Accession Number:

ADA484696

Title:

Design Optimization and Fatigue Analysis of Laser Stake Welded Connections

Descriptive Note:

Project rept. 1 Jan 2006-31 Dec 2007

Corporate Author:

MAINE UNIV AT ORONO DEPT OF MECHANICAL ENGINEERING

Report Date:

2008-06-01

Pagination or Media Count:

160.0

Abstract:

This report summanzes research on the design and fatigue analysis of laser-stake welded connections performed at the University of Maine from January 2006 to December 2007 for the Structural Response of Hybrid Ship Connections Subjected to Fatigue Loads HSCF project. Laser welding is a maturing technology that can be used to fabricate metalcomposite hybrid connections wherein modular composite panels with embedded steel inserts are welded to a steel ship hull. The static and fatigue response of continuous laser welded steel connections for ship structures has been analyzed using finite element techniques. The stress analyses, which are based on the principles of linear elastic fracture mechanics, will enable engineers to design robust laser welded lap joints for prescribed loads. It is found that the overlap length. weld width and plate thicknesses play a major role in determining joint strength under different loading conditions. The fatigue response of laser welded lap joints is also investigated for different weld geometries and loading conditions using a fracture specific finite element program FRANC2D. It is found that the weld width has a significant effect on the crack trajectory and fatigue life of the joint.

Subject Categories:

  • Fabrication Metallurgy
  • Structural Engineering and Building Technology
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE