采用50D中空涤纶长丝埋入复合材料,模拟复合材料的孔隙,制备孔隙率标准试块。通过制备三种厚度(1.5,3.0和5.0mm)和五种孔隙率(0~5.76%)的碳纤维增强环氧树脂复合材料,采用超声C扫描测定不同孔隙率下复合材料的超声衰减,并和波音公司的标准试块进行了对比。研究了涤纶排列密度和在厚度方向上的排列位置对复合材料超声衰减的影响。结果表明,制备的标准试块和波音公司标准试块具有良好的一致性,用涤纶中空纤维模拟复合材料的孔隙率是可行的；随着涤纶排列密度的增加,孔隙率增加,超声衰减增加；在孔隙率不变的情况下,涤纶分布在不同的厚度位置上时,其复合材料的超声衰减基本一致。
50D hollow polyester filaments were used to be embedded the composite materials simulating the porosi-ty of the composites,which was used as standard test blocks.Carbon fiber reinforced epoxy resin composites were prepared with three kinds of thicknesses(1.5,3.0 and 5.0 mm)and five kinds of void contents (0-5.76%).Ultra-sonic C-scan was adopted to measure the ultrasonic attenuation of the composites with different void contents. Testing results were compared with the results using Boeing Co.’s standard test block.The effect of arrangement density and position of polyester filament on ultrasonic attenuation of the composites were studied.The results show that there is a good consistency between the standard test block made in this paper and Boeing Co.standard test block,and using hollow polyester filament is feasible to simulate the porosity of composites.The void content and ultrasonic attenuation increase with the arrangement density.The ultrasonic attenuation keeps stable when the position of polyester filament in thickness direction changes.
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