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Objectives of this investigation were to investigate regions of high cycle and threshold fatigue crack propagation and to correlate the findings with observed results from tests of welded structural details.

A finite volume numerical method is introduced to perform the direct numerical simulation for two-phase immiscible and incompressible fluids. The Navier-Stokes equation is discretized by the staggered mesh spatially and advected temporally with the 4th order Runge-Kutta scheme. CFL conditions involving the effect from the convective term, viscous term, stiff source term and heat transfer are applied to meet the stringent limitation on the time step. Energy equation is coupled with the Navier-Stokes equation when the study of heat transfer is included.

A recently developed connection for structural tubing utilizes hollow steel spheres at the junctions of the tubes. This report presents the results of an experimental investigation of these joints.

This paper summarizes the results of tension tests of two large structural shingle joints of A572 steel. One joint was fastened with A325 bolts and the other with A502 Gr. 1 rivets. A theoretical analysis of the load partition is also described.