Abstract
Direct digital moiré method of circular and radial gratings with its phase shifting technique is proposed and applied in a mixed-mode fracture problem of large deformation materials. Circular and radial curves are used as both reference and specimen gratings in this digital moiré method for deformation measurement. And phase shifting technique is automatically implemented directly on circular and radial fringes, which facilitates obtaining displacement fields in polar coordinate system, radial u r and circumferential u θ , and strain fields ε r, ε θ , ε rθ are calculated subsequently. Application of the direct digital moiré method of circular and radial gratings in a mixed-mode fracture problem with large deformation illustrates the process of this method, and also demonstrates its feasibility and validity for large deformation materials.
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Acknowledgements
The authors would like to acknowledge the support from the National Science Foundation of China (No: 10732080) and National Basic Research Program of China (No: 2007CB714000).
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Xiao, X., Kang, Y., Hou, Z. et al. Displacement and Strain Measurement by Circular and Radial Gratings Moiré Method. Exp Mech 50, 239–244 (2010). https://doi.org/10.1007/s11340-009-9248-3
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DOI: https://doi.org/10.1007/s11340-009-9248-3