Case Study of Shakedown Evaluation of a Shell With Nozzle Based on Elastic-Plastic Analysis

In the past, shakedown evaluation was usually based on the elastic method that the sum of the primary and secondary stress should be limited to 3S_m or the simplified elastic-plastic analysis method. The elastic method is just an approximate analysis, and the rigorous evaluation of shakedown normally requires an elastic-plastic analysis. In this paper, using an elastic perfectly plastic material model, the shakedown analysis was performed by a series of elastic-plastic analyses. Taking a shell with a nozzle subjected to parameterized temperature loads as an example, the impact of temperature change on the shakedown load was discussed and the shakedown loads of this structure at different temperature change rates were also obtained. This study can provide helpful references for engineering design.