Single-step scanner-based digital image correlation (SB-DIC) method for large deformation mapping in rubber |
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| Institution: | 1. School of Mechanical Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia;2. School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia;1. State Key Laboratory of Information Photonics & Optical Communications, Beijing University of Posts & Telecom, Beijing 100876, China;2. ZTE Corporation, China;1. School of Electronic Information Engineering, Tianjin University, Tianjin, 300072 PR China;2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024 PR China;1. Institute of Modern Optics, Department of Physics, Harbin Institute of Technology, Harbin, 150001, China;2. Key Laboratory of Micro-Optics and Photonics Technology of Heilongjiang Province, Harbin, 150001, China;1. CEA, DEN, DTEC, SGCS, F-30207 Bagnols-sur-Cèze, France;2. CEA, DEN, DTEC, SEPE, F-30207 Bagnols-sur-Cèze, France;3. Aix-Marseille Université, CNRS, IUSTI, UMR 7343, 13453 Marseille Cedex 13, France;1. State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084 China;2. Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing, 100048 China;3. School of Mechanical Engineering, Purdue University, West Lafayette, IN, 47907 USA;4. Ingram School of Engineering, Texas State University, San Marcos, TX, 78746 USA |
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| Abstract: | The incremental digital image correlation (DIC) method has been applied in the past to determine strain in large deformation materials like rubber. This method is, however, prone to cumulative errors since the total displacement is determined by combining the displacements in numerous stages of the deformation. In this work, a method of mapping large strains in rubber using DIC in a single-step without the need for a series of deformation images is proposed. The reference subsets were deformed using deformation factors obtained from the fitted mean stress-axial stretch ratio curve obtained experimentally and the theoretical Poisson function. The deformed reference subsets were then correlated with the deformed image after loading. The recently developed scanner-based digital image correlation (SB-DIC) method was applied on dumbbell rubber specimens to obtain the in-plane displacement fields up to 350% axial strain. Comparison of the mean axial strains determined from the single-step SB-DIC method with those from the incremental SB-DIC method showed an average difference of 4.7%. Two rectangular rubber specimens containing circular and square holes were deformed and analysed using the proposed method. The resultant strain maps from the single-step SB-DIC method were compared with the results of finite element modeling (FEM). The comparison shows that the proposed single-step SB-DIC method can be used to map the strain distribution accurately in large deformation materials like rubber at much shorter time compared to the incremental DIC method. |
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| Keywords: | Single-step digital image correlation Incremental digital image correlation Natural rubber |
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