• Benchmarking of Rapid Prototyping Systems - Beginning to Set Standards 

      Jayaram, Dureen; Bagchi, Amit; Jara-Almonte, C.C.; Oreilly, Sean (1994)
      Many rapid prototyping (RP) technologies are available today and more are being developed around the world. The absence of benchmarking standards in the RP industry has led manufacturers to use their own standards and ...
    • FDM® Technology Process Improvements 

      Comb, James; Priedeman, William; Turley, Patrick W. (1994)
      Since the introduction ofrapid prototyping technology as a tool for time compression and concurrent engineering in the design and manufacturing process, many enhancements and refinements have been made based on the ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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, ...
    • 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 ...
    • Histogram - Based Algorithm for Semiautomated Three-Dimensional Craniofacial Modeling 

      Levy, Richard A. (1994)
      Volume averaging artifacts in medical imaging result from voxel occupancy by more than one tissue type and, with anisotropic voxels, may be decreased by changing the imaging plane orientation relative to the target tissue ...
    • Multi-layered composites using photolithography 

      Bagchi, Amit; Beesley, Robert (1994)
      The mechanical properties of the parts made using solid freeform fabrication technologies are limited by their resins used. Previous research has shown that the mechanical properties of these parts can be enhanced ...
    • 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 ...
    • Ultraviolet Curing of Highly Loaded Ceramic Suspensions for Stereolithography of Ceramics 

      Halloran, John W.; Griffith, Michelle L. (1994)
      Ceramic green bodies can be created using stereolithography methods where a ceramic slip consisting of 45-55 vlo ceramic powder is dispersed within an ultraviolet-curable aqueous acrylamide solution. Two ceramic materials ...
    • Fundamentals of Liquid Phase Sintering Related to Selective Laser Sintering 

      Bunnell, D.E.; Bourell, D.L.; Marcus, H.L. (1994)
      Liquid phase sintering is one of the underlying principles that must be modeled and understood when the Selective Laser Sintering (SLS) process is used. This paper describes the initial studies being conducted to ...
    • Computer-derived microstructures by 3D Printing: Sio- and Structural Materials 

      Cima, M.J.; Sachs, E.; Cima, L.G.; Yoo, J.; Khanuja, S.; Borland, S.W.; Wu, B.; Giordano, R.A. (1994)
      3D Plinting is a rapid prototyping technique to manufacture functional components directly from computer models. The process involves spreading the powder in thin layers and then selective binding of the powder using a ...
    • 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 ...
    • 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. ...
    • Temperature-Controlled Selective Laser Sintering 

      Benda, J.A. (1994)
      A control scheme for laser sintering has been developed which maintains sintering powder at constant temperature by actively controlling laser power. It uses a sensor to monitor the temperature of powder at the focus of ...
    • 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 ...
    • 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 ...
    • Integration of Numerical Modeling and Laser Sintering with Investment Casting 

      Pintant, T; Sindel, M.; Greul, M.; Burblies, A.; Wiklening, C. (1994)
      Industry has a great demand for metallic prototypes to speed up product development. At present there are several RP-technologies for direct fabrication of metal components in development. Today secondary processing of ...
    • 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 ...