Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specimen clamp – holder – or support
Patent
1998-04-06
1999-05-18
Dougherty, Elizabeth L.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specimen clamp, holder, or support
73819, 73853, G01N3/02
Patent
active
059052058
ABSTRACT:
A new apparatus and method for applying a biaxial load to a flat plate test specimen is disclosed. A rhombus-shaped four-bar linkage is attached at one vertex to a fixed attachment point and a uniaxial tensile force is applied to the opposite vertex. The test specimen is placed inside the four-bar linkage and is attached to the four bar linkage by load transfer members connected at one end to the links of the four bar linkage and at their other end to grips holding the test specimen. In one embodiment, load transfer members parallel to the applied uniaxial tensile force are attached to test specimen grips adjacent to the link attachment points of the load transfer members and perpendicular load transfer members are attached to test specimen grips opposite their link attachment points. Application of the uniaxial tensile force then produces a biaxial tensile force in the test specimen. By attaching all load transfer members to test specimen grips adjacent to their link attachment points, a biaxial stress state tensile in one direction and compressive in a perpendicular direction can be accomplished.
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Dougherty Elizabeth L.
Kundert Thomas L.
Sinder Fredric L.
The United States of America as represented by the Secretary of
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