The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 18, 1991
Filed:
May. 31, 1990
Ioannis Vardoulakis, Minneapolis, MN (US);
Joseph F Labuz, St. Paul, MN (US);
Euripides Papamichos, St. Paul, MN (US);
Regents of the University of Minnesota, Minneapolis, MN (US);
Abstract
A compression test apparatus for geomaterial, such as rock or concrete, samples that is designed to provide measurements of a stress displacement characteristics of the failure zone. A geomaterial formed into a specimen comprising a right rectangular prism is supported by walls along two parallel faces and a back face. An axial load is kinematically applied by a plate that is suitably guided for movement against the specimen which is supported on bottom support plate. All of the surfaces in contact with the specimen are lined with hardened and polished steel plates and lubricated to minimize friction. The assembly of the specimen and its supports is in a conventional loading frame so that an axial load can be applied to one end of the specimen and reacted against the bottom plate. Displacement transducers monitor the lateral displacement of an unrestrained side surface of the specimen.