界面对双向纤维增强复合材料力学性能的影响
发布时间：2019-03-06 17:09
【摘要】：基于均匀化理论与有限元方法,针对双向连续纤维增强复合材料(CBFRC),建立了微观代表体积单元(RVE)模型,并预测了界面对CBFRC宏观等效力学性能的影响。在建立的RVE模型中,采用表面内聚力本构关系描述纤维/基体之间的界面。研究结果表明:不同界面刚度下,CBFRC中的基体发生不同形式的初始损伤。与界面断裂能相比,界面刚度和界面强度对CBFRC面外抗拉强度的影响较大,而对CBFRC面内抗拉强度的影响较小,且界面的存在会降低CBFRC整体的抗拉强度。随着纤维体积分数的增加,CBFRC面内的抗拉强度也随之急剧增加,但CBFRC的面外抗拉强度反而有减小的趋势。本文中所提出的方法能够简单有效地对实际复杂的三维纤维增强复合材料进行优化设计。
[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.
【作者单位】： 南昌航空大学航空制造与工程学院;
【基金】：国家自然科学基金(11372126)
【分类号】：TB332
，
本文编号：2435728
[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.
【作者单位】： 南昌航空大学航空制造与工程学院;
【基金】：国家自然科学基金(11372126)
【分类号】：TB332
，
本文编号：2435728
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