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:
Jan. 14, 1992
Filed:
Jun. 25, 1990
Applicant:
Inventor:
Allen C Eberhardt, Raleigh, NC (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73799 ; 73812 ; 324693 ;
Abstract
A fatigue testing system subjects a test specimen to a rotary stress applied about an axis at one or both ends which is perpendicular to the axis of the test specimen. The stress applied may be selected from sinusoidal, random, impulse or a signal generated by the stresses applied to an actual in service specimen. A servo applies the stress to the test specimen through a coupler and the changes in the electrical resistance of a portion of the test specimen is sensed to detect the initiation and propagation of a stress failure.