基于AE技术和HHT的涤纶机织物拉伸断裂过程研究

Research on tensile fracture process of polyester woven fabric based on AE technique and HHT

为了获取与研究织物拉伸破坏模式的时频特征,通过改变织物组织结构和纬纱密度织造4种不同织物,在常规织物强力仪上利用自主搭建的声发射检测系统,分别采集对应织物拉伸破坏过程中产生的动态声频信息,利用Matlab软件运行基于HHT方法编译的程序对所采集信息进行信号分析与处理。分析结果表明:织物拉伸过程的AE信号曲线与拉伸载荷-位移曲线完全对应,所表征的结构相变化、纱线形变以及纱线断裂3个破坏模式可明显区分;4种织物结构相变化阶段特征频率相同,均为100Hz,且来自同一来源——经纬纱间正交摩擦,与织物组织、密度无关,表现在持续时间、幅值、能量等声发射信号参量上,结构相变化阶段与纱线强力利用系数大小有关。

In order to obtain and study time-frequency characteristics of fabric tensile failure modes,four kinds of fabrics is woven with changing different fabric organizational structures and weft densities,dynamic audio signals for different fabrics in tensile failure process is collected with the aid of self-built acoustic emission detection system on the conventional fabric tensile tester,and the collected signal is analyzed and processed by using Matlab software to run a program compiled based on Hilbert Huang transform.The results show that AE signal curve is completely corresponding to tensile load-displacement curve in fabric tensile process,and characterizations of three failure modes about structure change,yarn deformation,and yarn fracture can be clearly distinguished.The characteristic frequency of four kinds of fabrics in structure change stage is the same as100 Hz,which can be derived from the same source（orthogonal friction of yarns）,and has nothing to do with the fabric organizational structure or density.The structure change stage has something to do with yarn strength utilization in such aspects as the AE signals characteristics of duration,amplitude,energy,and so on.