An analytical assessment of using the losipescu shear test for hybrid composites
An analytical assessment of using the losipescu shear test for hybrid composites
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DOI：
10.1016/s1359-8368(02)00022-7
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发表时间：
2002-09
影响因子：
13.1
通讯作者：
M. Chiang;Jianmei He
中科院分区：
文献类型：
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作者：
M. Chiang;Jianmei He
Iosipescu测试（V形切口剪切测试）的适用性的理论评估已经进行了混合复合材料具有单向玻璃和碳纤维丝束，紧密混合，而不是被安排在单独的层。采用基于纤维束特性的有限元方法对混杂复合材料的v型切口试样进行了分析，研究了混杂材料中不同的微观结构对剪切应力和应变状态的影响。进行分析，以确定如何密切的测试将满足一个理想的剪切试验的要求，应该有纯粹的和均匀的应力和应变分布在测试区域。研究表明，在理论上，V型切口试验可以用来确定混杂复合材料的剪切模量时，它是正确的使用。然而，实际上，由缺口根部附近的应力集中引起的过早失效可以使得测试不期望用于确定混杂复合材料的剪切强度。
A theoretical evaluation of the applicability of the Iosipescu test (v-notch shear test) has been conducted for hybrid composites having unidirectional glass and carbon fiber tows that are intimately mixed, instead of being arranged in separate lamina. The v-notch specimen of hybrid composites was analyzed using the finite element method based on the fiber tow properties to evaluate the effect of varied microstructures in hybrids on the shear stress and strain states. The analyses were conducted to determine how closely the test would meet the requirement of an ideal shear test that there should be pure and uniform stress and strain distributions in the test region. The study shows that, theoretically, the v-notch test can be used to determine the shear modulus of the hybrid composites studied when it is correctly used. However, practically, premature failures caused by the stress concentrations near the notch roots can make the test undesirable for determining the shear strength of the hybrid composite.