Characterization of Deformation and Failure of Stainless Steel Welds
Final rept. 1 Jun 1996-30 Sep 2004
BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
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Kolsky bar experiments have been used to determine the high-strain-rate response of AL6XN welds - including the base material, the heat-affected zone, and the weld. A finite element model for analyzing ductile fracture near the weld as been developed and implemented as a material routine VUMAT in ABAQUSExplicit. The FE model involves a Gurson-type constitutive description for porous materials, combined with a microstructural length scale and an upper pound approach for modeling the onset and evolution of void coalescence. This model appears to provide a promising description of dynamic failure of butt-welded stainless steel plates. In a second investigation, pressure-shear plate impact experiments have been used to determine the shearing resistance of an epoxy and two vinyl esters at strain rates of 100,000sec. This shearing resistance has been shown to increase significantly with increasing pressure.
- Metallurgy and Metallography
- Fabrication Metallurgy
- Couplers, Fasteners and Joints