A methodology to evaluate the influence of part geometry on residual stresses in selective laser melting
Date
2016
Journal Title
Journal ISSN
Volume Title
Publisher
Faculty of Engineering, Department of Industrial Engineering, Stellenbosch University
Abstract
ENGLISH ABSTRACT: The subject of residual stresses induced by the Selective Laser Melting (SLM) process has been one of the main focus areas in literature over the past decade. It has been reported that residual stresses can be responsible for shape and dimensional distortions, cracking and compromised mechanical properties (reduced yield and fatigue strength). These shortfalls limit the applicability of SLM components in industry, particularly for the aerospace industry where part lifetime and hence fatigue life is of utmost concern. High temperature gradients have been reported to be responsible for the residual stress build up. A key aspect that has not been considered in literature is part geometry and orientation and its influence on residual stress levels. Thus, this study proposes a methodology for investigating this influence for different geometric features. In this work, samples were built from tool steel powders. The Hole Drilling Method (HDM) and X-Ray Diffraction (XRD) techniques are proposed for measuring residual stresses. Preliminary results show that the geometry of a part influences residual stress magnitudes and distributions, with sharper ends exhibiting higher stresses than less sharp specimen ends.
AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar
AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar
Description
CITATION: Mugwagwa, L., et al. 2016. A methodology to evaluate the influence of part geometry on residual stresses in selective laser melting. In Competitive Manufacturing, International Conference on Competitive Manufacturing (COMA '16), 27-29 January 2016, Stellenbosch, Stellenbosch University, South Africa.
The original publication is available at http://conferences.sun.ac.za/index.php/doie/coma16
The original publication is available at http://conferences.sun.ac.za/index.php/doie/coma16
Keywords
Selective laser melting, Residual stresses, Geometrical constructions, Residual stress measurement
Citation
Mugwagwa, L., et al. 2016. A methodology to evaluate the influence of part geometry on residual stresses in selective laser melting. In Competitive Manufacturing, International Conference on Competitive Manufacturing (COMA '16), 27-29 January 2016, Stellenbosch, Stellenbosch University, South Africa