A test device for damage characterisation of composites based on in situ computed tomography
A test device for damage characterisation of composites based on in situ computed tomography
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DOI：
10.1016/j.compscitech.2012.05.007
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发表时间：
2012-07-23
影响因子：
9.1
通讯作者：
Andrich, M.
中科院分区：
文献类型：
--
作者：
Hufenbach, W.;Boehm, R.;Andrich, M.
对于复合材料的工程设计，需要合适的损伤模型来预测损伤的开始、连续的破坏和随后的力学性能的降低。为了验证现有的建模方法，对特定的损伤实体进行明确的实验识别是一个必要条件。然而，由于非均质纺织复合材料等新型材料破坏机理的复杂性，全面的损伤分析仍然是一个具有挑战性的问题。计算机层析成像领域的最新进展使原位测量能够检测复合材料在载荷作用下的损伤现象。本文描述了一种将综合试验机与高精度计算机断层扫描仪相结合的新型试验装置。用原位方法研究了由纬编和机织预制体制成的碳纤维增强塑料(CFRP)的损伤演化。特别关注了在厚度方向加载下的损伤过程。为此，根据ASTM D 7291制造了圆柱形拉伸试件并进行了测试。采用不同高宽比的压缩试件对碳纤维编织复合材料的压缩破坏进行了研究。针对现场测试方法的可能性和局限性，对实验结果进行了讨论。(C)2012爱思唯尔有限公司。保留所有权利。
For engineering design of composites, suitable damage models are required which have to predict the onset of damage, the successive failure and the subsequent reduction of the mechanical properties. To verify existing modelling approaches, the clear experimental identification of the particular damage entities is an essential condition. However, due to the complexity of the failure mechanisms of novel materials like heterogeneous textile composites, a comprehensive damage analysis is still a challenging problem. Recent progress in the field of computed tomography enables in situ measurements to detect damage phenomena in composites under loading. The article describes such a novel test device that combines an integrated testing machine with a high precision computer tomograph. The in situ method was used to study the damage evolution in carbon fibre reinforced plastics (CFRPs) made of weft knitted and woven preforms. A special focus was set to damage processes under loading in thickness direction. For this purpose, cylindrical tensile specimens according to ASTM D 7291 were manufactured and tested. Compression specimens with different aspect ratios have been used to study the compressive failure of CFRP woven composites. The experimental results are discussed with respect to the possibilities and limitations of the in situ based test method. (C) 2012 Elsevier Ltd. All rights reserved.