Compact and Stand-Alone Combined Multi-Axial and Shear Test Apparatus
Patent application, filed 25 Sep 2009
DEPARTMENT OF THE NAVY WASHINGTON DC
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The present invention relates generally to a compact, stand-alone in-plane shear loading and biaxial tension or compression testing apparatus employable for studies of the mechanical properties of materials such as metals, plastics and composites. It is therefore a general purpose and primary object of the present invention to provide a compact, low cost and stand-alone material testing apparatus that is capable of applying combined multi-axial tensioncompression and in-plane shear loads to a test specimen in optional displacement-controlled or force-controlled modes without requiring a materials testing machine for operation of the apparatus. It is a further object of the present invention to provide, independently and without the need for a testing machine, the ability to test a specimen by subjecting the specimen to a combined in-plane, compression or tension as well as in-plane shear. In order to attain the objects described, the present invention relates generally to a combined simultaneously or independently in-plane shear and compression or tension loading of a test specimen such as but not limited to metals, plastics, composites, woods, fabrics or anisotropic materials. The apparatus is self-contained to operate independent of an external testing device. The apparatus can apply unequal, orthogonal or oblique stress states on a specimen by the use of load transfer systems comprising two rhombus-shaped scissor jack assemblies and a turntable.
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