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对切割与未切割的三维全五向(3DF5D)编织复合材料进行了纵向拉伸力学性能研究。首先分别对2种编织角下3种不同情况(未切割、沿厚度方向切边和沿宽度方向切边)的试件进行了力学性能实验,实验结果表明,沿着厚度方向切边使材料的刚度和强度分别下降了约10%和25%;沿着宽度方向切边使材料刚度和强度分别下降了约3%和18%;进一步通过有限元数值模拟对上述实验过程进行了仿真计算,得到了单胞的损伤演化过程、破坏机理以及应力-应变曲线。最后对实验结果和计算结果进行了对比,结果显示二者吻合良好。研究结果表明,三维全五向编织复合材料的编织角越大,拉伸刚度和强度会越小;试件尺寸越大,厚度方向和宽度方向切边的影响越小,并趋于定值。
Longitudinal tensile mechanical properties of 3DF5D braided composites with and without cutting were studied. Firstly, the mechanical properties of the specimens in three different conditions (uncut, trimming in the thickness direction and trimming in the width direction) under two kinds of braiding angles were carried out respectively. The experimental results show that the trimming of the material Stiffness and strength decreased by about 10% and 25% respectively; while the cutting along the width direction decreased the material stiffness and strength by about 3% and 18% respectively; and the above experimental process was further simulated by finite element numerical simulation to obtain Damage evolution, destruction mechanism and stress-strain curves of the cells were studied. Finally, the experimental results and calculated results were compared, the results show that the two agree well. The results show that the larger the braid angle is, the lower the tensile stiffness and strength will be. The larger the specimen size, the smaller the influence of the trimming in the thickness direction and the width direction will tend to be.