The NTIS website and supporting ordering systems are undergoing a major upgrade from 8PM on September 25th through approximately October 6. During that time, much of the functionality, including subscription and product ordering, shipping, etc., will not be available. You may call NTIS at 1-800-553-6847 or (703) 605-6000 to place an order but you should expect delayed shipment. Please do NOT include credit card numbers in any email you might send NTIS.
Documents in the NTIS Technical Reports collection are the results of federally funded research. They are directly submitted to or collected by NTIS from Federal agencies for permanent accessibility to industry, academia and the public.  Before purchasing from NTIS, you may want to check for free access from (1) the issuing organization's website; (2) the U.S. Government Printing Office's Federal Digital System website http://www.gpo.gov/fdsys; (3) the federal government Internet portal USA.gov; or (4) a web search conducted using a commercial search engine such as http://www.google.com.
Accession Number ADA587087
Title Influence and Modeling of Residual Stresses in Thick Walled Pressure Vessels with Through Holes.
Publication Date Feb 2012
Media Count 22p
Personal Author A. P. Parker E. Troiano J. H. Izzo
Abstract This study utilizes the classic stress based Paris Law fatigue life approach which takes into account the residual stresses as a function of radial location to assess the life of the vessel in the region of both configurations of through holes. It quantifies the concentration of stresses associated with the perpendicular and angled evacuator holes, and the amount of pressure that actually enters the evacuator hole. The analysis is employed to ensure that the life within these through holes meets or exceeds the safe life of the vessel without evacuator holes which has been determined by the 90% lower confidence bound on the 0.1th percentile on the population from the results of a minimum of six tests.
Keywords Autofrettage
Bauschinger effect
Evacuator hole
Fatigue life
Holes(Openings)
Life expectancy(Service life)
Paris law
Pressure vessels
Residual stress
Thick walls


 
Source Agency Non Paid ADAS
NTIS Subject Category 41 - Manufacturing Technology
79E - Detonations, Explosion Effects, & Ballistics
Corporate Author Army Armament Research, Development and Engineering Center, Watervliet, NY. Benet Labs.
Document Type Technical report
Title Note Conference paper.
NTIS Issue Number 1405
Contract Number N/A

Science and Technology Highlights

See a sampling of the latest scientific, technical and engineering information from NTIS in the NTIS Technical Reports Newsletter

Acrobat Reader Mobile    Acrobat Reader