Method and means for biaxially testing material
AssigneeAnamet Laboratories, Inc.
InventorNeil L. Holt
Life of this patent
Estimating the term…
Abstract
A thin-wall tube specimen is biaxially tested for stress analysis by applying compressive axial stress and either internal surface pressure or external surface pressure to the specimen. Torsion is not required. The sample is positioned between platens which are assembled inside a pressure collet. Axial compressive stress is applied through the platens to the specimen, and hydraulic pressure is applied through the assembly to the internal and external cylindrical surfaces of the specimen. Rubber bladders may be employed when applying the surface pressures.
Claims15
Biaxial test apparatus for cylindrical material samples comprising
- a first platen having an outer surface, an inner cylindrical surface, and a sample receiving surface at one end of said first platen,
- a second platen having a cylindrical first portion for insertion into said first platen, a second portion, and a sample receiving surface on said second portion extending outwardly from said first portion, and
- means for applying pressure to a cylindrical surface of a sample when mounted between said first platen and said second platen.
The method of biaxially stress testing a test sample having internal and external cylindrical surfaces comprising the steps of
- (a) providing a lubricant at each end of said sample to compensate for surface irregularities and equalize loading of said sample ends,
- (b) loading said sample and said lubricants between first and second platens,
- (c) applying axial stress to said sample through said first and second platens, and,
- (d) concurrently applying pressure to a cylindrical surface of said sample.
Dependencies are inferred from the claim text.