Characterization of mechanical properties of randomly oriented strand thermoplastic composites
Characterization of mechanical properties of randomly oriented strand thermoplastic composites
复制标题
DOI：
10.1177/0021998315613129
复制
发表时间：
2016-08-01
影响因子：
2.9
通讯作者：
Lessard, Larry
中科院分区：
文献类型：
--
作者：
Selezneva, Marina;Lessard, Larry
航空航天工业中出现了一种新的兴趣，即使用不连续的纤维碳/聚醚醚酮模塑系统(通过将单向胶带切割成股来获得)来制造具有复杂几何形状的部件。这种类型的材料体系被称为随机取向纤维复合材料，它弥补了连续纤维复合材料缺乏成形性和短纤维复合材料缺乏性能之间的差距，因此在结构应用中具有很大的吸引力。本研究的目的是研究随机取向钢绞线复合材料的力学性能(拉伸、压缩、剪切和疲劳)，并量化钢绞线尺寸对其性能的影响。总体而言，发现性质是高度可变的，并依赖于链的长度。有趣的是，拉伸、压缩和剪切强度具有相似的大小，并表现出相同的破坏机制(链条断裂和剥离)。这项实验工作扩展了随机取向链状复合材料的知识库。
There is an emerging interest in the aerospace industry to manufacture components with intricate geometries using discontinuous fibre carbon/polyether-ether-ketone moulding systems (obtained by cutting unidirectional tape into strands). This type of material system is termed randomly oriented strand composites and is appealing for structural applications as it bridges the gap between the lack of formability of continuous fibre composites and the lack of performance of short fibre composites. The objective of this study was to investigate mechanical properties (tensile, compressive, shear and fatigue) of randomly oriented strand composites and to quantify the effect of strand size on their properties. Overall, properties were found to be highly variable and dependent on the strand length. Interestingly, tensile, compressive and shear strength had similar magnitudes and exhibited the same failure mechanisms (strand fracture and debonding). This experimental work expands the knowledge base for randomly oriented strand composite materials.