Experimental Research of the Acoustic Emission (AE) Characteristics during the Tensile Process of the Blowout Preventer Shell Material

2012 ◽  
Vol 524-527 ◽  
pp. 1395-1398 ◽  
Author(s):  
Jun Ru Zhao ◽  
Guan Ga Dai ◽  
Ying Zhang
Keyword(s):  
Acoustic Emission ◽  
Rupture Process ◽  
Parameter Analysis ◽  
Waveform Analysis ◽  
Emission Characteristics ◽  
Shell Material ◽  
Acoustic Emission Technique ◽  
Tensile Process ◽  
Blowout Preventer ◽  
Damage Process

In this paper, The tesile damage process of the blowout preventor shell material ZG25GrNiMo was researched using acoustic emission technique. Analyzed the acoustic emission characteristics in different damage phases of this material using parameter analysis and waveform analysis. The result indicated that the acoustic emission characteristics are different in yielding, plastic deformation and rupture process. The differences of frequency spectrums of different damage modes are evident.

Acoustic Emission Signals Characteristics of Q345R at Tensile Progress in the Normal and Low Temperatures

2013 ◽  
Vol 690-693 ◽  
pp. 1972-1975
Author(s):  
Fei Fei Long ◽  
Qiong Wang ◽  
Yang Song ◽  
Wei Li
Keyword(s):  
Acoustic Emission ◽  
Correlation Analysis ◽  
Low Temperatures ◽  
Single Parameter ◽  
Parameter Analysis ◽  
Emission Characteristics ◽  
Distribution Analysis ◽  
Tensile Process

Acoustic emission signals were collected during the tensile process of Q345R at the normal and low temperatures. The signals were analyzed by the single parameter analysis, distribution analysis and correlation analysis to result the acoustic emission characteristics of Q345R in the normal and low temperatures.

Based on Micromechanical Damage of Experimental Study on 20 Steel Notched Specimen's Acoustic Emission Characteristics

2013 ◽  
Vol 712-715 ◽  
pp. 1084-1089
Author(s):  
Ying Zhang ◽  
Zi Xing Wang ◽  
Ai Ling Liu ◽  
Han Gao
Keyword(s):  
Acoustic Emission ◽  
Quantitative Evaluation ◽  
Evaluation Model ◽  
Damage Model ◽  
Growth Ratio ◽  
Tensile Process ◽  
Micromechanical Damage ◽  
Damage Process ◽  
Fracture Damage ◽  
Steel 20

Based on the Gurson-Tvergaard-Needleman micromechanical damage model, taking void growth ratioVGas the damage variable established acoustic emission (AE) quantitative evaluation model. Taking steel 20 notched bar specimens tensile process as example, get AE information from yield to fracture process. Using ABAQUS analyzed the meso-damage process during tensile process of the specimens, and get the numerical solution of meso-damage parameters. Based on AE testing and the results of Finite Element Simulation, established the quantitative evaluation formula ofVGand AE cumulative hitsNduring 20 steel notched specimens tensile process. Result shows that, 20 steel from yield to fracture damage, the relationship betweenNandVGis divided into two stage, namely linear damage stage and nonlinear damage stage. When theNreaches 61, the material is at the transition stage from linear damage stage to nonlinear damage stage.

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