Control of structural performances in load-bearing components by means of strength-altering, friction stir processed pattern

Patent No. 9,290,833

Issued: March 22, 2016
PCT Filed: April 29, 2011 
PCT No.: PCT/US2011/034473 
371(c)(1),(2),(4) Date: April 16, 2013 
PCT Pub. No.: WO2011/137300
Term Extension:  days

Inventor: Dawson; Paul R. (Ithaca, NY)
Assignee: Cornell University (Ithaca, NY)

A method of controlling the location at which yielding initiates a load bearing component and the collapse mode that is activated at the site of yielding for a designated type of loading is claimed. The steps include selecting a desired area of deformation and a kinematic mode of collapse; selecting a strength-altering pattern including at least a strengthening or weakening zone to control the location in a component where plastic deformation occurs, such that the pattern causes deformation to proceed into a desired collapse mode or shape with the component is subjected to design loading; and applying the strength-altering pattern to the component by friction stir processing, forming at least a strengthened or weakened zone relative to the base material of the component.


This application claims one or more inventions which were disclosed in U.S. Provisional Application No. 61/343,496, filed Apr. 30, 2010, entitled "CONTROL OF STRUCTURAL PERFORMANCES IN LOAD-BEARING COMPONENTS BY MEANS OF STRENGTH-ALTERING, FRICTION STIR PROCESSED PATTERNS". The benefit under 35 USC 119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.


This invention was made with Government support under Sponsor's Project ID: N00014-09-1-0447, awarded by the DOD (NAVY-ONR). The government has certain rights in the invention.

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