Nonlinear analysis of pipe whip

Correlation analyses of selected CEA pipe whip tests were performed utilizing the ABAQUS-EPGEN finite element code. The analysis included the effects of large deformation and strain rate on resisting moment and energy absorption at the impact region. Three different modeling approaches were employed in conducting the correlation analysis. Of which, two modeled the entire pipe section consisting of beam elements with nonlinear spring derived from static crushing of a circular ring simulating dynamic pipe crushing at the impact region. The third one modeled the straight section of pipe as beam with full shell representation at the elbow impact region. Analysis results of time to impact, impact velocities, and impact forces were compared to test data. The measured impact time and forces were compared with the ones obtained per the approach described in ANSI 58.2 Standard. (orig.)