Failure analysis of beta-C titanium alloy high-pressure vessels |
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Authors: | G J Feng J D Rossi M T Gerusky |
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Affiliation: | (1) Westmoreland Mechanical Testing & Research Inc., 15696 Youngstown, PA |
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Abstract: | An attempt has been made to apply the linear elastic fracture mechanics concept to Beta-C titanium alloy pressure vessels
that exhibited brittle fractures during hydrotesting. Based on the results of stress analysis on the real structures and fracture
surface examinations, a stress-intensity factor,K
IC, was estimated. TheK
IC value of the material in the cracking direction was measured by a surface semi-elliptical crack method. It was found that
theK
IC value of the material is very close to the estimated stress-intensity factorK
I during failure, which places the pressure vessels in a critical condition in that a small variation in flaw size may cause
a catastrophic failure. A compromise must be made betweenK
IC and the required yield strength. In this restricted case, the yield strength of the material should be controlled in the
range of 1150 to 1200 MPa to avoid brittle fracture and the possible occurrence of yield during hydrotesting. Control of microstructure
and other mechanical properties is also discussed in this investigation. |
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Keywords: | Analysis Beta-C titanium failure analysis fracture mechanics high pressure resource |
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