单向碳/碳复合材料高温拉伸行为失效机理研究

复合材料科学与工程 ›› 2021, Vol. 0 ›› Issue (2): 89-94.

单向碳/碳复合材料高温拉伸行为失效机理研究

陈波¹, 翁少东², 温卫东³, 杨兴林¹

1.江苏科技大学能源与动力学院,镇江212003;
2.西安电子科技大学机电工程学院,西安710071;
3.南京航空航天大学能源与动力学院,南京210016

收稿日期:2020-07-22 出版日期:2021-02-28 发布日期:2021-03-10
作者简介:陈波(1986-),男,博士,主要从事碳/碳复合材料高温强度与疲劳断裂方面的研究,chenbocepe@just.edu.cn。
基金资助:
江苏科技大学科研启动资金(1142931905)

FAILURE MECHANISM OF UNIDIRECTIONAL CARBON/CARBON
COMPOSITES AT HIGH TEMPERATURE

CHEN Bo¹, WENG Shao-dong², WEN Wei-dong³, YANG Xing-lin¹

1. College of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
2. School of Mechano-Electronic Engineering, Xidian University, Xi′an 710071, China;
3. Nanjing University of Aeronautics and Astronautics, College of Energy and Power, Nanjing 210016, China

Received:2020-07-22 Online:2021-02-28 Published:2021-03-10

摘要/Abstract

摘要： 碳/碳复合材料是一种耐高温、耐摩擦的新型复合材料。为了研究碳/碳复合材料在高温环境拉伸载荷作用下的损伤和失效机理,针对有、无抗氧化涂层(以下简称“涂层”)[0]₁₆单向板碳/碳复合材料,开展了700 ℃下轴向拉伸测试,并对相应试验件的断口进行了SEM显微观测分析。拉伸试验结果表明:有涂层单向碳/碳复合材料在700 ℃下的应力-应变曲线呈线性,相比于室温,700 ℃下有涂层单向碳/碳复合材料的拉伸强度和弹性模量均得到了强化;无涂层单向碳/碳复合材料在700 ℃下的应力-应变曲线呈高度非线性,相应的力学性能下降明显。显微观测结果表明:试验700 ℃下有涂层单向碳/碳复合材料纤维束损伤形式为纤维束内纤维拉伸破坏、基体开裂和纤维拔出破坏;无涂层单向碳/碳复合材料纤维束断口变细且呈散状分布。

关键词: 碳/碳复合材料, 高温拉伸, 力学行为, 损伤机理, 失效分析

Abstract: Carbon/carbon composite material is a new type of composite material with high temperature and friction resistance. In order to investigate the damage and failure mechanism of carbon/carbon composites under tensile load at high temperature, axial tensile test of [0]₁₆ unidirectional laminate carbon/carbon composites with anti-oxidation coating(hereinafter referred to as coating) and [0]₁₆ unidirectional laminate carbon/carbon composites without coating were carried out at 700 ℃. The fracture of corresponding test parts was observed and analyzed under SEM. The fractures of specimens were analyzed by SEM. The tensile test results show that the stress-strain curves of unidirectional carbon/carbon composites with coating at 700 ℃ are linear, and the tensile strength and elastic modulus of unidirectional carbon/carbon composites with coating at 700 ℃ are enhanced compared with room temperature. The stress-strain curves of uncoated unidirectional carbon/carbon composites at 700 ℃ are highly nonlinear and the corresponding mechanical properties decrease obviously. The results of microscopic observation show that the damage forms of unidirectional carbon/carbon composite fiber bundle with coating at 700 ℃ include tensile failure, matrix crack and fiber pulling out. Fiber bundles become thin and distributed for carbon/carbon composite without coating at 700 ℃.

Key words: carbon/carbon composites, high temperature tensile, mechanical behavior, damage mechanism, failure analysis

中图分类号:

TB332

陈波, 翁少东, 温卫东, 杨兴林. 单向碳/碳复合材料高温拉伸行为失效机理研究[J]. 复合材料科学与工程, 2021, 0(2): 89-94.

CHEN Bo, WENG Shao-dong, WEN Wei-dong, YANG Xing-lin. FAILURE MECHANISM OF UNIDIRECTIONAL CARBON/CARBON
COMPOSITES AT HIGH TEMPERATURE[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(2): 89-94.

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