基于THz-TDS的氟橡胶材料寿命预测方法  

Lifetime Prediction Method for Fluororubber Based on Terahertz Time Domain Spectrum Technology

作　　者：王洋 林振衡 郑志杰 谢海鹤 聂泳忠 WANG Yang;LIN Zhen-heng;ZHENG Zhi-jie;XIE Hai-he;NIE Yong-zhong(School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou 350108,China;New Engineering Industry College,Putian University,Putian 351100,China;Xirenma United Measurement and Control(Quanzhou)Technology Co.,Ltd.,Quanzhou 362011,China)

机构地区：[1]福州大学机械工程及自动化学院,福建福州350108 [2]莆田学院新工科产业学院,福建莆田351100 [3]西人马联合测控(泉州)科技有限公司,福建泉州362011

出　　处：《光谱学与光谱分析》2024年第6期1578-1583,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(62103209);福建省科技厅高校产学合作项目(2021H6038)资助。

摘　　要：氟橡胶(FKM)材料具有优异的耐热性、耐腐蚀性、耐油性,已成为航空、航天、石油、机械等领域的热门材料。但由于传统的FKM材料寿命检测方法存在离线检测、会损伤待测材料、检测步骤繁琐、检测效率低等缺点,目前在FKM材料实际应用中往往采用定期更换的办法,易造成材料浪费与经济损失。提出了一种基于太赫兹时域光谱检测技术(THz-TDS)的FKM材料使用寿命预测新方法。首先,通过对在热空气老化箱中经不同温度、不同时长热氧老化处理的FKM材料进行THz-TDS透射检测,获得其对应的时域光谱图,提取相应的电流峰峰值,即在一个透射采样周期中最大的探测电流值与最小的探测电流值之间的差值;再将不同老化温度的FKM材料的THz时域波形的峰峰值与老化时间进行拟合,发现FKM样品时域光谱的峰峰值随着老化时间的延长呈下降趋势,且老化温度越高该下降趋势越明显。在200、300和360℃这三个老化温度下的拟合直线的相关系数分别高达0.9734、0.9821和0.9935。其次,根据阿伦尼乌斯公式的基本思想,建立起以时域光谱峰峰值为参考标准的FKM材料寿命预测数学模型。利用时域光谱峰峰值的FKM材料使用寿命预估办法获得的老化反应速率常数的对数与老化温度倒数关系拟合直线的相关系数达0.9969。最后,采用力学拉伸测量FKM材料断裂伸长率的办法,对其基于THz-TDS的使用寿命预估数学模型中的THz-TDS峰峰值失效临界值进行验证,可得构建的基于THz-TDS的FKM材料使用寿命预估模型成立且正确。研究结果表明:将THz-TDS检测方法应用到FKM材料寿命检测具有较高的准确性,且该方法具有无损、高效、操作简便、适用性广等优点,为FKM材料制品在线检测和寿命预测提供可能性,也为其他非极性材料和电介质材料的寿命预测方法研究提供参考。Fluorine rubber(FKM)material has excellent heat resistance,corrosion resistance,oil resistance and more,making it a popular material in aviation,aerospace,petroleum,machinery and other industries.However,the traditional service life testing method for FKM materials has disadvantages,such as damage to the material to be tested,complicated operation steps,and low testing efficiency.Therefore,in practical applications,FKM is often replaced directly and regularly,but it has a higher possibility of harming the environment by pollution.A new method for predicting the service life of FKM materials using terahertz time-domain spectroscopy(THz-TDS)was proposed.At firstly,Perform THz-TDS detection on the FKM material that has been subjected to different temperatures and different periods in a hot air aging box,obtain its corresponding time-domain spectrum,and extract the corresponding peak-to-peak value,that is,the difference between the maximum detection current value and the minor detection current value in a transmission sampling cycle.Fitting the peak-to-peak value of the THz time-domain waveform of the FKM material with different aging temperatures and the aging time,it could be seen that the peak-to-peak value of the time-domain spectrum of the FKM sample decreases with the aging time,and the higher the aging temperature,the downward trend was more prominent.The correlation coefficients of the fitted straight lines at the three aging temperatures of 200,300 and 360℃were as high as 0.9734,0.9821 and 0.9935,respectively.Secondly,according to the basic idea of the Arrhenius formula,a mathematical model of FKM material life prediction was established with the peak-to-peak value of the time domain spectrum as the reference standard.The correlation coefficient of the fitted straight line of the relationship between the logarithm of the aging reaction rate constant and the reciprocal of the aging temperature obtained using the time-domain spectral peak-to-peak service life estimation method was 0.9969.Finally,the critical

关 键 词：太赫兹时域光谱 氟橡胶 寿命预测 峰峰值 

分 类 号：O433.4[机械工程—光学工程]