Factors controlling the strength of carbon fibres in tension
Factors controlling the strength of carbon fibres in tension
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DOI：
10.1016/j.compositesa.2013.11.007
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发表时间：
2014-02-01
影响因子：
8.7
通讯作者：
Young, Robert J.
中科院分区：
文献类型：
--
作者：
Tanaka, Fumihiko;Okabe, Tomonaga;Young, Robert J.
我们研究了不同类型的碳纤维的断裂机制，在单纤维，裂纹尺寸和断裂韧性的皮芯差异。利用单纤维复合材料的断裂试验，精确地测量了纤维强度分布。中/高模量类型纤维的失效概率被发现是恒定的纤维强度在2-4 GPa的范围内，但相比之下，高模量类型纤维的强度分散减少。通过引入长度在60-200 nm范围内的切口确定的碳纤维的断裂韧性被发现为约1.1 MPa m（1/2）。碳纤维的平均缺陷尺寸随着纤维模量的增加而增加，这表明表面缺陷的裂纹生长发生在数十纳米尺度上。这似乎是碳化处理期间抗拉强度降低的主要原因。(C)2013爱思唯尔有限公司保留所有权利。
We have investigated the fracture mechanisms of different types of carbon fibres, in terms of skin-core differences in single fibres, flaw size and fracture toughness. The fibre strength distribution was measured precisely using the fragmentation test for single-fibre composites. The failure probability for intermediate/high modulus types fibres was found to be constant with fibre strength in the range 2-4 GPa, but in contrast the strength scatter for high modulus type fibres was reduced. The fracture toughness of the carbon fibres, determined by introducing notches with lengths in range 60-200 nm, was found to be about 1.1 MPa m(1/2). The average flaw size of the carbon fibres increased with increasing fibre modulus, suggesting that the crack growth of surface flaws on the tens-of-nm scale occurred. This appears to be the main reason for the reduction in tensile strength during the carbonisation treatment. (C) 2013 Elsevier Ltd. All rights reserved.