The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 17, 2009
Filed:
Jan. 24, 2003
Lyle R. Deobald, Shoreline, WA (US);
Bernhard Dopker, Bellevue, WA (US);
Gerald E. Mabson, Bellevue, WA (US);
Lyle R. Deobald, Shoreline, WA (US);
Bernhard Dopker, Bellevue, WA (US);
Gerald E. Mabson, Bellevue, WA (US);
The Boeing Company, Chicago, IL (US);
Abstract
A finite element method for predicting crack opening and propagation entails defining a succession of overlapping interface elements at a potential crack plane, each element having a bound node pair and side node pairs spaced from the bound node pair to sense approach of a crack. An energy-based fracture mechanics criterion determines whether release occurs at the bound nodes and, if so, the displacement between the bound nodes is calculated based on a strain softening law. The process is repeated for each element in sequence.