Autofrettage Process: Finite Element Simulation
And Experimental Validation
Author(s)
R. Drummond & T. Comlekci
Abstract
Autofrettage of benchmark cylindrical pressure vessels were carried out for two
types of low alloy steels. Non-linear finite element studies were first carried out in
order to find a safe autofrettage pressure with known yield strength and ultimate
tensile strength material property values from tensile tests. The residual stresses
and strains were predicted with the non-linear finite element analysis (FEA)
when the vessel was unloaded. The pressure vessels were strain gaged internally
and externally to validate the autofrettage FEA simulation. The response of the
internal strain gages under high hydrostatic pressure was not known therefore
strain gaged hydrostatic test pieces were used during the experiments. Through
measurement of the strain response with relation to the hydrostatic pressure
applied during the autofrettage experiment, hydrostatic correction factors were
found. These correction factors were applied to the pressure vessels’ internal strain
gage readings and compared with that of FEA. Strains during loading showed
good agreement, although measuring the residual strain levels experimentally was
found to be prone to error due to the variability of the material properties and
the accuracy of internal strain gage measurements subject to very high hydrostatic
pressure loading.
Keywords: autofrettage, validation, strain gage, hydrostatic correction, finite
element analysis.
Keywords
Keywords: autofrettage, validation, strain gage, hydrostatic correction, finite
element analysis.
Related Book
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