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首页> 外文会议>Proceedings of the American Society for Composites Twenty-Ninth technical conference, Proceedings of the 16th US-JAPAN conference on composite materials ASTM-D30 meeting >The Effect of Curing Temperature on the Fracture Toughness of Fiberglass Epoxy Composites
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The Effect of Curing Temperature on the Fracture Toughness of Fiberglass Epoxy Composites

机译：固化温度对玻璃纤维环氧树脂复合材料断裂韧性的影响

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摘要

The curing reaction in a thermoset polymer matrix composite is often acceleratedrnby the addition of heat in an oven or autoclave. The heat added increases the rate ofrnthe polymerization reaction and cross-linking in the material. The cure cycle usedrn(temperature, pressure and time) can therefore alter the final material properties. Thisrnresearch focuses on how the curing temperature (250, 275, 300 °F) affects the yieldrnstrength and the mode Ⅰ interlaminar fracture toughness, G_I, of a unidirectional S-2rnglass epoxy composite. The test method that was used for the tension test was ASTMrnD3039 and the test method for the mode Ⅰ interlaminar fracture toughness, the doublerncantilever beam (DCB) test, was ASTM D5528. The DCB specimens were fabricatedrnwith a non-adhesive insert at the midplane of the composite that serves as the initiatiorrnof the delamination. Opening forces were then applied to the specimen, causing therncrack propagation. The results show that increasing the cure temperature by 50 °Frnincreased the tensile strength by 10% (86.54 - 94.73 ksi) and decreased the fracturerntoughness 20% (506.23 - 381.31 J/m~2). Thus, the curing temperature can cause arntrade-off between these two properties, which means that the curing cycle will need tornbe altered based on the intended use and the required material properties.
机译：通常通过在烘箱或高压釜中加热来促进热固性聚合物基复合材料中的固化反应。添加的热量增加了材料中聚合反应和交联的速率。因此，所用的固化周期（温度，压力和时间）可以改变最终的材料性能。这项研究的重点是固化温度（250、275、300°F）如何影响单向S-2玻纤复合材料的屈服强度和Ⅰ型层间断裂韧性G_I。用于拉伸测试的测试方法是ASTMrnD3039，用于Ⅰ型层间断裂韧性的测试方法（双悬臂梁（DCB）测试）是ASTM D5528。 DCB样品是在复合材料的中平面处使用非粘性插入件制造的，该插入件用作分层的初始方法。然后将张开力施加到样品上，导致裂隙扩展。结果表明，将固化温度提高50°F，抗拉强度提高10％（86.54-94.73 ksi），断裂韧性降低20％（506.23-381.31 J / m〜2）。因此，固化温度可能导致这两种性能之间的折衷，这意味着需要根据预期用途和所需的材料性能来改变固化周期。

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