Beheshtizadeh Nima, Mostafapour Amir
Young Researchers and Elite Club, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran.
Ultrasonics. 2017 Aug;79:1-8. doi: 10.1016/j.ultras.2017.04.001. Epub 2017 Apr 5.
In this article, acoustic emission method was used for monitoring of flexural loading of GFRP (Glass fiber/epoxy composite) and CFRP (Carbon fiber/epoxy composite) via one acoustical sensor. In order to signal processing, various methods were employed such as wavelet transform, Short time Fourier transform, Choi - Williams transform and etc. Using two signal processing methods, wavelet transform and Choi - Williams transform, for monitoring of GFRP and CFRP specimens, determines strengths and weaknesses of each method and appointed the best analysis for signal processing of three point bending load of this type of composites. Based on information obtained from comparing of CFRP and GFRP, it is resulted that, the ratio of elastic modules and maximum load bearing of CFRP to GFRP is 1.36 and 3.25 respectively. Moreover, based on comparing of two analysis method results, Wavelet analysis was appointed better signal processing method for this type of load and material.
在本文中，通过一个声学传感器利用声发射方法监测玻璃纤维增强塑料（GFRP，玻璃纤维/环氧树脂复合材料）和碳纤维增强塑料（CFRP，碳纤维/环氧树脂复合材料）的弯曲载荷。为了进行信号处理，采用了多种方法，如小波变换、短时傅里叶变换、崔-威廉姆斯变换等。使用小波变换和崔-威廉姆斯变换这两种信号处理方法对GFRP和CFRP试样进行监测，确定了每种方法的优缺点，并指定了对这类复合材料三点弯曲载荷进行信号处理的最佳分析方法。基于比较CFRP和GFRP所获得的信息，结果表明，CFRP与GFRP的弹性模量之比和最大承载能力之比分别为1.36和3.25。此外，基于对两种分析方法结果的比较，小波分析被指定为针对这类载荷和材料的更好的信号处理方法。
