The micro-connection of the second-order moiré fringes and its order determination,and the determination of the boundary strains |
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Authors: | Cuichang Fang Xiaolin Jiang |
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Institution: | (1) Department of Engineering Mechanics, Tsinghua University, Beijing, China |
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Abstract: | The micro-connection method for determining the centre lines of second-order moiré fringes presented in this paper can enhance
the accuracy in measuring strain fields, and generally can determine the absolute order of the second-order moiré fringes.
The strain data obtained from curved beam experiment are in good accordance with theory. The relationship between the second-order
moiré fringe and the strains at the specific points of the specimen is derived. Hence a reciprocate shift method is presented
for determining strain distributions in the non-overlapping region of the shifted moiré patterns, (usually in the region of
specimen where no second-order moiré fringes occur is the boundary region). |
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Keywords: | second-order moiré fringe micro-connection shift of moiré patterns |
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