光学引伸计在低维材料实时应变测量中的应用

随着低维材料的广泛应用,有关低维材料力学性能的研究成为当前热点之一。在低维材料实时应变测量中,大标距试件表面上的跟踪目标移出图像跟踪范围,会导致跟踪目标的丢失,影响材料的实时应变测量。利用基于数字图像跟踪技术的光学引伸计将大标距转换成小标距,不仅可以在应变测量时保持跟踪目标在视场范围内移动,实现实时跟踪,而且可以动态了解低维材料应变变化规律。利用微力学万能试验机和光学引伸计同时进行低维材料的应变测量,实验结果表明,二者规律基本吻合且后者利用双线性插值可以将目标定位在0.01 pixel上,说明光学引伸计完全可以应用于低维材料的实时应变测量中,并为探讨低维材料动态力学性能提供了一种新的实验方法。

Abstract

The study of mechanical property about low-dimensional materials with its wide application has been one of the hot-spots. In the real-strain measurement of low-dimensional materials,the tracking target on the surface of large distance specimen would move out the scope of image tracking. In this way,the tracking target might be lost,which affects the real-strain measurement. So the optical extensometer based on digital image tracking technology is proposed to change the large distance to small one. Then,the tracking objective is adjusted to move in the screen field of view. The method of real tracking can be realized. Moreover,the strain regulation of low-dimensional materials might be dynamically learned. The strain measurement is carried out using micro-mechanics universal testing machine and optical extensometer together. From the experiment,the results obtained by the optical extensometer are agreed with ones obtained by the micro-mechanics universal testing machine. And,the objective is orientated in the 0.01 pixel location using the arithmetic of bilinear inter value. So,the optical extensometer can be applied on the real-strain measurement of low-dimensional materials. Also,a new experimental method is offered for studying the dynamic mechanics of low-dimensional materials.

参考文献

[1] . Hua,H. M. Xie,B. Pan et al.. A new micro-tensile system for measuring the mechanical properties of low-dimensional materials-fibers and films[J]. Polym. Test., 2007, 26(4): 513-518.

[2] . Pan,H. M. Xie,Z. Q. Guo et al.. Full-field strain measurement using a two-dimensional Savitzky-Golay digital differentiator in digital image correlation[J]. Opt. Eng., 2007, 46(3): 033601.

[3] . 用数字相关测量方法研究纸浆模塑材料拉伸时的力学性能[J]. 包装工程, 2004, 25(4): 168-170.

. . Investigation of the mechanical properties of molded pulp with DICM[J]. Packaging Engineering, 2004, 25(4): 168-170.

[4] . 单纤维细丝微力学性能实验研究[J]. 实验力学, 2005, 20(1): 72-76.

. . Micromechanical tensile characterization of single fiber[J]. J. Experiment Mechanics, 2005, 20(1): 72-76.

[5] 华晋,赵志敏,王开圣. 基于数字图像处理的光纤直径测量方法[J]. 光学学报,2009,29(s1):220-222

Hua Jin,Zhao Zhimin,Wang Kaisheng. Measurement of fiber diameter based on digital image processing[J]. Acta Optica Sinica,2009,29(s1):220-222

[6] . 数字图像相关方法在土木测试领域中的实验研究[J]. 南京航空航天大学学报, 2009, 41(2): 71-75.

. Experimental studies on application of digital image correlation in measuring field of civil engineering[J]. J. Nanjing University of Aeronautics & Astronautics, 2009, 41(2): 71-75.

[7] . 数字图像分析用于下颌后磨牙及其桩核修复体[J]. 应用科学学报, 2006, 24(6): 637-641.

. . Digital image analysis applied to a mandibular molar and its post-core prosthesis[J]. J. applied sciences, 2006, 24(6): 637-641.

[8] 孙伟,何小元,C. Quan 等. 基于数字图像相关的三维刚体位移测量方法[J]. 光学学报,2008,28(5):894-901

Sun Wei,He Xiaoyuan,Quan Chenggen et al.. Three-dimensional rigid body displacement measurement based on digital image correlation[J]. Acta Optica Sinica,2008,28(5):894-901

[9] 杨勇,王琰蕾,李明等.高精度数字图像相关测量系统及其技术研究[J]. 光学学报,2006,26(2):197-201

Yang Yong,Wang Yanlei,Li Ming et al.. Research of high-accuracy digital image correlation measurement system[J]. Acta Optica Sinica,2006,26(2):197-201

[10] 潘兵,谢惠民,夏勇等. 数字图像相关中基于可靠变形初值估计的大变形测量[J]. 光学学报,2009,29(2):400-406

Pan Bing,Xie Huimin,Xia Yong et al.. Large-deformation measurement based on reliable initial guess in digital image correlation method[J]. Acta Optica Sinica,2009,29(2):400-406

[11] 陈燏,张新荣,朱轶伟等.多层次分割实现微小尺寸实时测量[J]. 光电工程,2005,32(2):64-66

Chen Yu,Zhang Xinrong,Zhu Yiwei et al.. Micro-dimension detection by means of multi-level segmentation[J]. Opto-Electronic Engineering,2005,32(2):64-66

[12] . Zhou,K. E. Goodson. Subpixel displacement and deformation gradient measurement using digital image speckle correlation (DISC)[J]. Opt. Eng., 2001, 40(8): 1613-1620.

Pan Bin,Xie Huimin. Full-field strain measurement based on least-square fitting of local displacement for digital image correlation method[J]. Acta Optica Sinica,2007,27(11):1980-1986

[14] . Montera Dennis,K. Steven. Object tracking through adaptive correlation[J]. Opt. Eng., 1994, 33(1): 294-301.

[15] . S. Jang,H. I. Choi. Active models for tracking moving objects[J]. Pattern Recognition, 2000, 33(7): 1135-1146.

[16] . . A new mark shearing technique for strain measurement using digital image correlation method[J]. Rev. Sci. Instrum., 2008, 79(10): 105101.

王伟, 何小元. 光学引伸计在低维材料实时应变测量中的应用[J]. 光学学报, 2010, 30(6): 1662. Wang Wei, He Xiaoyuan. Application of Optical Extensometer on the Real-Strain Measurement of Low-Dimensional Materials[J]. Acta Optica Sinica, 2010, 30(6): 1662.

光学引伸计在低维材料实时应变测量中的应用

关于本站 Cookie 的使用提示

全站搜索

光学引伸计在低维材料实时应变测量中的应用

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索