PE-UHMW／PE-LD层合板损伤声发射信号频率特征研究

Frequency Characteristics of AE Signal During Damage Process of PE-UHMW/PE-LD Laminates

为揭示聚乙烯自增强复合材料(PE-UHMW/PE-LD)不同损伤模式的声发射信号频率特征,通过对基体、单纤维复合材料、90°单向板、+45°/-45°层合板的拉伸破坏,分别诱导产生基体损伤、纤维断裂、纤维/基体界面损伤和层间损伤的AE信号,并和非损伤AE信号(环境噪声、断铅模拟)频率特征进行了对比。实验结果表明,非损伤AE信号和损伤AE信号之间均具有不同的峰值频率和频率分布特征。

In order to reveal frequency characteristics of acovstic emission （AE） signal from different damage modes of self-reinforced polyethylene （PE） composites （PE-UHMW/PE-LD）, damage （matrix damage, fiber breakage, interface damage, and delaminating） and non-damage （environment noise and pencil lead break test） signals were extracted from PE-LD resin, filament composite, 90°laminate, and ＋45 /-45 laminates. The difference between damage and non- damage AE signals in was identified. These results could be used to investigate damage mechanisms of sel＆reinforced PE composites.