CAJ | 학술논문

作为一种简单有效的非接触、全场光学测试方法,二维数字图像相关法(2D-DIC)已在不同领域广泛用于平面物体表面的面内位移和应变测量.为避免实际成像系统固有的(如镜头畸变)以及测量过程中不可避免出现的各种不利因素(如物面离面位移、相机自热)带来的变形测量误差,建立了使用高质量双远心镜头的高精度2D-DIC 测量系统.为验证该系统的应变测量精度,对铝合金进行了弹性小变形范围内拉伸实验,并用所建立的2D-DIC 测量系统和使用直角应变花的电测法同时测量每级载荷下的横向和纵向应变.实验结果显示建立的2D-DIC 测量系统与修正横向效应后的应变电测结果的平均绝对偏差小于10με,由2D-DIC 测得的弹性模量和泊松比也与应变片测量结果吻合良好.实验结果表明建立的高精度2D-DIC 测量系统可用于工程中材料或结构表面面内小应变的准确测量.
작위일충간단유효적비접촉、전장광학측시방법,이유수자도상상관법(2D-DIC)이재불동영역엄범용우평면물체표면적면내위이화응변측량.위피면실제성상계통고유적(여경두기변)이급측량과정중불가피면출현적각충불리인소(여물면리면위이、상궤자열)대래적변형측량오차,건립료사용고질량쌍원심경두적고정도2D-DIC 측량계통.위험증해계통적응변측량정도,대려합금진행료탄성소변형범위내랍신실험,병용소건립적2D-DIC 측량계통화사용직각응변화적전측법동시측량매급재하하적횡향화종향응변.실험결과현시건립적2D-DIC 측량계통여수정횡향효응후적응변전측결과적평균절대편차소우10με,유2D-DIC 측득적탄성모량화박송비야여응변편측량결과문합량호.실험결과표명건립적고정도2D-DIC 측량계통가용우공정중재료혹결구표면면내소응변적준학측량.
@@@@As a simple yet effective optical technique, two-dimensional digital image correlation (2D-DIC) has been widely used in various fields for in-plane displacement and strain measurement of planar objects. In this paper, a high-accuracy 2D-DIC system using a high-quality telecentric lens is established to avoid the measurement errors associated with lens distortion, out-of-plane motion of test objects and self-heating of a camera. To verify the accuracy of the strain measured by the established 2D-DIC system, uniaxial tensile tests of an aluminum specimen were performed. The axial and transversal strains measured by the proposed 2D-DIC system were carefully compared with those measured by strain gage rosettes. The perfect agreement between the two measurements further verifies the strain measurement accuracy of the established 2D-DIC system.