The influence of load line displacement on stress corrosion crack growth behavior of type 422 stainless steel in a sodium chloride solution has been investigated. The fatigue precracked specimens were loaded by applying a separating force (constant load) at the pinhole and by inserting a wedge (constant displacement) at the outside edge of the notch for crack growth study. The specimens loaded at the pin holes exhibited a significant stress corrosion crack growth. No crack growth was seen in the wedge loaded specimens after 21,000 hours of exposure, even at the maximum stress intensity investigated. This discrepancy in the crack growth was attributed to the stress intensity drop resulting from the load line displacement in the wedge loaded specimens. The effects of crack tip over-loading on crack growth were also discussed.

Subject
Constant load, Crack growth, Corrosion fatigue, Stress intensity, Corrosion rate, Fracture surfaces, Fatigue crack growth rate, Stress, Constants, Corrosion growth, Deflection, Steel, Stress corrosion cracking
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1988
Association for Materials Protection and Performance (AMPP)
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