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Digitale Medien

Characterisation of Epoxy Resins for Microstereolithographic Rapid Prototyping (1999)

Chatwin, C. R. ; Farsari, M. ; Huang, S. ; [weitere]

Springer

The international journal of advanced manufacturing technology 15 (1999), S. 281-286

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ISSN: 1433-3015

Schlagwort(e): Key words.Diffractive optics; Four-wave mixing; Microstereo-lithography; Optoelectronics; Photochemistry

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Two epoxy resins are investigated using non-degenerate fourwave mixing. The materials assessed are optimised for use with a UV argon-ion laser. The holographic gratings were written at a wavelength of l= 351.1 nm for an irradiance range 0.5–3.0 W/cm 2 and read at l= 632.8 nm in order to compare the reactivity, curing speed, shrinkage and resolution of the resins. These experiments were carried out to prove the suitability of the photopolymerisation systems for use with a new microstereolithographic technique. This new technique exploits a spatial light modulator to create 3D components using a completely planer, layer-by-layer, process of exposure which is described herein. With this procedure it is possible to build components with dimensions in the range of 50 mm to 50 μm, and feature sizes as small as 5 μm with a resolution of 1 μm.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s001700050067

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Digitale Medien

A more accurate FD solution for the 3D non-linear heat equation (1995)

Zerroukat, M. ; Chatwin, C. R.

Chichester : Wiley-Blackwell

Communications in Numerical Methods in Engineering 11 (1995), S. 535-544

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ISSN: 1069-8299

Schlagwort(e): partial differential equations ; heat equation ; finite differences ; Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: The paper presents a new finite difference solution for the 3D non-linear heat equation. This solution is based on the approach of making finite difference substitutions into the solution of the partial differential equation, rather than into the partial differential equation itself, which is the classical approach. Numerical results show that the new FD equation is approximately ten times more accurate than the classical solutions.

Zusätzliches Material: 3 Tab.