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Project Number 3
Date of Summary June 30, 1981
Subject Incipient Crack Detection in Offshore Structures
Performing Activity Daedalean Associates, Inc.
Principal Investigator Dr. A. G. Hochrein
Contracting Agency Office of Naval Research
Completion Complete
Description A nondestructive evaluation (NDE) technique for detecting incipient cracking was developed by monitoring the internal damping characteristics of a structure. The application is being applied to offshore structures as a means for locating joints which are fatiguing and for monitoring and predicting structural life without putting personnel into the water. The Office of Naval Research (ONR) Structures Program is funding a computer-assisted NDE adjunct to this program.
Progress Complete. A four-legged, 14-foot high model offshore structure was built. The NDE technique was applied to the model and data was processed through a computer. Results on the model, in air, show that the technique revealed both incipient failures of joints and broken members. The technique was evaluated in an ONR-USGS program called the "NDE Round Robin." See Project No. 34.
Reports
AA (1.316 KB) File in Adobe's Portable Document Format (PDF) . Fresch, D. C., Yeager, L. L., Hochrein, Jr., A. A., Thiruvengadam, A. P., The Application of Non-destructive Evaluation Technique Utilizing the Phenomenon of Internal Function for Detecting Crack Formation in a Scale Model of an Offshore Structure, Daedalean Associates, Report DF-7763-001-TR, September 1978.
AB (3.491 KB) File in Adobe's Portable Document Format (PDF) . Jachowski, B., Fresch, D. C., Brasfield, R. G., Thiruvengadam, A. P., The Laboratory Application of a Nondestructive Evaluation Technique for Detecting Incipient Crack Formation in Model Offshore Structures, Daedalean Associates, Report LLY-7763-003-7R, May 1980.
 

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