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三维编织复合材料拉抻性能研究 被引量:5

Research on Tensile Properties of 3-D Braided Composite Materials
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摘要 三维编织复合材料作为一种高级的复合材料,抗分层、耐冲击能力强。本文用真空辅助RTM(树脂传递模塑)工艺合成了四步法3×2编织的复合材料试件,通过实验测定了三维编织复合材料未切割、受切割和钻孔试件的拉伸性能,对比了受切割和未切割纤维对于试件侧边拉伸应变的影响,测定了孔边应力集中系数,并且讨论了影响四步法复合材料拉伸性能的因素和断裂失效的原因。结果表明,随着编织角的增大,拉抻模量和拉伸强度减小;受切割和钻孔的试件拉伸性能低于未加工试件的性能;四步法复合材料的孔边应力集中系数比层板材料和金属材料的低;三维编织复合材料的拉伸失效主要是由纤维断裂以及纤维拉拔造成的。 As a kind of advanced composite materials, 3-D braided composites have superior delamination resistance and impact tolerance. In this paper 4-step 3×2 braided composite specimens were formed by means of RTM (Resin Transfer Moulding) technique with vacuum assisted. A measurement was taken by means of experiment on the tensile properties of 3-D braiding uncut, cut and drilled composite specimens. The effect of cut fibres on the tensile strain of specimen edge was compared with that of uncut fibres. The stress concentration coefficient around hole was measured. The factors affecting tensile properties of 4-step composites and the reasons for failure were discussed. The results showed that with the braiding angle increased, the tensile mudulus and strength decreased. The tensile properties of cut and drilled specimens were inferior to that of uncut specimens. The stress concentration coefficient around hole of 4step composite materials was lower than that of laminates and metals. The tensile failure of 3-D braided composites appeared to be a result of fibre breakage with some evidence of fiber pullout.
作者 孙慧玉
出处 《南京航空航天大学学报》 CAS CSCD 1995年第6期721-725,共5页 Journal of Nanjing University of Aeronautics & Astronautics
关键词 复合材料 抗张性能 三维编织 应力集中 断裂 composite materials tensile properties three-dimensional braide stress concentration failure
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