Optical extensometer and elimination of the effect of out-of-plane motions |
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| Institution: | 1. Department of Engineering Mechanics, College of Civil Engineering, Southeast University, Nanjing 210018, People?s Republic of China;2. College of Mechanics and Materials, Hohai University, Nanjing 210098, China;1. Département de physique, Université de Moncton, Canada E1A 3E9;2. Department of Solid State Physics, Science University, Ho Chi Minh City, Viet Nam;1. Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Arak, Iran;2. Department of Mechanical Engineering, Razi University, Kermanshah, Iran;3. Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON, Canada;4. Department of Mechanical Engineering, University of Tehran, Tehran, Iran;1. Department of Mechanical Engineering PES University, Bangalore-560085, Karnataka, India;2. Department of Mechanical Engineering Indian Institute of Technology, Bombay-400076 Mumbai, India |
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| Abstract: | A novel optical extensometer is developed to estimate the local uniform strain on planar surface accurately. The proposed system consists of a shared large format lens and two image sensors, which acquire pairs of images of two isolated small regions on the object surface simultaneously. Digital image correlation (DIC) algorithm is applied to determine the relative displacement between gauge points designated on recorded pairs of images. Then local strain can be extracted after dividing the relative displacement by the scale distance. Moreover, a special experimental setup called “correction sheet” is used to eliminate the virtual strain induced by out-of-plane motions. Uni-axial tensile experiments are performed to validate the reliability and resolution of the optical extensometer, and the measurement results demonstrate that the resolution of the optical extensometer achieves 2–3 με. |
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| Keywords: | Optical extensometer Out-of-plane motions Strain measurement Correction sheet Digital image correlation |
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