Patents by Inventor Angela Hubner

Angela Hubner 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).

  • Method of predicting crack initiation based fatigue life
    Patent number: 5736645
    Abstract: A method of predicting crack initiation based fatigue life includes the steps of plotting the elastic finite element stress states of a stress history for a given component at a predetermined critical location in the stress space and determining the least square fit ellipsoid of the stress states by a straight line through the center of gravity. An aspect ratio .lambda..sub.2 /.lambda..sub.1 is defined where .lambda..sub.1 and .lambda..sub.2 are the two largest eigen values of the eigen system of matrix M which defines the least square fit ellipsoid and where .lambda..sub.1 .gtoreq..lambda..sub.2. A multiaxial fatigue analysis is performed where the aspect ratio exceeds a predetermined value.
    Type: Grant
    Filed: January 16, 1997
    Date of Patent: April 7, 1998
    Assignee: Ford Global Technologies, Inc.
    Inventors: Chu Chin-Chan, Angela Hubner