Accession Number:

ADD020246

Title:

Biaxial and Shear Testing Apparatus with Force Controls

Descriptive Note:

Patent application, Filed 30 Mar 2006

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

2006-03-30

Pagination or Media Count:

45.0

Abstract:

It is an object of the present invention to provide a testing apparatus capable of applying controllable loading forces to be measured for a test specimen. A further object of the present invention is to provide a testing apparatus capable of having a different loading mode in each axis of the plane of the test specimen that is, tension loading in one axis and compression loading is another axis. A still further object of the present invention is to provide a testing apparatus for in-plane shear and compression andor tensional testing of orthotropic and anisotropic materials, such as composite materials, fabrics, etc., in a creep testing situation and other testing situations. A still further object of the present invention is to provide a testing apparatus capable of applying non-orthogonal controllable biaxial forces or equal biaxial displacements. To attain the objects described, the present invention improves the apparatus of the Cavallaro reference, and therefore the known art, wherein a tensile or compressive load of a test apparatus can be converted to an unequal, orthogonal or oblique stress state on a planar test specimen by the use of two andor four load plate assemblies and a controllable fluid pressure system. Six load plate assemblies for a tri-axial loading may also be employed with the controllable fluid pressure system.

Subject Categories:

  • Mechanics
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE