Ratcheting in cyclic plasticity of a pipe elbow loaded by prescribed multiaxial stochastic displacement time series
- Stevenson and Associates, Inc., Cleveland, OH (United States)
- Electric Power Research Institute, Palo Alto, CA (United States). Dept. of Nuclear Safety
- Case Western Reserve Univ., Cleveland, OH (United States). Civil Engineering Dept.
The research and application of ratcheting behaviors in cyclic plasticity are ongoing safety margin topics with respect to the excessive conservatism issues of the seismic design of nuclear piping under strong earthquake loads. In this paper the cycle dependent ratcheting behavior in a typical pressurized pipe elbow was investigated in quantitative manner using a nonlinear shell element model that can give detailed stress and strain distribution time histories for the whole elbow. The nonlinear time history stress analyses performed are based on a pseudo static concept using the multiaxial stochastic loadings of displacement response time series at the elbow ends that were obtained directly through the random vibration analyses of a realistic full size piping system and its supporting building. The effects of excitation level, internal pressure, and material yield stress were investigated.
- OSTI ID:
- 170334
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1343-6
- Country of Publication:
- United States
- Language:
- English
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