D Simplified Elastic-Plastic Analysis Method for Strain-Based Structural Integrity Assessment of Safety Class Components Metal Containments and Core Support Structures in Nuclear Power Plants under Service Level D or Beyond Design-Basis Earthquakes

摘要

An objective of the present invention is to provide a simplified elasticity-plasticity analysis method using an elasticity analysis result to easily consider a plastic deformation rate increase effect in a low frequency fatigue section. According to one embodiment of the present invention, the simplified elasticity-plasticity analysis method comprises the following steps of: calculating a penalty vector K_e; calculating a penalty vector K_v; calculating a penalty vector K_n; using the penalty vectors K_e, K_v, and K_n to calculate a final alternative stress intensity S_a and using the final alternative stress intensity S_alt to calculate an alternative equivalent deformation rate.