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Application of Digital Image Correlation (DIC) in Dynamic Notched Semi-Circular Bend (NSCB) Tests

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Abstract

Notched semi-circular bend (NSCB) specimen has been successfully used in fracture tests of brittle materials. As a suggested method for measuring the dynamic fracture toughness of rocks by the International Society for Rock Mechanics (ISRM), this method only measures the fracture initiation toughness of the sample with given external load and geometrical parameters. Using the digital image correlation (DIC) method combined with ultra-high speed photography, the objective of this paper is to measure more fracture parameters of the NSCB specimen loaded by a split Hopkinson pressure bar (SHPB) system. The displacement and strain fields during the fracture propagation process were determined using DIC method. The location of the crack tip, the fracture initiation toughness and the fracture propagation toughness were subsequently calculated using the deformation fields. Compared with the traditional NSCB tests, the optical method of DIC provides much more information on the fracture propagation process.

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Acknowledgments

This work was supported by the National Basic Research Program of China under Grant # 2010CB731503 and Grant # 2013CB035904. K. Xia’s research was partially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Discovery Grant # 72031326. G. Gao was financially supported by the China Scholarship Council (No. 201206010226) during her visit at the University of Toronto.

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Authors and Affiliations

  1. LTCS and College of Engineering, Peking University, Beijing, 100871, China

    G. Gao & Z. Li

  2. Department of Civil Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 1A4

    G. Gao, S. Huang & K. Xia

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  1. G. Gao
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  2. S. Huang
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  3. K. Xia
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Correspondence to K. Xia.

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Gao, G., Huang, S., Xia, K. et al. Application of Digital Image Correlation (DIC) in Dynamic Notched Semi-Circular Bend (NSCB) Tests. Exp Mech 55, 95–104 (2015). https://doi.org/10.1007/s11340-014-9863-5

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  • DOI: https://doi.org/10.1007/s11340-014-9863-5

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