Dynamic Tests of Cracked Pipe Components

[+] Author and Article Information
D. A. Hale

General Electric Company, Nuclear Energy Business Operations, San Jose, Calif. 95125

J. D. Heald, S. R. Sharma

S. Levy, Inc., Campbell, Calif.

J. Pressure Vessel Technol 106(1), 37-46 (Feb 01, 1984) (10 pages) doi:10.1115/1.3264307 History: Received February 08, 1983; Revised October 03, 1983; Online November 05, 2009


Dynamic tests were conducted involving notched sections of 4-in. (10-cm) stainless steel and Inconel-600 pipe. The specimen was a four-point bending beam with end masses sized to give an elastic first-mode frequency near that of typical field-installed piping systems (15 Hz). Specimens were loaded using sinewave excitation at this first mode natural frequency. Specimen response was compared to predictions from an elastic-plastic dynamic analysis previously developed on this program. In addition, specimen loads at failure were compared to those predicted from a net section collapse failure criterion. The results confirmed that the elastic-plastic dynamic analysis adequately predicted the dynamic response of flawed pipes under seismic-type excitation. Furthermore, net section collapse does not occur under dynamic loading conditions which simulate natural frequencies of as-installed light water reactor piping systems. Finally, a net section collapse criterion yields conservative estimates of the load capacity of flawed pipe sections provided crack growth is properly accounted for.

Copyright © 1984 by ASME
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