• 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 ...
    • Fused Deposition of Ceramics: Progress Towards a Robust and Controlled Process for Commercialization 

      Clancy, R.; Jamalabad, V.; Whalen, P.; Bhargava, P.; Dai, C.; Rangarajan, S.; Wu, S.; Danforth, S.; Langrana, N.; Safari, A. (1997)
      The feasibility of using the Fused Deposition ofCeramics (FDC) process to rapidly fabricate functional quality advanced ceramic components has been demonstratedl - 5 . This direct manufacturing technique, by eliminating ...
    • Thermal Analysis Of Fused Deposition 

      AtifYardimci, M.; Hattori, Takeshi; Guceri, Selcuk I.; Danforth, Stephen C. (1997)
      Fused Deposition processes involve successive melting, extrusion and solidification of thermoplastic polymer melts. Fluid mechanics and heat transfer of neat or particle-filled polymeric melts, viscoelastic deformation ...
    • High Pressure, Convectively-Enhanced Laser Chemical Vapor Deposition of Titanium 

      Maxwell, James; Krishnan, Ramnath; Haridas, Suresh (1997)
      Laser chemical vapor deposition is a freeform technique that can generate three-dimensional structures from organometallic or metal halide precursors. To obtain enhanced growth rates, a novel high pressure reactor has ...
    • Optimising Build Parameters and Hatch Style for Part Accuracy in Stereolithography 

      ONUH, S.O.; HON, K.K.B. (1997)
      A detailed study of the effects of layer thickness, hatch spacing, hatch overcure depth, and hatch fill cure depth on the quality of the StereoLithography (SL) product was carried out using acrylic based resin. Taguchi ...
    • Empirical Similitude Method for the Functional Test with Rapid Prototypes 

      Cho, Uichung; Wood, Kristin (1997)
      Rapid prototyping has the potential to improve the performance of the design process both in cycle time and resources. Such improvements may be realized through the timely visual, ergonomic, and functional information ...
    • Deflection and the Prevention ofIngress within Laminated Tooling for Pressure DieCasting 

      Soar, R.C.; Dickens, P.M. (1997)
      Wrthin the context ofrapid tooling, we are currently assessing the fundamental limitations oflaminated tooling for pressure die-casting (PDC) applications. The use ofindividual laminates to form a die-cast tool presents ...
    • Processing of Novel Piezoelectric Transducers Via SFF 

      Safari, A.; Danforth, S. C.; Panda, R. K.; McNulty, T. F.; Mohammadi, F.; Bandyopadhyay, A. (1997)
      Piezoelectric ceramics and ceramic/polYmer composites exhibiting conventional and novel designs were fabricated using Solid Freeform Fabrication (SFF) techniques. SFF is used to develop and optimize numerous transducer ...
    • Reaction Heat Effect On Initial Linear Shrinkage of Sterelothigraphy Resins 

      NARAHARA, Hiroyuki; TANAKA, Fumiki; KISHINAMI, Takeshi; IGARASHI, Satoru; SAITO, Katsumasa (1997)
      In the industrial use ofthe Stereolithography, the precision is always a problem. Basic phenomenon of the solidification shrink has not suffiCiently investigated This study aims at clarifying the initial linear shrinkage ...
    • Net shape Functional Parts Using Diode Laser 

      Manzur, Tariq; Roychoudhuri, Chandra; Dua, Puneit; Hossain, Fahmida; Marcus, Harris (1997)
      Manufacturing processes, such as cutting, drilling, soldering, marking, forming 3Dsintered parts from metal powders and laser vapor deposition, are now well established practices using matured high power lasers like ...
    • Gas Phase SFF Control System for Silicon Nitride Deposition by SALD/SALDV 

      Harrison, Shay; Costa, Chris F.; Jakubenas, Kevin J.; Crocker, James E.; Marcus, Harris L. (1997)
      : A closed-loop laser scanning and temperature control system has been developed for SALD/SALDVI. Temperature control is especially important in SALD/SALDVI because temperature plays a defining role in both composition ...
    • Fabrication ofIn-situ SiC/C Thermocouples by Selective Area Laser Deposition 

      Sun, Lianchao; Jakubenas, Kevin J.; Crocker, James E.; Harrison, Shay; Shaw, Leon L.; Marcus, Harris L. (1997)
      With the intrinsic nature to process relatively small features, selective area laser deposition (SALD) is a potential technique to fabricate complex shaped macro-components with in-situ high-resolution micro-devices. In ...
    • A data format providing side wall orientation and adaptive slicing for use in stepless rapid prototyping 

      Fang, Wei; Siang Ngooi, Chan; Gong, Haiqing (1997)
      Current Rapid Prototyping systems mainly use 2D layers building techniques that result in the 'staircase' effect on slanted surface. A new method has been developed to eliminate the 'staircase' effect and to improve the ...
    • Solid Model Creation for Materially Graded Objects 

      Kumar, Vinod; Dutta, Debasish (1997)
      Materially graded objects are objects composed of different constituent materials and could exhibit continuously varying composition and/or microstructure [1][2]. Such continuous changes results in gradation in their ...
    • Net Shape Composites Using SLA Tetracast Patterns 

      Gervasi, Vito R. (1997)
      Net-shape composites have been a focus of Solid Freeform Fabrication (SFF) for a number of years. A new method to achieve net-shape composites uses hollow Stereolithography (SLA) TetraCast* patterns. The TetraCast* ...
    • Reverse Engineering: Algebraic Boundary Representations to Constructive Solid Geometry 

      Buchele, S. F.; Ellingson, W. A. (1997)
      Recent advances in reverse engineering have focused on recovering a boundary representation (b-rep) of an object, often for integration with rapid prototyping. This boundary representation may be a 3-D point cloud, a ...
    • Validation ofRapid Prototyping Material for Rapid Experimental Stress Analysis 

      Schley, C.; Smith, G.F. (1997)
      The paper will detail the validation work carried out on various Rapid Prototyping (RP) materials to determine their suitability for the application of Thermoelastic Stress Analysis. The overall objective is to drastically ...
    • 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 ...