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Technology
Assessment & Research (TA&R) Program
| 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 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 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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