Patents by Inventor Jonathan Dubke

Jonathan Dubke has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Determination of a threshold crack length
    Patent number: 9513200
    Abstract: A method for determining a threshold crack length in a machine component including a fatigue crack defining a fatigue crack length and a fatigue crack angle. The method includes determining a component threshold stress intensity factor for the fatigue crack angle, determined from a dataset that includes threshold stress intensity factors for mixed-mode phase angles formed by conducting an asymmetric four point bend test on a test specimen having an initial notch. The method includes determining a threshold crack length based on the component fatigue crack length and fatigue crack angle using a formula disclosed herein.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: December 6, 2016
    Assignee: ROLLS-ROYCE CORPORATION
    Inventors: Jonathan Dubke, Paul Brett Wheelock