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Tension Behavior Of Unidirectional Glass/epoxy Composites Under Different Strain Rates

机译：单向玻璃/环氧树脂复合材料在不同应变速率下的拉伸行为

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摘要

By considering wide applications of composite materials, having a proper knowledge of them under dynamic loading is necessary. In order to study the effects of strain rates on the behavior of the materials, special testing machines are needed. Most of the research in this field is focused on applying real loading and gripping boundary conditions on the testing specimens. In this study, behavior of unidirectional glass fiber reinforced polymeric composites under uni-axial loading is determined at quasi-static and intermediate strain rates of 0.001-100 s~(-1). The tests were performed using a servo-hydraulic testing apparatus equipped with a strain rate increase mechanism. For performing the tests, a jig and a fixture are designed and manufactured. The performance of the test jig was evaluated and found to be adequate for testing of composites. Dynamic tests results are compared with the results of static tensile tests carried out on specimens with identical geometry. Experimental results show a significant increase of the tensile strength by increasing the strain rate. The tensile modulus and strain to failure are also observed to increase slightly by increasing the strain rate.
机译：通过考虑复合材料的广泛应用，有必要在动态载荷下对它们有适当的了解。为了研究应变速率对材料性能的影响，需要专用的测试机。该领域中的大多数研究都集中在对试样施加实际载荷和抓紧边界条件上。在这项研究中，单向玻璃纤维增​​强聚合物复合材料在单轴载荷下的行为是在准静态和0.001-100 s〜（-1）的中间应变速率下确定的。使用配备有应变率增加机构的伺服液压测试设备进行测试。为了进行测试，设计并制造了夹具和固定装置。评估了测试夹具的性能，发现该性能足以测试复合材料。将动态测试结果与对具有相同几何形状的样本进行的静态拉伸测试结果进行比较。实验结果表明，通过提高应变速率可以显着提高抗拉强度。还观察到拉伸模量和破坏应变通过增加应变速率而略有增加。

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