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单丝复合材料段裂试验(SFCFT)中,随着外载荷的增加,纤维出现了随机脆断的现象,并在一定的载荷下纤维的段裂数达到“饱和”状态(即纤维段裂数目不再增加),该试验常用于表征纤维与基体间界面性能。针对该试验,本文中充分考虑了组分材料的真实性能(即基体材料的弹塑性性能),利用弹塑性剪滞理论进行纤维与基体间的应力传递分析,初步获得较真实的纤维轴向应力及界面剪应力分布形式;在此基础上,考虑纤维强度分布的非均匀性,利用蒙特卡罗(Monte Carlo)方法对试验中纤维的随机段裂过程进行了模拟预报,获得载荷与纤维的段裂数的关系。模拟预报与试验结果比较吻合,表明该应力分析及模拟方法的有效性。
With the increase of external load, the fiber appeared random brittle phenomenon in SFCFT, and under certain load, the number of fiber crack reached “saturation” (that is, fiber section The number of cracks no longer increase), the test commonly used to characterize the interface between the fiber and the matrix properties. In view of this experiment, in this paper, the real performance of the component materials (ie, the elasto-plastic properties of the matrix material) has been fully considered in this paper. The stress-transmission analysis between the fiber and the matrix is made using the elasto-plastic shear lag theory. And interfacial shear stress distribution. On this basis, considering the nonuniformity of fiber strength distribution, the Monte Carlo method was used to simulate the random fracture process of the fiber in the experiment. The load and fiber section The relationship between the number of cracks. The simulation prediction is in good agreement with the experimental results, indicating the effectiveness of the stress analysis and simulation methods.