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Materials 2017, 10(3), 290; doi:10.3390/ma10030290

Investigation of Quasi-Static Indentation Response of Inkjet Printed Sandwich Structures under Various Indenter Geometries

1
Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
2
Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore
*
Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Received: 25 December 2016 / Revised: 2 March 2017 / Accepted: 5 March 2017 / Published: 14 March 2017
(This article belongs to the Special Issue The Brittle Failure of Different Materials)

Abstract

The objective of this investigation was to determine the quasi-static indentation response and failure mode in three-dimensional (3D) printed trapezoidal core structures, and to characterize the energy absorbed by the structures. In this work, the trapezoidal sandwich structure was designed in the following two ways. Firstly, the trapezoidal core along with its facesheet was 3D printed as a single element comprising a single material for both core and facesheet (type A); Secondly, the trapezoidal core along with facesheet was 3D printed, but with variation in facesheet materials (type B). Quasi-static indentation was carried out using three different indenters, namely standard hemispherical, conical, and flat indenters. Acoustic emission (AE) technique was used to capture brittle cracking in the specimens during indentation. The major failure modes were found to be brittle failure and quasi-brittle fractures. The measured indentation energy was at a maximum when using a conical indenter at 9.40 J and 9.66 J and was at a minimum when using a hemispherical indenter at 6.87 J and 8.82 J for type A and type B series specimens respectively. The observed maximum indenter displacements at failure were the effect of material variations and composite configurations in the facesheet. View Full-Text
Keywords: three-dimensional (3D) printing; additive manufacturing; quasi-static indentation; brittle fracture; cracks; failure mechanism; energy absorption; sandwich structure; damage three-dimensional (3D) printing; additive manufacturing; quasi-static indentation; brittle fracture; cracks; failure mechanism; energy absorption; sandwich structure; damage
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Dikshit, V.; Nagalingam, A.P.; Yap, Y.L.; Sing, S.L.; Yeong, W.Y.; Wei, J. Investigation of Quasi-Static Indentation Response of Inkjet Printed Sandwich Structures under Various Indenter Geometries. Materials 2017, 10, 290.

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