Fracture Analysis of Pressure Vessel under Dynamic Loading and Thermal Effect
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Date
2009-06
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Addis Ababa University
Abstract
Pressure vessel system has an extremely broad range of application, from simple storage
vessels to complicated reactor pressure vessels. The causes of failure in pressure vessels
are mainly related to fracture. To avoid appalling failure, it is important to study their
fracture characteristics at the design stage and even during operation for maintenance
process. The thesis work has investigated the fracture behavior of pressure vessels under
dynamic loading.
The pressure vessel is modeled for longitudinal, circumferential and edge cracks for thin
and thick walled pressure vessels. The solution to the equation of motion is obtained by
transient analysis and finite element method employing a twenty-node brick element.
The model is developed and analyzed using ANSYS. The study includes dynamic
fracture analyses for longitudinal, circumferential and edge cracks, to obtain dynamic
stress intensity factor. Also included are the stress and deflection analysis as time
response. The validity of the results obtained from the research is verified by comparing
with results obtained for numerical static analysis with analytical solution and previously
published by other researchers, and good agreement is obtained.
Key words:
Pressure Vessel, Crack, Dynamic Loading, Dynamic Fracture Analysis, Thermal Shock,
Stress Wave, Quasi-static Stress Intensity Factor, Dynamic Stress Intensity Factor
Description
Keywords
Pressure Vessel; Crack; Dynamic Loading; Dynamic Fracture Analysis; Thermal Shock; Stress Wave; Quasi-static Stress Intensity Factor; Dynamic Stress Intensity Factor