NDLI: Theoretical model of the effect of crack tip blunting on the ultimate tensile strength of welds in 2219-t87 aluminum

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Theoretical model of the effect of crack tip blunting on the ultimate tensile strength of welds in 2219-t87 aluminum

Content Provider	NASA Technical Reports Server (NTRS)
Author	Beil, R. J.
Copyright Year	1982
Description	A theoretical model representing blunting of a crack tip radius through diffusion of vacancies is presented. The model serves as the basis for a computer program which calculates changes, due to successive weld heat passes, in the ultimate tensile strength of 2219-T81 aluminum. In order for the model to yield changes of the same order in the ultimate tensile strength as that observed experimentally, a crack tip radius of the order of .001 microns is required. Such sharp cracks could arise in the fusion zone of a weld from shrinkage cavities or decohered phase boundaries between dendrites and the eutectic phase, or, possibly, from plastic deformation due to thermal stresses encountered during the welding process. Microstructural observations up to X2000 (resolution of about .1 micron) did not, in the fusion zone, show structural details which changed significantly under the influence of a heat pass, with the exception of possible small changes in the configuration of the interdendritic eutectic and in porosity build-up in the remelt zone.
File Size	2688869
Page Count	39
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19830009096
Archival Resource Key	ark:/13960/t3sv2dp1j
Language	English
Publisher Date	1982-08-01
Access Restriction	Open
Subject Keyword	Metallic Materials Cracks Dendritic Crystals Aluminum Eutectics Weld Strength Blunt Bodies Mathematical Models Porosity Microstructure Tensile Strength Computer Programs Tips Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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