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Smart Structures and Systems
  Volume 10, Number 6, December 2012, pages 547-555

Measuring high speed crack propagation in concrete fracture test using mechanoluminescent material
Wha-Jung Kim, Jae-Min Lee, Ji-Sik Kim and Chang Joon Lee

    Measuring crack length in concrete fracture test is not a trivial problem due to high speed crack propagation. In this study, mechanoluminascent (ML) material, which emits visible light under stress condition, was employed to visualize crack propagation during concrete fracture test. Three-point bending test was conducted with a notched concrete beam specimen. The cracking images due to ML phenomenon were recorded by using a high speed camera as a function of time and external loadings. The experimental results successfully demonstrated the capability of ML material as a promising visualization tool for concrete crack propagation. In addition, an interesting cracking behavior of concrete bending fracture was observed in which the crack propagated fast while the load decreased slowly at early fracture stage.
Key Words
    mechanoluminescence; concrete fracture; high speed crack detection; cracking images; threepoint bending test
Wha-Jung Kim, Jae-Min Lee and Chang Joon Lee : School of Architecture and Civil Engineering, Kyungpook National University, Daegu, South Korea
Ji-Sik Kim : Department of Advanced Materials Engineering, Kyungpook National University, Sangju, South Korea

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