Transactions of Materials and Heat Treatment

Title：3D digital speckle analysis system for dynamic strain measurement in sheet deformation

Authors： ZHNAG De-hai LIANG Jin TANG Zheng-zong ZHANG Xiao-qiang GUO Cheng

Unit： Xi'an Jiaotong University

KeyWords： sheet deformation digital speckle correlation method strain measurement stress

ClassificationCode：TP391；TG806

year,vol(issue):pagenumber：2010,35(4):27-31

Abstract：

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.

Funds：

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）

Reference：

［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.

Service：

【This site has not yet opened Download Service】【Add Favorite】