Method for the determination of shrinkage effect
AssigneeInstitutul de Cercetari si Proiectari Pentru Utilaj Chimic si Rafinarii
InventorAlexandru Ioan Muscan
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Abstract
A method of determining the shrinkage effect to be intentionally produced the manufacturing process in the fabrication of high-pressure cylindrical vessels wherein test samples are cut from the cylindrical body and transducers are mounted upon the inner face thereof. The body is subjected to fluid pressure and a strain (.epsilon..sub.p) is determined on two test samples cut from the body while the strain intensity (.epsilon..sub.pa) at the apparent proportionality limit is determined via the transducers, by detecting the hoop strain (.epsilon..sub.ipa) at the apparent proportionality limit (.epsilon..sub.pa = .alpha..epsilon..sub.ipa where .alpha. is a proportionality factor depending upon the vessel shape). The shrinkage effect is related to the difference of .epsilon..sub.p and .epsilon..sub.pa.
Claims1
A method of determining the shrinkage effect for a high-pressure cylindrical vessel in the body of which a shrinkage effect .epsilon..sub.if is induced, comprising subjecting a plurality of standard test samples from said body to tensile stress to determine the strain .epsilon..sub.p at the proportionality limit;
- applying strain gauges to said body and pressurizing the same with a fluid to determine the hoop strain .epsilon..sub.ipa at the apparent proportionality limit;
- deriving the strain intensity .epsilon..sub.pa at the apparent proportionality from the hoop strain .epsilon..sub.ipa corrected by a coefficient determined by the vessel shape, and determining the hoop strain .epsilon..sub.if as the difference between .epsilon..sub.pa and .epsilon..sub.p.
Dependencies are inferred from the claim text.