A STUDY OF STRESS-CORROSION CRACKING BY WEDGE-FORCE LOADING

reportActive / Technical Report | Accession Number: AD0661811 | Open PDF

Abstract:

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.

Author(s):
Smith, Harold R. ; Piper, Donald E. ; Downey, Frank K.
Author Organization(s):
BOEING COMMERCIAL AIRPLANE CO RENTON WA
Descriptive Note:
Research rept.
Supplementary Note:
DOI: 10.21236/AD0661811
Pagination:
0012

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
D6-19768
Contract/Grant Number(s):
N00014-66-C-0365, ARPA ORDER-878
Monitor Series:
DARPA
 Subject Terms
Joint Capability Areas:
JCA_1.3_Human Capital Management; JCA_1_Force Support; JCA_5.3_Planning; JCA_5_Command and Control
Communities of Interest:
Air Platforms
Descriptor(s):
*CRACKS, *STRESS CORROSION, STRESSES, TOUGHNESS, TITANIUM ALLOYS, SHEETS, CRACK PROPAGATION, LOADS(FORCES)
Field(s)/Group(s):
Properties of Metals and Alloys, Mechanics
Report Date:
1967 Jun 01