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http://dx.doi.org/10.20466/KPVP.2018.14.2.024

Strain-based Damage Evaluation of Specimens under Large Seismic Loads  

Kweon, Hyeong Do (한국수력원자력(주) 중앙연구원)
Heo, Eun Ju (한국수력원자력(주) 중앙연구원)
Lee, Jong Min (고려대학교 기계공학과)
Kim, Jin Weon (조선대학교 원자력공학과)
Publication Information
Transactions of the Korean Society of Pressure Vessels and Piping / v.14, no.2, 2018 , pp. 24-31 More about this Journal
Abstract
In this paper, specimen tests with simulated large seismic conditions have been carried out to investigate damage characteristics such as structural deformation and crack initiation under seismic loading. The mechanical behavior of the specimens is predicted by numerical simulations and the strain-based damage evaluations are performed. Finite element analyses of the specimens under the simulated seismic loading at room and operating temperatures were carried out for low alloy steel and stainless steel materials. Peak strain amplitude, cumulative fatigue damage and cumulative strain limit damage are calculated considering the nature of cyclic loading. In all cases, the allowable damage criteria are exceeded at the time of observing cracks visually in the tests. Therefore, it is confirmed that the material behavior due to the large seismic loads can be predicted by the numerical method and the structural damage of the materials can be evaluated conservatively based on the strain criteria.
Keywords
Cyclic Loading; Damage Evaluation; Seismic; Strain-based;
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