1995 / Solid Freeform Fabrication Proceedings
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Author R.K. Chin, J.L. Beuth, C.H. Amon, Carnegie Mellon University
Source Solid Freeform Fabrication Proceedings, 1995, pp 221-228
Abstract Layer-level thermal and mechanical modeling of the microcasting stage of Shape Deposition Manufacturing is presented. Thermo-mechanical models of carbon steel deposited onto a carbon steel substrate are described. Mechanics modeling addresses the issue of residual stress build-up. The effects of substrate heating and bending constraint on the build-up of residual stresses are shown. Results show that thermal cycling from newly applied droplets drastically changes the stress state in the top of the substrate. Originally unstressed regions go through an inelastic compression-tension stress cycle. Residual stresses reach values that may cause yielding in carbon steel. Moderate heating of the substrate above room temperature prior to droplet deposition reduces stresses significantly. Bending constraint during part manufacture allows partial relaxation of stresses as the constraint is removed. (Auth abstract) [References: 7]
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
or contact:
The University of Texas at Austin
Laboratory for Freeform Fabrication / Texas Materials Institute
Mechanical Engineering Dept.
c/o The Solid Freeform Fabrication Symposium
MC C2200
Austin, TX 78712-1063 USA
512-471-3026; 512-471-7681 FX; Email: sffsymp@uts.cc.utexas.edu