Acoustic emission study of fatigue crack propagation in Q345R
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摘要: 為了建立疲勞過程與聲發射參數之間的關系,對壓力容器常用鋼材的典型代表——Q345R的疲勞裂紋擴展過程的聲發射信號進行詳細研究.結果表明:Q345R疲勞裂紋擴展的聲發射過程分為三個明顯的階段,累積計數值和累積能量值可以很好地表征整個疲勞裂紋擴展過程;聲發射參數在第2階段到第3階段的轉折點比線彈性斷裂力學定義下的要提前,表明聲發射技術對疲勞進入失穩擴展階段更加敏感;建立了Q345R聲發射計數率和能量率與疲勞裂紋擴展速率的關系,它可以為Q345R剩余壽命的預測提供依據.Abstract: The acoustic emission signals of fatigue crack propagation in Q345R,which is the typical representative of common steel for pressure vessels,were investigated in detail to construct a relationship between fatigue and acoustic emission. The results show that there are three distinct stages of acoustic emission during fatigue crack propagation in Q345R. Cumulative count and cumulative energy can characterize the whole fatigue crack propagation well. The transition from the 2nd stage to the 3rd stage of acoustic emission advances that of linear elastic fracture mechanics,indicating that acoustic emission is more sensitive to the unstable fracture stage of fatigue crack propagation. The relations of count rate and energy rate to fatigue crack propagation rate of Q345R are established respectively for predicting the remaining life of Q345R.
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Key words:
- low alloyed steel /
- fatigue crack propagation /
- acoustic emission /
- pressure vessels /
- monitoring
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