一种短裂纹群CT仿真投影获取新方法  

A Novel Acquisition Technique of Simulated CT Projections of Short Collective Cracks

作　　者：徐夏刚[1] 张定华[1] 赵歆波[1] 敖波[1] 

机构地区：[1]西北工业大学现代设计与集成制造教育部重点实验室,西安710072

出　　处：《中国机械工程》2007年第10期1211-1213,共3页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50375126)

摘　　要：短裂纹尺寸一般在几微米到几十微米之间,低于目前工业CT的最小分辨率,无法被检测出来。基于CT仿真系统,利用结构实体几何模型,提出了一种短裂纹的模拟方法:为适合CT仿真系统的扫描精度,先模拟比实际尺寸大的短裂纹群,获取该短裂纹群的CT投影数据,然后把该图像数据利用像素合并的方法缩小到实际尺寸,间接得到实际尺寸的短裂纹群CT仿真投影图像。利用该短裂纹模拟和间接CT投影结果可进一步研究CT重建和疲劳寿命分析等。试验证明,该方法能得到较为真实的短裂纹群CT投影数据。Short cracks cannot be inspected directly by latest industrial computed tomography（ICT）, for their dimensional steps from several to several tens μm,whose is smaller than the finest ICT＇s resolution. One approach to simulate short cracks was designed using constructive solid geometry（CSG） model based on CT simulator system. Those short cracks whose scale was several times bigger than actual ones were simulated and their CT projections were acquired to meet the projection precision. Then pixel combination technique was proposed to scale down these projections to actual size. As a result, simulation projections of short collective cracks were acquired indirectly. Based on the research of the ICT reconstruction and fatigue life in the next step could be continued. Experiments prove that CT projections of short collective cracks which show much closer to the real ones can be achieved.

关 键 词：短裂纹模拟 工业CT 仿真投影 像素合并 

分 类 号：TP911.73[自动化与计算机技术]