In situ observation of kink-band formation in a unidirectional carbon fiber reinforced plastic by X-ray computed tomography imaging
In situ observation of kink-band formation in a unidirectional carbon fiber reinforced plastic by X-ray computed tomography imaging
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DOI：
10.1080/09243046.2014.973173
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发表时间：
2016-01-02
影响因子：
2.9
通讯作者：
Jeong, Tae-Kun
中科院分区：
文献类型：
--
作者：
Ueda, Masahito;Mimura, Kento;Jeong, Tae-Kun
在X射线计算机断层扫描（CT）系统中对单向碳纤维增强塑料（CFRP）矩形试件进行了压缩试验。在加载条件下观察到CFRP的内部压缩破坏。二维纤维微屈曲在试件内发展不均匀，并在一侧局部扩大。纤维断裂开始于侧边，并在整个横截面上传播。由于二维纤维微屈曲，产生了二维扭结带。面外和面内的带宽和带角几乎相同。试样由于二维扭折带而轻微扭曲，宏观上表现为横向和全厚度剪切破坏模式。通过X射线CT成像揭示了单向CFRP试样中的扭结带失效的情况。
A compression test of a unidirectional carbon fiber reinforced plastic (CFRP) rectangular coupon was performed in an X-ray computed tomography (CT) system. Internal compressive failure of the CFRP was observed under loading. Two-dimensional fiber microbuckling developed non-uniformly in the specimen, and enlarged locally at one side. Fiber failure then initiated at the side edge and propagated through the whole cross section. A two-dimensional kink-band developed as a result of two-dimensional fiber microbuckling. The out-of-plane and in-plane band widths and band angles were almost the same. The coupon specimen twisted slightly owing to the two-dimensional kink-band, which resulted, macroscopically, in a transverse and through-thickness shear failure mode. The scenario of kink-band failure in a unidirectional CFRP coupon was revealed by X-ray CT imaging.