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针对4层“钢-铅-钢-铅”的粘接结构,分别采用红外热像法、激光超声成像法和中子照相法等进行非接触检测,并对其优势和劣势进行了分析。研究结果表明:红外热像法能实现“钢-铅”粘接结构的非接触检测,但检测时加载的强烈热信号降低了缺陷信号的信噪比,使图像清晰度及大小的准确定量受到影响,需改进电磁热激励线圈的设计,并采用仿真建模分析解决上述问题;激光超声成像法能有效检测出2层粘接结构中准2以上的脱粘缺陷,但对于多层粘接结构需通过更加复杂有效的缺陷特征信号分析和提取方法等达到目的;中子照相法在检测“钢-铅”结构中的EP(环氧树脂)胶粘剂分布方面具有特殊优势,能检测出4层“钢-铅”粘接结构中准1的脱粘缺陷,是一种较理想的检测方法。
For the 4-layer “steel-lead-steel-lead” bonding structure, non-contact detection was carried out by infrared thermography, laser ultrasonic imaging and neutron radiography respectively, and its advantages and disadvantages were analyzed . The results show that the infrared thermography method can realize the non-contact detection of the “steel-lead” bonding structure, but the intense heat signal applied during the inspection reduces the signal-to-noise ratio of the defect signal and makes the image sharpness and size accurate Quantitatively affected, the design of electromagnetic induction coil needs to be improved, and the simulation modeling analysis is used to solve the above problems. The laser ultrasonic imaging method can effectively detect the debonding defects more than 2 in the two-layer adhesive structure, The structure of the junction needs to be achieved through more complicated and effective signal analysis and extraction methods of defect signatures. The neutron photographic method has the special advantage of detecting the EP (epoxy resin) adhesive distribution in the “steel-lead” structure and can detect A 4 layer “steel - lead ” bonding structure of a debonding defect, is a more ideal detection method.