摘要
基于材料超声检测系统模型及功率谱分析,考察了碳纤维增强环氧树脂基(CFRP)复合材料的孔隙率(0.03%～2.3%)与主频、中心频率、加权功率谱频率、有限频带能量(F_(LFB))及主频对应的能量(E_(PF))等参数之间的相关性。结果表明:孔隙率在0.03%～0.67%范围内时,E_(LFB)与孔隙率呈线性递减关系;在0.67%～2.3%范围内,两者呈二次曲线递减关系;E_(PF)与孔隙率的关系在0.64%左右两侧分别呈现出线性和二次曲线递减趋势。E_(LFB)和E_(PF)能有效表征CFRP的孔隙率。
The relationship between porosity of carbon fiber reinforced polymer from 0. 03% to 2. 3% and characteristic parameters, such as principle frequency, central frequency, frequency of weighted power spectrum, energy for limited frequency band （ELFB） and energy for principle frequency （EPF）, was investigated based on the ultrasonic testing system model and the power spectrum analysis method for composite materials. The correlation between porosity, ELFB and EPF was mainly analyzed quantitatively. The results showed that ELra decreased linearly when the porosity increased from 0. 03% to 0. 67%, while ELFB decreased according to quadratic equation when the porosity increased from 0. 67% to 2. 3% ; the correlation between porosity and Ew changes from linear to quadratic curve when the porosity exceeded 0. 64%;The changing of CFRP porosity can be characterized by ELFB and EPF effectively.
出处
《理化检验（物理分册）》
CAS
2010年第3期159-163,170,共6页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
