Patents by Inventor Joanna Rakowska

Joanna Rakowska 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 and apparatus for predicting belt separation failure in aging tires by computer simulation
    Patent number: 7469200
    Abstract: A method has been invented for predicting the build-up of heat, material aging, and subsequent belt separation failure in rolling steel-belted pneumatic tires (20). The procedure employs finite element analysis and a new fatigue crack propagation model that takes output generated by the finite element model to predict distance and time to belt separation in the tire. The finite element model uses input information on tire load, speed and inflation pressure (12) to calculate the temperature and energy release rate at the corresponding tips of the fatigue crack to generate four-dimensional response surfaces of crack-tip energy release rate as a function of crack length, crack-tip circumferential angular position, and crack-tip temperature. The fatigue crack propagation model samples the response surface and is numerically integrated to predict distance and/or time to belt separation failure (30).
    Type: Grant
    Filed: May 14, 2003
    Date of Patent: December 23, 2008
    Assignee: Ford Global Technologies, LLC
    Inventors: Kenneth Nero Morman, Jr., Joanna Rakowska, Sheng-Yuan Hsu
  • Method and apparatus for predicting belt separation failure in aging tires by computer simulation
    Publication number: 20040230412
    Abstract: A method has been invented for predicting the build-up of heat, material aging, and subsequent belt separation failure in rolling steel-belted pneumatic tires (20). The procedure employs finite element analysis and a new fatigue crack propagation model that takes output generated by the finite element model to predict distance and time to belt separation in the tire. The finite element model uses input information on tire load, speed and inflation pressure (12) to calculate the temperature and energy release rate at the corresponding tips of the fatigue crack to generate four-dimensional response surfaces of crack-tip energy release rate as a function of crack length, crack-tip circumferential angular position, and crack-tip temperature. The fatigue crack propagation model samples the response surface and is numerically integrated to predict distance and/or time to belt separation failure (30).
    Type: Application
    Filed: May 14, 2003
    Publication date: November 18, 2004
    Inventors: Kenneth Nero Morman, Joanna Rakowska, Sheng-Yuan Hsu