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Advances in Civil Engineering
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2021
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Article
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Fig 4
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Research Article
Experimental Study on the Caustics of Moving Cracks and Elliptical Curvature under Impact Loading
Figure 4
Three-point curved focus speckle schematic. (a) L1. (b) L2. (c) L3. (d) L4. (e) L5. (f) L6.