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首页> 外文期刊>Polymer Composites >E-Glass/DGEBA/m-PDA single fiber composites: Interface debonding during fiber fracture
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E-Glass/DGEBA/m-PDA single fiber composites: Interface debonding during fiber fracture

机译：E-玻璃/ DGEBA / m-PDA单纤维复合材料：纤维断裂时的界面剥离

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摘要

In this paper, we examine the regions of debonding between the fibers and the matrix surrounding fiber breaks formed during single fiber fragmentation tests. The fiber breaks are accompanied by areas of debonding between the matrix and the surface of the fiber. With increasing applied strain, the lengths of these debonded regions generally increase. At the end of the test, the matrix tensile strain adjacent to the debond regions is an order of magnitude higher than the applied strain (40% vs. 4%). Although the debond edges typically remain attached at the same locations on the fiber fragments, debond propagation along fiber fragments under increasing strain has been observed in some cases. The phenomenon is termed secondary debond growth, and two mechanisms that trigger secondary debond region growth have been proposed. As expected, tests with bare fibers and with fibers coated to alter interface adhesion indicate that the average size of debonded regions at the end of the test increases as the calculated interfacial shear strength decreases. However, a decrease in the "apparent" interfacial shear strength resulting from an increase in testing rate results in a decrease in the size of the average debond region. This result suggests an increase in the amount of energy stored in the matrix from the fiber fracture process.
机译：在本文中，我们检查了在单纤维断裂测试过程中形成的纤维与基质周围纤维断裂之间的剥离区域。纤维断裂伴随着基质与纤维表面之间的剥离区域。随着施加应变的增加，这些剥离区域的长度通常增加。在测试结束时，与剥离区域相邻的基体拉伸应变比施加的应变高出一个数量级（40％对4％）。尽管脱粘边缘通常保持附着在纤维碎片上的相同位置，但是在某些情况下已经观察到在增加的应变下沿着纤维碎片的脱粘传播。这种现象被称为次级脱胶生长，并且已经提出了触发次级脱胶区域生长的两种机制。不出所料，使用裸露的纤维和涂有涂层的纤维改变界面附着力的测试表明，随着计算的界面剪切强度的降低，测试结束时脱胶区域的平均尺寸会增加。然而，由于测试速率的增加而导致的“表观”界面剪切强度的降低导致平均脱胶区域的尺寸减小。该结果表明纤维断裂过程中存储在基质中的能量增加。

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