US 7,650,795 B2Granted

Test cell for applying a shear stress to a test specimen

AssigneeThe Board of Regents of the University of Oklahoma

InventorsYounane Abousleiman, John Brumley, Vinh Ngyuen, Son K. Hoang, Ashraf Al-Tahini

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Abstract

A test cell and method for stress testing a test specimen including a first platen and a second platen. Each platen having a loading surface, an inclined surface, and a longitudinal axis. The inclined surface being inclined relative to the longitudinal axis at an angle and the inclined surface having a specimen recess formed therein for receiving a portion of the test specimen such that when the inclined surface of the second platen is positioned in a face-to-face relationship with the inclined surface of the first platen, a shear stress is applied to the test specimen when an axial load is applied to the first and second platens. The platens further including fluid ports to subject the test specimen to fluid flow at various pressures and fluid chemistries and ultrasonic transducers to determine acoustic, compressional, and shear wave velocities and in multiple orientations.

Claims22

Dependent claims

A test cell for stress testing a test specimen, comprising:

a first platen having a loading surface, an inclined surface, and a longitudinal axis extending from the loading surface to the inclined surface, the inclined surface of the first platen being inclined relative to a first plane perpendicular to the longitudinal axis of the first platen at an angle greater than zero degrees, the inclined surface having a specimen recess formed therein for receiving a portion of the test specimen, the specimen recess having a base formed parallel to the inclined surface;
and
a second platen having a loading surface, an inclined surface, and a longitudinal axis extending from the loading surface to the inclined surface, the inclined surface of the second platen being inclined relative to a second plane perpendicular to the longitudinal axis of the second platen at an angle greater than zero degrees, the inclined surface having a specimen recess formed therein for receiving another portion of the test specimen, the specimen recess of the second platen having a base formed parallel to the inclined surface of the second platen, the second platen being substantially axially aligned with the first platen and the inclined surface of the second platen being positioned in a face-to-face, parallel relationship with the inclined surface of the first platen such that a shear stress is applied to the test specimen when the test specimen is positioned in the specimen recess of the first platen and the specimen recess of the second platen and a longitudinal axial load is applied to the first and second platens.

A method of stress testing a test specimen, comprising:

positioning the test specimen in a test cell comprising:
a first platen having a loading surface, an inclined surface, and a longitudinal axis extending from the loading surface to the inclined surface, the inclined surface of the first platen being inclined relative to a first plane perpendicular to the longitudinal axis of the first platen at an angle greater than zero degrees, the inclined surface having a specimen recess formed therein for receiving a portion of the test specimen, the specimen recess having a base formed parallel to the inclined surface;
and
a second platen having a loading surface, a inclined surface, and a longitudinal axis extending from the loading surface to the inclined surface, the inclined surface of the second platen being inclined relative to a second plane perpendicular to the longitudinal axis of the second platen at an angle greater than zero degrees, the inclined surface of the second platen having a specimen recess formed therein for receiving another portion of the test specimen, the specimen recess of the second platen having a base formed parallel to the inclined surface thereof, the second platen being substantially axially aligned with the first platen and the inclined surface of the second platen being positioned in a face-to-face, parallel relationship with the inclined surface of the first platen with the test specimen positioned in the specimen recess of the first platen and the specimen recess of the second platen;
and
applying a longitudinal axial load to the first and second platens such that a shear stress is applied to the test specimen.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/045,423Filed 10 Mar 2008 · us provisional application
Priority: 9 Mar 2007
Published: US 2008/0216584 A111 Sep 2008
Granted: 26 Jan 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01N 3/24
Investigating strength properties of solid materials by application of mechanical stress: by applying steady shearing forces
G01N 2203/0266
Shape of the specimen: cylindrical specimens
G01N 2203/0435
Chucks, fixtures, jaws, holders or anvils: modifying the type of the force applied, e.g. the chuck transforms a compressive machine for applying a…
G01N
Investigating or analysing materials by determining their chemical or physical properties