Experimental Investigations for Fabrication and Comparison of Fatigue Properties of an Open Cell Porous Regular Metallic Structure and with Inner Solid Core through Rapid Manufacturing

Abstract:

In this study parts having Open Cell Porous Regular Interconnected Metallic Structure (OCPRIMS) of cubic unit cell and OCPRIMS with inner solid core were fabricated through developed process of Rapid Manufacturing (RM) process. Two approaches were used to fabricate inner solid core i,e one by using metallic phosphor bronze powder and other by using solid phosphor bronze rod. The specimens were fabricated in accordance with ISO 3928: 1999 and subjected to tension-tension and compressive-compressive fatigue testing. The endurance limit of OCPRIMS with solid rod cored structure was found to be on the higher side in comparison to other types of specimens. The results of Scanning Electron Microscopy (SEM) and images of fractured surfaces showed the presence of voids, shrinkage cavities and pointed edges on the designed pores. They acted as stress raisers and facilitated crack initiation and propagation in the specimens.

• Periodical: Advanced Materials Research (Volume 1137)
• Pages: 52-60
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1137.52
• Online since: June 2016
• Authors: Jatender Pal Singh*, Pulak M. Pandey
• Keywords: 3-D Printing, Crack, Fatigue, Metallic, Porous, Pressureless, Shrinkage, Sintering, Voids

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