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首页> 外文期刊>Mechanics of composite materials >THE INFLUENCE OF MULTIPLE NESTED LAYER WAVINESS ON THE COMPRESSION STRENGTH OF DOUBLE NESTED WAVE FORMATIONS IN A CARBON FIBER COMPOSITE LAMINATE
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THE INFLUENCE OF MULTIPLE NESTED LAYER WAVINESS ON THE COMPRESSION STRENGTH OF DOUBLE NESTED WAVE FORMATIONS IN A CARBON FIBER COMPOSITE LAMINATE

机译：多层复合波纹对碳纤维复合材料双嵌套波形成抗压强度的影响

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摘要

As advanced composite materials having superior physical and mechanical properties are being developed, the optimization of their processing techniques is eagerly sought. One of the most common defects arising during processing of structural composites is layer waviness. The layer waviness is more pronounced in thick-section flat and cylindrical laminates, which are extensively used in large wind turbine blades, submersibles, and space platforms. The layer waviness undulates the entire layer of a multidirectional laminate in the throughthe-thickness direction, leading to a gross deterioration of its compressive strength. This research investigates the influence of multiple layer waviness in a double nest formation on the compression strength of a composite laminate. Different wave fractions of wavy 0A degrees layers were fabricated in an IM/8551-7 carbon-epoxy composite laminate on a steel mold by using a single-step fabrication procedure. The test laminates were cured on a heated press according to the specific curing cycle of epoxy. Their static compression testing was performed using a NASA short block compression fixture on an MTS servohydraulic machine. The purpose of these tests was to determine the effects of multiple layer wave regions on the compression strength of the composite laminate. The experimental and analytical results obtained revealed that the reduction in the compression strength of composite laminate was constant after the fraction of the wavy 0A degrees layers exceeded 35%. This analysis indicated that the percentage of the 0A degrees wavy layer may be used to estimate the reduction in the compression strength of a double nested wave formation in a composite laminate.
机译：随着具有优良物理和机械性能的先进复合材料的开发，人们急切地寻求其加工技术的优化。在结构复合材料加工过程中出现的最常见缺陷之一是层波纹度。层波纹在厚截面的平面和圆柱形层压板中更为明显，这些层压板广泛用于大型风力涡轮机叶片，潜水器和太空平台。层波纹在整个厚度方向上使多向层压板的整个层起伏，导致其抗压强度明显下降。这项研究调查了双层起伏中多层波纹度对复合材料层压板抗压强度的影响。通过使用单步制造程序，在钢模上的IM / 8551-7碳-环氧复合层压板中制造了0A度波纹状波的不同波分数。根据环氧树脂的特定固化周期，将测试层压板在热压机上固化。他们的静态压缩测试是在MTS伺服液压机上使用NASA短块压缩夹具进行的。这些测试的目的是确定多层波区域对复合材料层压板抗压强度的影响。获得的实验和分析结果表明，在波浪形0A度层的份额超过35％之后，复合层压板的抗压强度降低是恒定的。此分析表明，0A度波浪层的百分比可用于估计复合材料叠层中双嵌套波形成的压缩强度的降低。

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