摘要
采用热波无损检测方法,对某型导弹发动机壳状钢壳体/绝热层试件的脱粘缺陷进行实验研究。针对实验获取的热图存在"非均匀性、噪音大、缺陷显示对比度低"等问题,基于自适应滤波和分水岭方法对热图进行增强和分割处理,实现了缺陷位置、大小及深度的定量评估。结果表明:热波技术能快速地发现缺陷(几秒钟);对缺陷的定位比较准确,检测结果直观;特别适用于复杂壳状结构的检测,很容易检测出深度4mm、直径15mm的脱粘缺陷,能够满足固体火箭发动机壳体粘接结构的检测需求;并且脱粘面积越大越容易检测,对缺陷直径、深度等参数的估算误差也越小。
Based on thermal wave nondestructive technique,the small curvature adhesion structure with debond defects between steel shell and rubber insulation layer was investigated.For the problem of non-uniformity,high noise and low display contrast of the infrared images obtained by the infrared thermal camera,self-adaptive filtering and watershed segmentation algorithms were used to enhance the image quality and segment the defect from the background.Finally,the defect location,size and depth were estimated quantitatively.The results show that thermal wave technique has a high inspection speed（several seconds）,locates defect exactly and has intuitionistic inspection results.It is also very applicable to small curvature adhesion structure.Debond with diameter of 15mm at the depth of 4mm is easy to be detected,which could satisfy the inspection requirement for solid rocket motor（SRM）.The bigger of the debond area,the easier to be detected and also the less of the error for estimating defect size.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2010年第12期39-43,共5页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(面上项目51075390)
关键词
小曲率粘接结构
脱粘
热波检测
缺陷识别
small curvature adhesive structure
debond
thermal wave inspection
defect identification
