The Effect of Internal Fluid on Pressure Vessel and Piping Shock Stresses and Dynamic Pressures

摘要

It is the objective of this paper to present an experimental and analytical evaluation of shock stresses and dynamic pressures in a pressure vessel with an attached pipe subjected to shock loading. In this project, a pressure vessel with an attached vertical pipe at the center of a pressure vessel head was designed and fabricated. The pressurized system was shock tested on a Floating Shock Platform (FSP). Shock pressures in the internal pressurized water and stresses in the vessel wall were measured. Experimental results are compared to analyses. Two types of analyses were conducted. First the system was analyzed with the ABAQUS finite element code using acoustic elements for the internal fluid and shell elements for the structure of the pressure vessel and piping. Inputs to the ABAQUS model were based on measured time-history FSP shock motions. Secondly, a design model composed of springs and lumped masses for the internal fluid and beam elements for the pressure vessel and piping structure was developed using the ANSYS finite element program. Both time-history FSP shock motions and a shock spectrum of the measured inputs were used in analyses with the lumped mass model. Analytical results of both models were compared to measurements from FSP testing and to each other. One of the main objectives of the research is to develop a design approach based on lumped mass modeling for this class of problems.