Experimental study on the fiber pull-out of composites using digital gradient sensing technique |
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| Institution: | 1. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing Institute of Aeronautical Materials, Beijing, 100095, China;2. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin, 150090, China;3. Department of Engineering Mechanics, Applied Mechanics Lab, Tsinghua University, Beijing, 100084, China;1. Fatigue and Fracture Research Laboratory, Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering, Iran University of Science and Technology, Narmak, 16846 Tehran, Iran;2. Fracture Research Laboratory, Faculty of New Sciences & Technologies, University of Tehran, P.O. Box 14395-1561, Tehran, Iran;1. Institute for Infocomm Research (I2R), 138632, Singapore;2. Department of electrical and computer engineering, National University of Singapore, 117576, Singapore;1. School of Mechanics & Civil Engineering, China University of Mining &Technology, Beijing 100083, PR China;2. Beijing Institute of Electronic System Engineering, Beijing 100039, PR China |
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| Abstract: | A method to measure the stress field at the fiber tip in the fiber pull out test was proposed by using a digital gradient sensing technique. First, the principle of digital gradient sensing is introduced, and the non-contact optical system of digital gradient sensing developed. Then, a fiber reinforced composite model specimen, where a nail was inserted in epoxy resin to act as a fiber, was performed, and a pull out test was conducted on the specimen using the digital gradient sensing technique. Finally, the angular deflections contour at the fiber tip was obtained, and the stress intensity factor was extracted from the angular deflections. The results show that the stress intensity factor at the fiber tip extracted from the angular deflections agreed with the results calculated by the finite element method. |
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| Keywords: | Fiber reinforced composites Digital gradient sensing Pull out Angular deflection Stress intensity factor |
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