Patents by Inventor William Vernon Mars

William Vernon Mars 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 article of manufacture for estimating material failure due to crack formation and growth
    Patent number: 6634236
    Abstract: A multiaxial strain cycle (32, 72) is received that is described by a strain tensor that is a function of time. A hyperelastic constitutive model (34, 74) corresponding to the material is received. A fatigue crack growth curve (36, 76) is obtained. A cracking energy density is calculated (50, 90) based on the constitutive model (34, 74) and the multiaxial strain cycle (32, 72). The cracking energy density is a function of material plane (44, 84) and indicates the portion of the total elastic strain energy density that is available to be released on a selected material plane (48, 88). A cracking plane is determined (54, 98) based upon the cracking energy density. A fatigue life is estimated (60, 100) based on the cracking plane and the fatigue crack growth curve (36, 76).
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: October 21, 2003
    Assignee: Cooper Technology Services, LLC
    Inventor: William Vernon Mars
  • Method and article of manufacture for estimating material failure due to crack formation and growth
    Publication number: 20020139194
    Abstract: A multiaxial strain cycle (32, 72) is received that is described by a strain tensor that is a function of time. A hyperelastic constitutive model (34, 74) corresponding to the material is received. A fatigue crack growth curve (36, 76) is obtained. A cracking energy density is calculated (50, 90) based on the constitutive model (34, 74) and the multiaxial strain cycle (32, 72). The cracking energy density is a function of material plane (44, 84) and indicates the portion of the total elastic strain energy density that is available to be released on a selected material plane (48, 88). A cracking plane is determined (54, 98) based upon the cracking energy density. A fatigue life is estimated (60, 100) based on the cracking plane and the fatigue crack growth curve (36, 76).
    Type: Application
    Filed: August 31, 2001
    Publication date: October 3, 2002
    Applicant: COOPER TIRE & RUBBER COMPANY
    Inventor: William Vernon Mars