On the in-plane deformability of cross-plied unidirectional prepreg
On the in-plane deformability of cross-plied unidirectional prepreg
复制标题
正交单向预浸料面内变形能力研究
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Monica Norrby
中科院分区：
文献类型：
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作者：
Ylva Larberg;M. Åkermo;Monica Norrby
本文提出的工作旨在使用偏置延伸方法研究交叉层压单向预浸料的面内性能。该研究考虑了不同代的碳纤维/环氧树脂材料系统，并在高温下进行测试以增强变形能力。使用数字图像相关性，在测试过程中捕获样本变形和纤维旋转。研究表明，随着变形的继续，大多数交叉层叠的单向材料会以不同的特征长度尺度变形：首先看似连续，后来以带的形式出现。此外，所研究的不同类型的预浸材料的行为也不同；对于一种类型，销接网络理论非常适合，可以简单地估计最终的纤维角度，而对于另两种类型则不然。研究了不同的加载速度和温度，以查明它们对变形能力的影响。
The work presented herein aims to investigate the in-plane properties of cross-plied unidirectional prepreg using the bias extension method. The study considers different generations of carbon fibre/epoxy material systems, and testing is performed at elevated temperatures to enhance the deformability. Using digital image correlation, the specimen deformation and fibre rotation is captured during testing. The study shows that most cross-plied unidirectional material deforms at different characteristic length scales as deformation continues: first seemingly continuous and later in the form of bands. Further, the different type of prepreg materials investigated behaves differently; for one type the pin-jointed net theory fit well, enabling simple estimation of the resulting fibre angle, while for the other two it did not. Different loading speeds and temperatures are investigated in order to pinpoint their influence on the deformability.