In situ fibre fracture measurement in carbon-epoxy laminates using high resolution computed tomography
In situ fibre fracture measurement in carbon-epoxy laminates using high resolution computed tomography
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DOI：
10.1016/j.compscitech.2011.06.004
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发表时间：
2011-08-19
影响因子：
9.1
通讯作者：
Spearing, S. M.
中科院分区：
文献类型：
--
作者：
Scott, A. E.;Mavrogordato, M.;Spearing, S. M.
高分辨率同步辐射计算机断层扫描（SRCT）已被用来捕捉碳-环氧树脂缺口[90/0]（s）层压板加载到失败的纤维损伤进展。据作者所知，这提供了在结构相关载荷条件下高性能材料的纤维断裂累积的第一次直接原位测量（即，基本上常规工程层压板的本体内的断裂）。一个高水平的置信度放置在测量中，作为故障过程被视为内部在相关的微机械长度尺度，而不是以前的间接和/或基于表面的方法。虽然纤维断裂是本工作中考虑的主要复合材料损伤机制，但也可以看到在广泛的纤维断裂之前发生基体损伤，例如横向层裂纹、00分裂和分层。在纤维断裂密度水平显著的载荷下，可以看到分裂和分层将缺口附近区域的中心00层与90层分开。纤维断裂最初观察到在孤立的位置，与纤维强度的随机性。在较高的负荷下观察到断裂纤维簇的形成。观察到的最大集群由一组11个断裂和一组14个断裂组成。在最高载荷下，在先前没有断裂的部位观察到大簇，表明它们发生在相对较窄的载荷范围内。基质损伤的位置和纤维断裂之间没有很强的相关性。所获得的数据已在www.materialsdatacentre.com网站上公布，供持续的模型开发和验证之用。(C)2011爱思唯尔有限公司保留所有权利。
High resolution Synchrotron Radiation Computed Tomography (SRCT) has been used to capture fibre damage progression in a carbon-epoxy notched [90/0](s) laminate loaded to failure. To the authors knowledge this provides the first direct in situ measurement of the accumulation of fibre fractures for a high performance material under structurally relevant load conditions (i.e. fractures within the bulk of an essentially conventional engineering laminate). A high level of confidence is placed in the measurements, as the failure processes are viewed internally at the relevant micromechanical length-scales, as opposed to previous indirect and/or surface-based methods. Whilst fibre breaks are the dominant composite damage mechanism considered in the present work, matrix damage, such as transverse ply cracks, 00 splits and delaminations, were also seen to occur in advance of extensive fibre breaks. At loads where fibre break density levels were significant, splitting and delamination were seen to separate the central 00 ply in the near notch region from the 90 plies. Fibre breaks were initially observed in isolated locations, consistent with the stochastic nature of fibre strengths. The formation of clusters of broken fibres was observed at higher loads. The largest clusters observed consisted of a group of eleven breaks and a group of fourteen breaks. The large clusters were observed at the highest load, at sites with no prior breaks, indicating they occurred within a relatively narrow load range. No strong correlation was found between the location of matrix damage and fibre breaks. The data achieved has been made available online at www.materialsdatacentre.com for ongoing model development and validation. (C) 2011 Elsevier Ltd. All rights reserved.