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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。
Using 50D hollow polyester filament embedded in the composite material to simulate the porosity of the composite material to prepare a porosity standard test block. The ultrasonic attenuation of composites at different porosities was determined by ultrasonic C-scan by preparing carbon fiber reinforced epoxy composites of three thicknesses (1.5, 3.0 and 5.0 mm) and five porosities (0 to 5.76%) and Boeing’s standard test block is compared. The influence of the arrangement density of polyester fibers and the arrangement position in the thickness direction on the ultrasonic attenuation of the composites was studied. The results show that the prepared standard test blocks have good consistency with the standard test blocks of Boeing Company. It is feasible to simulate the porosity of the composites with the polyester hollow fiber. With the increase of the density of the polyester, the porosity increases and the ultrasonic attenuation increases. Under the condition of constant porosity, the ultrasonic attenuation of the composite material is basically the same when the polyester is distributed at different thickness positions.