基于激光加热和DIC技术的C/C复合材料热膨胀系数测量实验  

Measurement of Thermal Expansion Coefficient of C/C Composites Based on Laser Heating and DIC Technology

作　　者：汪由胜 王家伟 王立君 陈正阁 薛全喜 黄珂 WANG Yousheng;WANG Jiawei;WANG Lijun;CHEN Zhengge;XUE Quanxi;HUANG Ke(National Key Laboratory of Laser Interaction with Matter,Xi’an 710024,China)

机构地区：[1]激光与物质相互作用全国重点实验室,西安710024

出　　处：《现代应用物理》2024年第2期202-208,共7页Modern Applied Physics

基　　金：激光与物质相互作用全国重点实验室基金资助项目(SKLLIM2302)。

摘　　要：针对传统的热膨胀系数测量方法实验时间长、测试温度低及难以适用于有氧环境等缺点,提出了基于连续激光加热和数字图像相关技术联用实现C/C复合材料高温升速率下的热膨胀系数测量方法。实验分别获取了激光诱导高温升率有氧环境下针刺型和3维编织型两类C/C复合材料从室温至约1000℃的热膨胀系数。研究结果表明,针刺型和3维编织型C/C复合材料的热膨胀系数随着温度的升高虽然存在一定的差异,但在纤维增强的方向热膨胀系数总体较小。提出的热膨胀系数测量方法具有实验效率高、温升速率高、适合有氧环境等优点,可用于表征C/C复合材料等耐高温材料的高温热力学性能。In view of the disadvantages of the traditional thermal expansion coefficient measurement method,such as long experimental time,low test temperature,and difficulty to apply to aerobic environment,the thermal expansion coefficient measurement method of C/C composite material is proposed based on continuous laser heating and digital image correlation(DIC)technology.The thermal expansion coefficients of two types of C/C composites,namely needle-punched and three-dimensional woven,are obtained under laser-induced high-temperature ramp rate and aerobic environment from room temperature to approximately 1000℃.The results show that the coefficients of thermal expansion for the needle-punched and three-dimensional woven types are generally smaller in the direction of fibre reinforcement,although there are some differences with increasing temperatures.The method proposed here for measuring thermal expansion coefficient has several advantages,including high experimental efficiency,high temperature rise rate,and suitability for aerobic environments.This method is of great significance for characterising the high-temperature thermomechanical properties of high-temperature resistant materials such as C/C composites.

关 键 词：C/C复合材料 热膨胀系数 激光加热 高温升速率 数字图像相关技术 

分 类 号：TN249[电子电信—物理电子学] O43[机械工程—光学工程]