Detection of Fatigue Damage Prior to Crack Initiation withScanning SQUID Microscopy

Journal Article · Sun Nov 06 19:00:00 EST 2005 · Review of Progress in Quantitative NondestructiveEvaluation

OSTI ID:903041

Lee, Tae-Kyu; Morris, Jr, J W; Lee, Seungkyun; Clarke, John

The remanence fields of fatigued ferritic steel specimens were measured using a scanning microscope based on a high transition temperature Superconducting Quantum Interference Device (SQUID). The results show an overall increase of remanence until dislocation density saturates and an additional local remanence increase after saturation during cyclic loading. Because of the combined magnetic and spatial resolution of the SQUID microscope, these local changes of dislocation structures can be detected before a crack actually initiates, and identify the sites where crack nucleation will occur.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Office of Basic EnergySciences. Materials Science and Engineering Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 903041
• Report Number(s): LBNL--59250; BnR: KC0202020
• Journal Information: Review of Progress in Quantitative NondestructiveEvaluation, Journal Name: Review of Progress in Quantitative NondestructiveEvaluation Vol. 820
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DETECTION
DISLOCATIONS
FERRITIC STEELS
MICROSCOPES
MICROSCOPY
NUCLEATION
SATURATION
SPATIAL RESOLUTION
SQUID DEVICES
TRANSITION TEMPERATURE