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在0.1～0.6MPa热压压力条件下,制备了不同孔隙率含量的玻璃纤维布/618环氧树脂层压板试件。采用超声C扫描及烧蚀密度法测定了试件的超声衰减系数与平均孔隙率,并通过金相显微分析对孔隙的分布、形状及尺寸进行了表征。讨论了孔隙率对层压板拉伸、弯曲和层间剪切性能及超声衰减系数的影响规律,获得了使力学性能下降的临界孔隙率及衰减系数值。结果表明,随着固化压力减小,孔隙率从0.976%增加到5.268%,抗拉强度、弯曲强度和层间剪切强度均下降,衰减系数由1.460dB.mm-1增加到2.150dB.mm-1,使力学性能下降的临界衰减系数约为1.5dB.mm-1。
Under the condition of hot pressure of 0.1 ~ 0.6MPa, glass fiber cloth / 618 epoxy resin laminates with different porosity content were prepared. Ultrasonic C-scan and ablation density method were used to determine the ultrasonic attenuation coefficient and average porosity. The distribution, shape and size of the pores were characterized by metallographic analysis. The influence of porosity on the tensile, flexural and interlaminar shear properties and ultrasonic attenuation coefficient of the laminates was discussed. The critical porosity and the attenuation coefficient were obtained. The results show that as the curing pressure decreases, the porosity increases from 0.976% to 5.268%, the tensile strength, flexural strength and interlaminar shear strength decrease, and the attenuation coefficient increases from 1.460dB.mm-1 to 2.150dB.mm -1, so that the mechanical properties of the critical attenuation coefficient of about 1.5dB.mm-1.