Online from: 1995
Subject Area: Mechanical & Materials Engineering
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|Title:||A study of the staircase effect induced by material shrinkage in rapid prototyping|
|Author(s):||Hong Wenbin, (School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore), Lee Yong Tsui, (School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore), Gong Haiqing, (School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore)|
|Citation:||Hong Wenbin, Lee Yong Tsui, Gong Haiqing, (2005) "A study of the staircase effect induced by material shrinkage in rapid prototyping", Rapid Prototyping Journal, Vol. 11 Iss: 2, pp.82 - 89|
|Keywords:||Accuracy, Rapid prototypes, Simulation, Ultraviolet radiation|
|Article type:||Research paper|
|DOI:||10.1108/13552540510589449 (Permanent URL)|
|Publisher:||Emerald Group Publishing Limited|
Purpose – To investigate the “staircase effect”, which is one of the most significant manifestations of part inaccuracy in liquid-based rapid prototyping (RP) processes, on multi-layer RP parts made using a thick layer deposition and photo-curing process in a stepless rapid prototyping (SRP) system.
Design/methodology/approach – The building of a five-layer part is simulated layer by layer using a finite element method based on an incremental elastic model, to analyze the staircase effect due to shrinkage induced by polymerization and temperature variation. The influence of various factors such as layer thickness and intensity of incident UV light is studied. The results were verified experimentally.
Findings – Results show that the staircase amount increases 20 percent and 300 percent with light intensity increasing from 65 to 145?mW/cm2 and layer thickness increasing from 0.2 to 2.0?mm, respectively. It is also found that the overall staircase is below 100?
Research limitations/implications – The results apply only to the material used in the work: an acrylate-based photopolymer resin, C123, produced by Tianjin Chemical Co., China. Also, the thickness of the layers is fixed at 6?mm.
Practical implications – Provides a method to analyze the origin and amount of the staircase effect, upon which to better control the surface finish of RP parts. New materials and different layer thicknesses can be investigated using the same method.
Originality/value – Apart from the above practical implication, this paper establishes the parameters that influence the shrinkage of the material used in SRP.
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