Patents by Inventor Yang-Won Seo

Yang-Won Seo 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).

  • Evaluating method of the fracture toughness using the continuous indentation method
    Patent number: 7487051
    Abstract: The present invention relates to a method of evaluating the fracture toughness of a material using the continuous indentation technique. In the method of this invention, the stress coefficient, strain hardening modulus and yield stress of the material are determined using the continuous indentation technique and, thereafter, the reduced elastic modulus (Er) of the material is calculated. The effective elastic modulus and the initial elastic modulus are calculated and, thereafter, the damage parameter is calculated using the void volume fraction. The critical elastic modulus and the characteristic fracture initiation point of the indentation depth are determined using the damage parameter and, thereafter, the fracture toughness of the material is evaluated. The present invention is advantageous in that the fracture toughness of a brittle material can be evaluated precisely using a nondestructive evaluation technique.
    Type: Grant
    Filed: September 14, 2005
    Date of Patent: February 3, 2009
    Assignee: Frontics, Inc.
    Inventors: Kwang-Ho Kim, Jung-Suk Lee, Yang-Won Seo, Yeol Choi
  • Evaluating Method of the Fracture Toughness Using the Continuous Indentation Method
    Publication number: 20080010031
    Abstract: The present invention relates to a method of evaluating the fracture toughness of a material using the continuous indentation technique. In the method of this invention, the stress coefficient, strain hardening modulus and yield stress of the material are determined using the continuous indentation technique and, thereafter, the reduced elastic modulus (Er) of the material is calculated. The effective elastic modulus and the initial elastic modulus are calculated and, thereafter, the damage parameter is calculated using the void volume fraction. The critical elastic modulus and the characteristic fracture initiation point of the indentation depth are determined using the damage parameter and, thereafter, the fracture toughness of the material is evaluated. The present invention is advantageous in that the fracture toughness of a brittle material can be evaluated precisely using a nondestructive evaluation technique.
    Type: Application
    Filed: September 14, 2005
    Publication date: January 10, 2008
    Applicant: Frontics, Inc.
    Inventors: Kwang Ho Kim, Jung-Suk Lee, Yang-Won Seo, Yeol Choi