锻压技术

板料变形三维数字散斑应变测量分析系统研究

英文标题：3D digital speckle analysis system for dynamic strain measurement in sheet deformation

作者：张德海梁晋唐正宗张晓强郭成

分类号：TP391；TG806

出版年,卷(期):页码：2010,35(4):27-31

摘要：

针对板料变形中应变检测的常规方法和传统方法存在的不足，通过数字散斑相关方法、计算机双目视觉理论和材料力学理论分析了试件表面变形前后的散斑图像，来动态跟踪试件表面上几何点的运动并得到三维位移场，在此基础上计算得到试件的三维应变场。基于此原理开发了XJTUDIC三维数字散斑动态应变测量分析系统。应用带孔铝质制件进行了单向拉伸实验。测量结果表明，该系统能较好的反映板料变形过程中的三维应变状态，较好的测量试件表面的三维轮廓，直观再现工件表面的变形场、应变场和成形极限图（FLD），对于需要测量的关键点可以实现重点跟踪，动态测量出该点在任意时刻任意位移的应变。该系统可以应用到不同的力学测量现场。

To avoid the shortcomings of traditional strain detection in sheet deformation, digital speckle correlation method, computer binocular vision theory and mechanics theory of materials were introduced to trace the motion of specimen surface geometric points dynamically by analyzing the speckle images of the sample surfaces before and after deformation. According to the motion of geometric points on the foundations of getting the 3D displacement field, the 3D strain field could be calculated. Based on this principle, the 3D digital speckle analysis system for dynamic strain measurement (XJTUDIC) was developed. Perforated aluminum workpiece was used for uniaxial tension test. It is found that the system can reflect the 3D strain state well in sheet deformation, reconstruct the 3D profile of the specimen surfaces vividly and reproduce the deformation field, the strain field and the forming limit diagram of the workpiece surfaces intuitively. For critical points, the system can also track their trajectory and calculate their strain at any time and arbitrary displacement. Furthermore the system can be utilized to various mechanical sites.

基金项目：

国家自然科学基金资助项目（50975219）；江苏省科技支撑计划工业部分（BE2008058）

参考文献：

［1］张德海，梁晋，郭成.板料成形回弹三维光学测量技术研究[J]. 西安交通大学学报，2009，43（9）51-55.
［2］许树勤，陈昊哲，姚敏敏.锻比、相对变形量与对数应变[J].锻压技术, 2009，34（1）：14-15.
［3］武立波，宋若冰，张文孝，等. 基于应变路径的拼焊板盒形件成形性能研究[J].锻压技术，2009，34（1）：36-38.
［4］Peters W H, Ranson M A, Sutton M A, et al. Application of digital correlation methods to rigid body mechanics [J]. Opt. Eng., 1983, 22(6):738-742.
［5］He Z H, Sutton M A, Ranson W F, et al. Two\|dimensional fluid\|velocity measurements by use of digital\|speckle correlation technique[J]. Exp.Mech., 1984, 24(2): 117-121.
［6］Vendroux G, Knauss W G.Submicron deformation field measurement,Part 2:Improved digital image correlation[J]. Exp. Mech., 1998, 38(2):8691.
［7］Borgefors G, Ramella G, Baja G S. Shape and topology preserving multi\|valued image pyramids for multi\|resolution skeletonization[J]. Pattern Recognition Letters, 2001, 22(67): 741-751.
［8］Yoneyama S, Morimoto Y. Accurate displacement measurement by correlation of colored random patterns[J]. JSME Int.J.A\|Solid M., 2003,46(2):178-184.
［9］孟利波，金观昌，姚学峰，等. 数字散斑相关方法及其在碳纤维复合材料压力容器变形测量中的应用[J].光学技术, 2006, 32(2):163-170.
［10］张景超，丁喜峰. 激光散斑照相法测量不同金属材料焊接部位的热位移[J].激光杂志,2000,21(5):38-39.
［11］谭忆秋，张晓宁，孙立军. 应用数字散斑处理技术研究沥青拉伸应变速率[J]. 建筑材料学报,2003,16(2):321-324.
［12］郭香华，方贷宁，李喜德.用电子散斑法对纯镍薄片弯曲变形的测量[J].力学实践,2005, 27(2): 21-25.
［13］蒋立辉，王春晖，王骐，等. 脉冲相干激光雷达的散斑成像模型及其散斑噪声压缩[J].光学学报，2000，20（12）：1623-1628.
［14］李大成, 梁晋，肖振中，等. 汽车模具泡沫实型的三维光学快速检测研究[J].锻压技术，2009，34（3）：124-127.

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