Tensile strength and deformation of a two-dimensional carbon-carbon composite at elevated temperatures
Tensile strength and deformation of a two-dimensional carbon-carbon composite at elevated temperatures
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DOI：
10.1111/j.1151-2916.2003.tb03620.x
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发表时间：
2003-12-01
影响因子：
3.9
通讯作者：
Koizumi, T
中科院分区：
文献类型：
--
作者：
Goto, K;Hatta, H;Koizumi, T
研究了二维层压碳/碳复合材料(C/C)在惰性气氛中从室温到2773K的拉伸强度和蠕变行为。随着试验温度的升高，C/C的拉伸强度单调提高。在此温度范围内，低变形速率下的应力-应变曲线呈非线性，但随着试验速度的提高，应力-应变曲线趋于线性，直至完全断裂。由此推断，从1773K开始出现的蠕变变形是C/C表观非线性的来源，并确定了C/C高温强度增强的两种主要机制。第一个来源是吸附水的脱气，在1773K以下对强度的提高起主导作用；第二个来源是蠕变变形。这一现象在高于1773K的温度下非常明显，并且比脱气产生了更大的增强。
Tensile strength and creep behavior of a two-dimensional (2D) laminate carbon-carbon composite (C/C) were examined from room temperature to 2773 K in an inert atmosphere. The tensile strength of the C/C was monotonically enhanced with increasing test temperatures. In particular, significant improvement was observed at temperatures higher than 1773 K. In this temperature range, nonlinear stress-strain curves were observed at low deformation rates, but with increasing test speed, the stress-strain curves became linear until total fracture. The source of the apparent nonlinearity was thus concluded to be creep deformation, Which appeared from 1773 K. Two ruling mechanisms for the strength enhancement of the C/C at elevated temperatures were identified. The first source was degassing of absorbed water, which had a dominant influence on the strength enhancement up to 1773 K. The second was creep deformation. This phenomenon was notable at temperatures higher than 1773 K, and produced much larger enhancement than the degassing.