• Trussed Structures: FreeForm Fabrication without the Layers 

      Pegna, Joseph; Messia, David; Lee, Woo Ho (199)
      Recent progress in 3D-LCVD have demonstrated the advantages ofrod micro-fabrication, both from the point of view of the range of volumetric deposition rates -from 1cl- to 109 cubic micron per second- andfrom the point ...
    • Liquid Metal Jetting for Printing Metal Parts 

      Cesarano TI, Joseph; Baer, Thomas A.; Calvert, Paul (1997)
      Liquid Metal Jetting (LMJ) is solid freeform fabrication process for producing metal mechanical parts and electronic interconnects. It is a technology similar to ink jet printing where individual molten droplets are ...
    • Measurement of Residual Stresses in Parts Created by Shape Deposition Manufacturing 

      Klingbeil, N.W.; Zinn, J.W.; Beuth, J.L. (1997)
      Residual stress build-up is a concern in any solid freeform fabrication process involving successive deposition of uncured or molten material, due to differential contractions caused by solidification or curing. The most ...
    • SLS Processing of Functionally Gradient Materials 

      Jepson, L.; Beaman, J. J.; Bourell, D. L.; Wood, K. L. (1997)
      A developing SLS process, known as Multiple Material Selective Laser Sintering, will allow the material composition of a component to be varied in a controlled manner. This process could allow the fabrication of functionally ...
    • Progress on Tooling by 3D Printing; Conformal Cooling, Dimensional Control, Surface Finish and Hardness 

      Sachs, Emanuel; Allen, Samuel; Guo, Honglin; Banos, Javier; Cima, Michael; Serdy, James; Brancazio, David (1997)
      Three Dimensional Printing is being applied to the direct fabrication of tooling using metal powders. This paper presents progress updates in four areas: i) thermal management using conformal cooling and related work on ...
    • Laser Aided Direct Rapid Prototyping 

      Franceschini, Robert; Napravnik, Lee; Mukherjee, Amar; Sankaranarayanan, Srikanth; Kar, Aravinda (1997)
      We describe a multilevel design hierarchy applicable to the VLSI-like layered manufacturing technology of Solid Freeform Fabrication (SFF) called Laser Aided Direct Rapid Prototyping (LADRP). We discuss the interfaces between ...
    • Thermal Effects on Accuracy in the 3DKeltool™ Process 

      Hopkinson, Neil; Dickens, Phill (1997)
      The 3DKeltool™ process has been used to produce injection moulding inserts capable ofproducing millions ofparts with quick cycle times (1). Short lead times are possible however accuracy is reduced for dimensions over ...
    • A Thermal Model For Laminated Object Manufacturing (LOM) 

      Flach, Lawrance; Klostennan, Donald A.; Chartoff, Richard P. (1997)
      A thennal model for Laminated Object Manufacturing (LOM) has been developed. The model is based on 3-dimensional transient heat conduction in a rectangular geometry LOM part. Heat transfer from the heated roller to the ...
    • Silica Filled Resins for Rapid SLA Tools 

      Taft, Douglas; Ogale, Amod; Paul, Frank; Hunt, Elaine; Ahzi, Said (1997)
      A stable silica /SL epoxy resin suspension has been developed at Clemson University. It has been processed to make parts in a commercial StereoLithography Apparatus (SLA). Results oftesting show that the composite material ...
    • Low-cost Machine Vision Monitoring of the SLS Process 

      Gibson, Ian; Ming, Ling Wai (1997)
      During the building of a part using SLS, it is common practice to adjust the temperature parameters. It is important to control these parameters because ifthey are too high then part breakout is difficult. Ifthey are too ...
    • Simulation Of Coarsening During Laser Engineered Net Shaping 

      Tikare, Veena; Griffith, Michelle; Schlienger, Eric; Smugeresky, John (1997)
      Laser Engineered Net_Shaping, otherwise known as LENSTM, is an advanced manufacturing technique used to fabricate complex near net shaped components directly from engineering solid models without the use of dies or ...
    • The Design and Construction of a Medical System to Optimize the Endoscopic Ultrasound Procedure 

      Daruwala, Darius P.; Johnson, Christopher M.; Jacobsen, Donald R. (1997)
      This project involved the use ofrapid prototyping to produce a model of a section ofthe gastrointestinal (GI) tract which could be used for practice ofthe Endoscopic Ultrasound (EUS) procedure. Computed Tomography (CT) ...
    • Extrusion Freeforming ofNylon 6 Materials 

      Lombardi, John L.; Calvert, Paul D. (1997)
      Numerous commercial rapid prototyping (RP) processes are capable offabricating complex shaped components. These processes build prototypes "from the ground up" by first reducing a CAD design ofthe desired prototype to a ...
    • Direct SLS of powder compositions used for self-propagating high-temPerature synthesis. 

      Shishkovsky, IV.; Makarenko, A.G.; Petrov, A.L (1997)
      The conditions of a direct selective laser sintering (SLS) were resea;rched experimental in a volume and by layers for the eutectic and near-eutectic powder compositions, which usually used for the self-propagating ...
    • Extrusion Freeform Fabrication of Bone-Like Mineralized Hydrogels and Muscle-like Actuators 

      Zengshe, Liu Paul, Calvert (1997)
      Extrusion freeform fabrication has been used to build shapes from agarose, polyacrylamide and polyacrylic acid hydrogels. Contraction and bending can be induced by pH change or application ofa voltage between embedded ...
    • Pre-LOM, LOM, and Post-LOM Processes for the Fabrication of SiC and SiC/SiC Components 

      Klosterman, Don; Chartoff, Richard; Osborne, Nora; Graves, George; Lightman, Allan; Steidlel, Cheri (1997)
    • Pre-LOM, LOM, and Post-LOM Processes for the Fabrication of SiC and SiC/SiC Components 

      Klosterman, Don; Chartoff, Richard; Osborne, Nora; Graves, George; Lightman, Allan; Steidle, Cheri (1997)
    • Shrinkage, Weight Loss and Crack Prevention During Binder Burn Out of Components Produced" by Fused Deposition of Ceramics (FDC) 

      Bhargava, P.; Bandyopadhyay, A.; Rangarajan, S.; Qi, G.; Dai, C.; Wu, S.; Danforth, S.; Safari, A. (1997)
      In the present study the sequential stages ofthe previously established binder bum out (BBO) route were characterized by obtaining precise shrinkage and weight loss measurements from interrupted runs. A DoE (Design of ...
    • Statistical Process Control For Solid Freeform Fabricatin Processes 

      Gervasi, Vito R. (1997)
      Statistical prpcess control (SPC) has not been widely used for solid freeform fabrication (SFF) pr~cesses, primarily due to the wide diversity ofgeometries in builds. In addition, typical parts created on SFF platforms are ...
    • Modeling of Mechanical Behavior of SLA Parts 

      Wu, Zhanping; Ogale, Amod A.; Ahzi, Said; Paul, Frank W.; Hunt, Elaine (1997)
      In recent years, important efforts have been focused on producing functional parts using Stereolithography Apparatus ( SLA ). One of the applications is the development of rapid polymer tooling such as dies for injection ...