Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Reexamination Certificate
2005-09-14
2009-02-03
Le, John H (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
C073S081000, C073S082000, C073S865300, C702S033000
Reexamination Certificate
active
07487051
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.
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International Search Report for PCT/KR2005/003039 dated Dec. 20, 2005 ISA/KR.
Choi Yeol
Kim Kwang-Ho
Lee Jung-Suk
Seo Yang-Won
Frontics Inc.
Harness & Dickey & Pierce P.L.C.
Le John H
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