• Product Model Driven Direct Manufacturing 

      Carleberg, Per (1994)
      The input to the freeform fabrication process is essentially geometric data, raw material, material data and process parameters. Optimal process parameters depend upon current material and the part geometry. This paper ...
    • Production of Metal Protoypes Using a High Powered Laser Machining Centre 

      Pridham, M.S.; Thomson, G.A.; Menon, U; Koch, M (1994)
      The established commercially available rapid prototyping techniques are now well known throughout the manufacturing community. They are able to produce high quality, accurate prototypes, but are limited largely to ...
    • QuickCast™ & Rapid Tooling: A Case History at Ford Motor Company 

      Denton, Karl R.; Jacobs, Paul F. (1994)
    • Rapid Prototyping: A Global View 

      Campbell, R.I.; Dickens, P.M. (1994)
      Rapid prototyping technology is advancing at a tremendous rate. Much of this progress is due to research being conducted within academic institutions and industry throughout the world. The USA is leading the research ...
    • Reducing Warpage In Sterelothiography Through Novel Draw Styles 

      Ullett, Jill S.; Chartoff, Richard P.; Lightman, Allan J.; Murphy, John P.; Li, Jinghong (1994)
      A consistent problem with stereolithography has been part distortion and dimensional inaccuracies caused by resin shrinkage. Resin shrinkage and, thus, warpage occurs during the build process and during the postcure. ...
    • Selective Laser Pyrolysis for Solid Free-FonTI Fabrication of Silicon Carbide 

      Jakubenas, K.; Marcus, H.L. (1994)
      Selective laser pYrolysis rapidly decomposes a polymeric precursor to form a cohesive ceramic shape. The considerable shrinkage and porosity during pYrolysis of pure precursor can be modified by the addition of either ...
    • Selective Laser Sintering of Alumina-Boron Oxide Composites 

      Lee, Insup; Manthiram, A.; Marcus, H.L (1994)
      The selection of an optimum composite system for selective laser sintering (SLS) is based on materials properties such as the melting point and the wettability between the components in the composite powder. The alumina-boron ...
    • Selective Laser Sintering of Calcium Phosphate Powders 

      Lee, Gonhee; Barlow, J.W. (1994)
      Since Dejong first observed the similarity between powder X - ray diffraction pattern ofthe in vivo mineral and the hydroxyapatite (Cas(OH)(P04h ,HA) in 1926, the calcium phosphate ceramics have received attention as a ...
    • Selective Laser Sintering of Polycarbonate at Varying Powers, Scan Speeds and Scan Spacings 

      Childs, T.H.C.; Cardie, S.; Brown, J.M. (1994)
      A benchmark study (1) has shown selective laser sintering to be the equal of or to have accuracy advantages over other processes for creating parts of size over 10 mm. Experience is needed to achieve best accuracies, as ...
    • Shape and Topology Structural Redesign by Large Perturbations 

      Bernitsas, Michael M.; Suryatama, Danet; Byungsik, Kang; Dale, G. Karr (1994)
      The ultimate goal in concurrent engineering of structures is to achieve simultaneously in the design stage the following objectives: (1) A shape that performs itsfunction, conforms with the boundary conditions,and can ...
    • Shape Deposition Manufacturing 

      Merz, R.; Prinz, F.B.; Ramaswami, K.; Terk, M.; Weiss, L.E. (1994)
      One challenge for solid freeform fabrication has been to develop the capability to directly create functional metal shapes which are dense, metallurgically bonded, geometrically accurate and with good surface appearance. ...
    • Silicon Carbide Shapes By Selected Area Laser Deposition Vapor Infiltration 

      Birmingham, B.R.; Tompkins, J.V.; Marcus, H.L. (1994)
      Selected Area Laser Deposition Vapor Infiltration (SALDVI) is a unique combination ofselected area laser deposition, chemical vapor infiltration and layered powder handling techniques that can be used to fabricate silicon ...
    • A Simple Polymer Shrinkage Model Applied to Stereolithography 

      Flach, Lawrance; Chartoff, Richard P. (1994)
      A simple polymer shrinkage model has been successfully applied to the stereolithography process. The shrinkage model, which computes specific volume changes from the degree of conversion of monomer to polymer, incorporates ...
    • SLSTM Prototypes From Nylon 

      Forderhase, Paul; McAlea, Kevin; Michalewicz, Mary; Ganninger, Mark; Firestone, Kent (1994)
      Many rapid prototypmg materials and processes produce parts which have relatively low stiffness, strength, and ductility. While such parts are useful for visualization, they have limited value where functional features ...
    • Solid Freeform Fabrication of Functional Ceramic Components Using a Laminated Object Manufacturing Technique 

      Griffin, Curtis; Daufenbach, JoDee; McMillin, Scott (1994)
      Lone Peak Engineering (LPE) has demonstrated the feasibility ofusing solid freeform fabrication to prepare advanced structural ceramics using a laminated object manufacturing (LOM) technique. High purity, high density ...
    • Sprayed Metal Shells for Tooling: Improving the Mechanical Properties 

      Fussell, P.S.; Kirchner, H.O.K.; Prinz, F.B. (1994)
      Tbis work describes methods to improve the quality of the metal resulting from thermal spray deposition, including both the mechanical and metallurgical behavior. The engineering context is the production of sprayed metal ...
    • Stereolithography Epoxy Resins SL 5170 and SL 5180: Accuracy, Dimensional Stability, and Mechanical Properties 

      Pang, Thomas H. (1994)
      Stereolithography (SL) resins based on epoxy chemistry provide significantly improved overall part accuracy, dimensional stability, and mechanical properties relative to the earlier acrylate SL resins. In July, 1993, ...
    • Structural Design for Freeform Fabrication using Composite Materials 

      Johanson, Roy; Kikuchi, Noboru; Papalambros, Panos (1994)
      Advances in the development of methods to Perform topology optimization offer the ability to design novel structures composed of dense composite materials. These structures, which possess superior mechanical proPerties, ...
    • Studies in Stereolithography : Influence of Process Parameters on Curl Distortion in Photopolymer Models 

      Jayanthi, Suresh; Keefe, Michael; Gargiulo, Edward P. (1994)
      To make the stereolithography process more useful in the manufacturing industry, the dimensional accuracy of the parts it creates should be very high. But due to the nature of the polymerization process and the mechanism ...
    • Surface Texture by 3D Printing 

      Sachs, Emanuel; Curodeau, Alain; Gossard, David; Jee, Haeseong; Cima, Michael; Caldarise, Salvatore (1994)
      Three Dimensional Printing is a solid freeform fabrication process which creates parts directly from a computer model by depositing in layers. Each layer is created by depositing powder and selectively joining the powder ...