摘要
从碳纤维复合材料孔隙率的超声脉冲检测原理出发，在假设其它缺陷的影响已在定性分析中排除、或以当量及修正的方式引入的前提下，对于根据孔隙直径适当给定的检测频率，建立材料的超声衰减模型，并导出超声衰减系数与材料和孔隙缺陷的主要参数之间的理论与统计关系，为建立新的检测方法提供理论支撑，改变现有检测方法的检测结果与理论模型的不一致现象。其中作为中间结果之一所建立的碳纤维声衰减模型及相应导出的声衰减系数与碳纤维含量和碳纤维半径之间的关系，不仅可服务于本文的直接应用目标，而且对于基于超声衰减原理的纤维增强复合材料无损检测的其它方面也具意义。作为中间结果之二所建立的分布孔隙率超声衰减模型，考虑到材料中的孔隙按其半径分布，而不同半径范围的孔隙表现出相异的声衰减特性这一实际情况，在由单一半径孔隙率声衰减模型导出的理论关系中引入了孔隙率与孔隙半径相关关系的统计特征。
Void content non destructive evaluation oriented, an ultrasonic attenuation model of carbon fibre reinforced plastics with voids is presented. A relationship formula between the ultrasonic attenuation, the main parameters of the material and the voids contained is also given. The model and the formula give support to a new method for non destructive evaluation of void content of carbon fibre reinforced plastics in our next paper. As a partial result, a sub model of ultrasonic attenuation of fibre within plastics is established. The relationship between the ultrasonic attenuation and content and the radius of fibre is accordingly derived out and presented. Another partial result gives a sub madel of attenuation due to the so called distributed voids, in which it is considered that the content of voids is relative to their sizes ( e.g . radius of voids) and the property is different in different void sizes. So the statistics property of the distribution of the sizes of the voids is introduced into the single radius based model.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
1997年第3期99-106,共8页
Acta Materiae Compositae Sinica
基金
国家自然科学基金
国家教委博士学科点专项基金
关键词
碳纤维
复合材料
孔隙率
超声波衰减
carbon fiber reinforced plastics, void content, non destructive evaluation, ultrasonic attenuation, theoretic model
