Patents by Inventor Stephen J. Holdbrook

Stephen J. Holdbrook 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).

  • Systems and methods for performing stress intensity factor calculations using non-singular finite elements
    Patent number: 8688415
    Abstract: Systems and methods are disclosed for determining stress intensity factors. In one or more embodiments, the method can include the steps of defining a crack tip zone about one or more crack tips of one or more arbitrarily shaped cracks in an arbitrarily shaped solid. The one or more crack tip zones can be constrained within a finite element model representation mesh of the arbitrarily shaped solid to provide one or more constrained crack tip zones. The combination of the finite element model representation mesh and the one or more constrained crack tip zones can be processed to determine the stress intensity factor for each of the one or more arbitrarily shaped cracks.
    Type: Grant
    Filed: February 2, 2011
    Date of Patent: April 1, 2014
    Assignee: Kellogg Brown & Root LLC
    Inventor: Stephen J. Holdbrook
  • Systems and Methods for Performing Stress Intensity Factor Calculations Using Non-Singluar Finite Elements
    Publication number: 20110191074
    Abstract: Systems and methods are disclosed for determining stress intensity factors. In one or more embodiments, the method can include the steps of defining a crack tip zone about one or more crack tips of one or more arbitrarily shaped cracks in an arbitrarily shaped solid. The one or more crack tip zones can be constrained within a finite element model representation mesh of the arbitrarily shaped solid to provide one or more constrained crack tip zones. The combination of the finite element model representation mesh and the one or more constrained crack tip zones can be processed to determine the stress intensity factor for each of the one or more arbitrarily shaped cracks.
    Type: Application
    Filed: February 2, 2011
    Publication date: August 4, 2011
    Applicant: KELLOGG BROWN & ROOT LLC
    Inventor: Stephen J. Holdbrook