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ZHANG Ying, WANG Zi-xing, ZHOU Jun-peng, LIU Ai-ling. EXPERIMENTAL STUDY ON ACOUSTIC EMISSION QUANTITATIVE ASSESSMENT OF Q345 SPECIMEN’S MESOMECHANICAL DAMAGE[J]. Engineering Mechanics, 2014, 31(4): 40-45,60. DOI: 10.6052/j.issn.1000-4750.2012.11.0866
Citation: ZHANG Ying, WANG Zi-xing, ZHOU Jun-peng, LIU Ai-ling. EXPERIMENTAL STUDY ON ACOUSTIC EMISSION QUANTITATIVE ASSESSMENT OF Q345 SPECIMEN’S MESOMECHANICAL DAMAGE[J]. Engineering Mechanics, 2014, 31(4): 40-45,60. DOI: 10.6052/j.issn.1000-4750.2012.11.0866
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EXPERIMENTAL STUDY ON ACOUSTIC EMISSION QUANTITATIVE ASSESSMENT OF Q345 SPECIMEN’S MESOMECHANICAL DAMAGE

  • College of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, China

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  • Received Date: November 14, 2012
  • Revised Date: January 21, 2013
    Graphical Abstract
    • Abstract
  • Based on the mesomechanical damage theory and micro-void damage mechanism, a void growth ratio VG was selected as the damage variable so as to establish an acoustic emission (AE) quantitative evaluation model. Carrying out tensile experiment on Q345 notched bar specimen obtained the AE information from a yield to fracture process. The meso-damage parameters distribution of a tensile specimen was simulated with the Gurson-Tvergaard- Needleman model, and their numerical solutions were achieved. Based on AE testing and Finite Element Simulation, the quantitative evaluation formula for Q345 between the void growth ratio VG and AE cumulative hits N was advanced. The result shows that, in the tensile process of Q345 steel from yield to fracture damage, the function relationship of N and VG can be divided into two stages, namely a linear damage stage and a nonlinear damage stage, and that when the N reaches 128, the material is at the transition state from a linear damage stage to a nonlinear damage stage.
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    • References (19)
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