Based on Micromechanical Damage of Q345 Specimens Acoustic Emission Quantitative Assessment in Tensile Process
To further reveal the mesomechanical damage behavior of the plastic material, quantitative evaluation the micromechanical damage state of material use acoustic emission characteristic parameters. Based on the Gurson-Tvergaard-Needleman micromechanical damage model, establish the quantitative evaluation model of acoustic emission cumulative hits, taking void growth ratio as the damage variable. Taking steel Q345 notched bar specimens tensile process as example, using acoustic emission testing technology, get the AE information from yield to fracture process. Using ABAQUS finite element analysis software, analyze the meso-damage process during tensile process of steel Q345 notched bar specimens, and get the numerical solution of meso-damage parameters. Based on AE testing and Finite Element Simulation, get the quantitative evaluation formula of void growth ratio based on AE cumulative hits N during Q345 steel notched bar specimens tensile process. Result shows that, in the tensile process of Q345 steel from yield to fracture damage, the function relationship of N and VG is divided into two stage, linear damage stage and nonlinear damage stage, and when the N reaches 128, the material is at the transition state from linear damage stage to nonlinear damage stage. This critical transition area value could be used as steel Q345 damage fracture of acoustic emission recognition feature and safety evaluation threshold value.
Acoustic emission Void growth ratio Cumulative hits Gurson-Tvergaard-Needleman model steel Q345
ZHANG Ying WANG Zi-xing ZHOU Jun-peng LIU Ai-ling
Department of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,China
国际会议
北京
英文
1-9
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）