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


Personal Author(s) : Singh, Anshuman ; Vel, Senthil S ; Caccese, Vincent


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a484696.pdf


Report Date : Jun 2008


Pagination or Media Count : 160


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 metal/composite 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.


Descriptors :   *STRENGTH(MECHANICS) , *LASER WELDING , *FATIGUE(MECHANICS) , *COMPOSITE STRUCTURES , ELASTIC PROPERTIES , MODULAR CONSTRUCTION , STEEL , FRACTURE(MECHANICS) , WELDS , STRUCTURAL RESPONSE , EMBEDDING , ENGINEERS , UNIVERSITIES , TRAJECTORIES , SHIP HULLS , WELDED JOINTS , HULLS(STRUCTURES) , SHIP STRUCTURAL COMPONENTS , CRACKS , LOADS(FORCES) , MAINE , STRESS ANALYSIS , FINITE ELEMENT ANALYSIS


Subject Categories : Fabrication Metallurgy
      Structural Engineering and Building Technology
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE