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玻璃纤维复合材料孔隙率对超声衰减系数及力学性能的影响

, PP. 69-75

Keywords: 玻璃纤维复合材料,孔隙率,超声检测,衰减系数,力学性能

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Abstract:

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。

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