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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

Derivatives and their error bounds in second order problems by finite element (1976)

Mote, C. D. ; Young, R. C.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 10 (1976), S. 1065-1075

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ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: A previous paper by the authors presented a finite element technique for computing accurate and bounded solutions at arbitrary points in second order mixed boundary value problems. The technique is extended herein to the computation of accurate and bounded derivatives at arbitrary interior points. Numerical results are presented to illustrate both the strengths and limitations to the method.

Zusätzliches Material: 4 Ill.