the out-of-plane tensile strength of CBFRC, while the in-plane tensile strength of CBFRC has little effect, and the existence of interface will decrease the tensile strength of CBFRC as a whole. With the increase of fiber volume fraction, the in-plane tensile strength of CBFRC increases sharply, but the out-of-plane tensile strength of CBFRC tends to decrease. The method presented in this paper can be used to optimize the practical complex three-dimensional fiber reinforced composites.
【作者單位】： 南昌航空大學(xué)航空制造與工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(11372126)
【分類號(hào)】：TB332
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本文編號(hào)：2435728