Ship Hull Plating Weld Misalignment Effects When Subjected to Tension
Abstract
Precision fabrication of ships is advancing. Welding is ubiquitous in ship construction and military standards have specified tolerances for joining plates in naval combatants. Precision manufacturing will allow the production of ships with smaller hull plate misalignments. A benefit from this could be improved ship survivability when subjected to underwater explosions. Slip Line Fracture Mechanics interacting with Finite Element Analysis (FEA) gives insight into the deformation, necking and fracture mechanisms of typical over-matched welds. The weld rotates with local necking until the plates are aligned and then shears off. FEA showed the importance of deformed geometry in promoting final fracture by slip from the toe of the weld in non-hardening material. Graphical results indicate that for a non-hardening material with an offset of 15% of the plate thickness, which is within current military standards, weld rotation of 4-6 deg and local plate thinning of 4-5% in the region next to the weld can be expected. A test specimen showed a 4 deg weld rotation but did not provide the plane-strain condition and failed by necking away from the weld. A re-design is suggested.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2001
- Accession Number
- ADA393173
Entities
People
- M. C. Weaver
Organizations
- United States Department of the Navy