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Effects of cure cycles on void content and mechanical properties of composite laminates

机译：固化周期对复合材料层压板孔隙率和力学性能的影响

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摘要

Various curing cycles were designed to evaluate the effects of different pressure induced voids on some mechanical properties of carbon/epoxy laminates and optimum cure pressure time. A series of [0/90]_(3s) laminates with varying void contents were fabricated and a characterization of void distribution, size, and shape within the laminates was obtained using ultrasonic c-scan and optical metallography techniques. Short beam shear, three-point flexure and tensile testing were used for mechanical evaluation and the results correlated to void volume fraction and ultrasonic absorption coefficient. The experimental results have shown that there exists an optimum time for applying pressure. The proposed grading evaluation method of ultrasonic inspection is helpful for the nondestructive examination of composites. Also, changes in mechanical performance due to porosity are consistent with previously published studies.
机译：设计了各种固化周期，以评估不同压力引起的空隙对碳/环氧树脂层压板的某些机械性能和最佳固化压力时间的影响。制备了一系列具有不同孔隙含量的[0/90] _（3s）层合物，并使用超声c扫描和光学金相技术获得了层合物中空隙分布，尺寸和形状的表征。短梁剪切，三点弯曲和拉伸试验用于力学评估，其结果与空隙体积分数和超声吸收系数相关。实验结果表明存在施加压力的最佳时间。提出的超声检查分级评价方法有助于复合材料的无损检测。另外，由于孔隙率引起的机械性能变化与先前发表的研究一致。

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