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Improved imaging of fatigue crack profile in thick cruciform samples using ultrasonic phased array models
Published in
2010
Volume: 132
   
Issue: 1
Pages: 0115011 - 0115018
Abstract
The determination of depth profile of vertical fatigue cracks generated in thick cruciform samples using an ultrasonic phased array is investigated in this paper. The cracks were formed by conducting fatigue fracture test on two mild steel cruciform specimens of 135 mm thickness: one under room temperature and the other under subzero temperature (-70°C). A semi-elliptical surface starter notch of 2 mm width and more than 400 mm length was initially created in the specimens. Alternating current potential drop technique and phased array ultrasonic technique were attempted in order to determine the depth profiles of the starter notch as well as that of the crack. Virtual experiments carried out with a finite-difference time domain based numerical model were found to be advantageous in reducing actual experimental trials, facilitate an understanding of the echo signatures, and help assess the crack depth. The profiles of the crack and the notch were verified through destructive assay of the samples and subsequent dye penetrant assisted physical measurements. Copyright © 2009 by ASME.
About the journal
JournalJournal of Pressure Vessel Technology, Transactions of the ASME
ISSN00949930
Open AccessNo
Concepts (30)
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    ALTERNATING CURRENT POTENTIAL DROP
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    CRACK DEPTHS
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    CRUCIFORM COMPONENT
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    DEPTH PROFILE
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    DYE PENETRANTS
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    ELLIPTICAL SURFACES
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    FATIGUE CRACKS
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    FATIGUE FRACTURE
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    FINITE DIFFERENCE TIME DOMAINS
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    Mild steel
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    Numerical models
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    PHASED ARRAY ULTRASOUND
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    PHASED ARRAYS
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    PHYSICAL MEASUREMENT
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    Room temperature
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    Sub-zero temperatures
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    ULTRASONIC PHASED ARRAY
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    ULTRASONIC TECHNIQUES
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    VIRTUAL EXPERIMENTS
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    Carbon steel
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    Fatigue crack propagation
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    Fatigue of materials
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    Finite difference time domain method
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    Fracture
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    Fracture testing
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    STARTERS
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    Ultrasonic testing
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    Ultrasonic transducers
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    Ultrasonics
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    Cracks