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Acoustic emission and stress-corrosion cracking of U-4 1/2 wt%Nb

Paper shows the correlation between stress-corrosion crack-velocity measurements and the acoustic-emission behavior of a high-strength alloy

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Abstract

Stress-corrosion crack propagation in U-4 1/2 wt%Nb has been monitored with crack-opening displacement and acoustic-emission techniques. Excellent correlation was obtained between the direct crack-velocity measurements and the emission count rate at all stress intensities. The data also show that, as the cracking velocity increases, the counts per unit area of new crack surface increase. The results of the investigation show the feasibility of acousticemission detection techniques as a useful stress-corrosion testing tool.

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Abbreviations

b :

specimen thickness

b n :

specimen thickness at root of side grooves

E :

modulus of elasticity

K :

stress intensity

K IC :

plane-strain fracture toughness

K ISCC :

plane-strain stress-corrosion-cracking threshold

P :

load

W :

specimen length from the load line

da/dt :

crack velocity

dN/dt :

emission rate

dN/dA :

emissions per unit area of crack growth

References

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Authors and Affiliations

  1. Physical Metallurgy Division 5531, Sandia Laboratories, 87115, Albuquerque, NM

    Nicholas J. Magnani (Supervisor)

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  1. Nicholas J. Magnani
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Magnani, N.J. Acoustic emission and stress-corrosion cracking of U-4 1/2 wt%Nb. Experimental Mechanics 13, 526–530 (1973). https://doi.org/10.1007/BF02322341

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  • DOI: https://doi.org/10.1007/BF02322341

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