纤维取向与打团效应对玄武岩纤维增强复合材料拉伸性能的影响

发布时间：2018-08-19 16:06

【摘要】：基于Tsai理论,针对纤维体积掺加率为0.6%、0.9%、1.2%、1.5%,纤维取向角为0°、15°、30°、45°的玄武岩纤维-环氧树脂复合材料(BFRP)进行了轴向拉伸强度实验研究,并引入纤维均分系数和打团纤维含量表征玄武岩纤维在环氧树脂中的打团效应,建立打团纤维的细观力学模型与几何模型,对BFRP的拉伸强度进行了数值计算对比分析。结果表明,纤维体积掺加率一定时,BFRP的拉伸强度随纤维取向角的增大而减小,纤维取向角一定时,BFRP的拉伸强度随纤维体积掺加率的增大而增大;纤维均分系数随纤维体积掺加率的增大而减小,打团纤维含量随纤维体积掺加率的增大而增大;纤维打团效应的存在,导致了BFRP的纤维临界体积掺加率较纤维均分时有所增大,降低了玄武岩纤维对环氧树脂基材拉伸强度的增强幅度;考虑纤维打团效应的BFRP拉伸强度计算值与实验结果接近。
[Abstract]:Based on Tsai's theory, the axial tensile strength of basalt Fiber-epoxy resin composites (BFRP) with fiber volume fraction of 0.6%, 0.9%, 1.2%, 1.5%, fiber orientation angles of 0, 15, 30, and 45 degrees was studied. The pelleting effect of basalt fiber in epoxy resin was characterized by introducing fiber evenness coefficient and pellet content. The results show that the tensile strength of BFRP decreases with the increase of fiber orientation angle when the fiber volume fraction is constant, and the tensile strength of BFRP increases with the increase of fiber volume fraction when the fiber orientation angle is constant. The dimension average fraction coefficient decreases with the increase of fiber volume fraction and the content of pellet fiber increases with the increase of fiber volume fraction. The calculated tensile strength of BFRP considering fiber group effect is close to the experimental result.
【作者单位】：西安理工大学土木建筑工程学院;
【基金】：国家自然科学基金项目(11302167)
【分类号】：TB332

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