DEVELOPMENT OF EVALUATION METHOD FOR SEISMIC ISOLATION SYSTEMS OF NUCLEAR POWER FACILITIES - BREAK TEST OF FULL SCALE LEAD RUBBER BEARINGS FOR NUCLEAR FACILITIES, PART3 FINITE ELEMENT ANALYSIS MODEL FOR BREAK TEST-

摘要

In the previous report, other part of this series of papers (Imaoka et al. (2015) and Nakayama et al. (2015)), break test results of full-scale lead rubber bearing (LRB) were shown. In this report, we propose finite element analysis (FEA) model which can trace the break test results for the purpose of prediction of LRB break characteristics. In the case of modelling FEA for rubber bearings, selection of material model for rubber is important. As a rubber material model, we select hyper-elastic model which can represent the softening under tri-axial tensile deformation. First, details of proposed FEA model are shown. Second, we show the validity of proposed model by comparing with break test results of relation between shear/tensile stress and shear/tensile strain. Finally, breaking criteria of LRB is suggested.