Experimental study on the effect of misfit and mismatch of ship plating welds
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Authors
Bebermeyer, Robert E.
Subjects
Advisors
Wierzbicki, Tomasz
Date of Issue
2002-06
Date
June 2002
Publisher
Monterey California. Naval Postgraduate School
Language
en_US
Abstract
Misfits and mismatches in the welding of ship hull plating may affect survivability after explosions, accidents, or other extreme external forces. Experiments, Slip Line Theory (SLT), and Finite Element Analysis (FEA) help to explain the necking, deformation, and mechanisms of fracture of misfit welded plating. The effect of misfits or offsets on both overmatched and evenmatched welds under tension are studied. The tension creates a moment about the offset weld causing the weld to rotate and the material around the weld to thin down, but strain hardening reduces the thinning that occurs and shifts deformation elsewhere away from the weld. EH-36, a commercial medium strength steel now being used in Navy surface combatants, was tested. The overmatched EH-36 misfit welds experienced rotation, minor thinning near the weld, and deformation elsewhere as predicted. AL6XN, a new stainless steel with evenmatched welds, gave nearly the same results as the EH-36. There was a 3% reduction in maximum applied force per area for the 30% offset case, and an increase in the amount of thinning near the weld.
Type
Thesis
Description
CIVINS (Civilian Institutions) Thesis document
Series/Report No
Department
Mechanical Engineering
Ocean Engineering
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
66 leaves : ill.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.