A STUDY OF STRESS-CORROSION CRACKING BY WEDGE-FORCE LOADING
BOEING COMMERCIAL AIRPLANE CO RENTON WA
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Wedge-force loading a center-cracked sheet specimen provides a unique resolution of whether stress-corrosion cracking SCC depends on an applied crack-tip stress-intensity factor or on net-section stresses. With this loading, crack extension causes a decreasing stress-intensity factor at the crack tip, while the net-section stresses increase. Therefore, when stress- corrosion crack growth is arrested in this specimen, the dependency on stress intensity is proved. The stress intensity at arrest agrees remarkably well with K sub SCC values determined by more conventional techniques that establish crack initiation thresholds through multiple tests. Crack growth rate data important to the establishment of inspection intervals in structure can also be obtained. Finally, the technique affords considerable economy of test time and material costs in stress-corrosion studies.
- Properties of Metals and Alloys