Crack monitoring and failure investigation on inkjet printed sandwich structures under quasi-static indentation test

In this research contribution, effort is taken to monitor the crack initiation and crack propagation of three-dimensional (3D) printed corrugated sandwich structures using acoustic emission technique. Vertical pillars were introduced in between the existing sinusoidal wave-like corrugations to impro...

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Main Authors: Dikshit, Vishwesh, Nagalingam, Arun Prasanth, Yap, Yee Ling, Sing, Swee Leong, Yeong, Wai Yee, Wei, Jun
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/87634
http://hdl.handle.net/10220/44493
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-876342020-03-07T12:47:08Z Crack monitoring and failure investigation on inkjet printed sandwich structures under quasi-static indentation test Dikshit, Vishwesh Nagalingam, Arun Prasanth Yap, Yee Ling Sing, Swee Leong Yeong, Wai Yee Wei, Jun School of Mechanical and Aerospace Engineering A*STAR SIMTech Singapore Centre for 3D Printing Quasi-static Indentation 3D Printing In this research contribution, effort is taken to monitor the crack initiation and crack propagation of three-dimensional (3D) printed corrugated sandwich structures using acoustic emission technique. Vertical pillars were introduced in between the existing sinusoidal wave-like corrugations to improve the load bearing capacity of these structures. The vertical pillared corrugated structures were 3D printed with single and multi-material combinations in the facesheet and tested for their indentation resistance. To monitor the exact invisible crack initiation and crack propagation in the 3D printed corrugated structures, a highly-sensitive acoustic emission (AE) testing method was introduced. The resulting AE data points during testing illustrated a cluster of low amplitude data points from 40 to 65 dB indicating invisible crack initiations. High amplitude points up to 95 dB indicated visible cracks propagating until the end of specimen failure. Prevalent failure mechanism for single material (type A) specimens was found to be shear cracking of facesheets with micro steps and failure mechanism of multimaterial (type B) specimens were found to be delamination and shear cracking of multimaterial layers. Load bearing capacity was maximum at 2.14 ± 0.3 kN for type A specimens under a flat indenter with a displacement of 2.12 ± 0.4 mm. ASTAR (Agency for Sci., Tech. and Research, S’pore) 2018-03-05T03:51:49Z 2019-12-06T16:46:06Z 2018-03-05T03:51:49Z 2019-12-06T16:46:06Z 2018 2017 Journal Article Dikshit, V., Nagalingam, A. P., Yap, Y. L., Sing, S. L., Yeong, W. Y., & Wei, J. (2018). Crack monitoring and failure investigation on inkjet printed sandwich structures under quasi-static indentation test. Materials and Design, 137, 140-151. 0264-1275 https://hdl.handle.net/10356/87634 http://hdl.handle.net/10220/44493 10.1016/j.matdes.2017.10.014 203456 en Materials and Design © 2017 Elsevier.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Quasi-static Indentation
3D Printing
spellingShingle Quasi-static Indentation
3D Printing
Dikshit, Vishwesh
Nagalingam, Arun Prasanth
Yap, Yee Ling
Sing, Swee Leong
Yeong, Wai Yee
Wei, Jun
Crack monitoring and failure investigation on inkjet printed sandwich structures under quasi-static indentation test
description In this research contribution, effort is taken to monitor the crack initiation and crack propagation of three-dimensional (3D) printed corrugated sandwich structures using acoustic emission technique. Vertical pillars were introduced in between the existing sinusoidal wave-like corrugations to improve the load bearing capacity of these structures. The vertical pillared corrugated structures were 3D printed with single and multi-material combinations in the facesheet and tested for their indentation resistance. To monitor the exact invisible crack initiation and crack propagation in the 3D printed corrugated structures, a highly-sensitive acoustic emission (AE) testing method was introduced. The resulting AE data points during testing illustrated a cluster of low amplitude data points from 40 to 65 dB indicating invisible crack initiations. High amplitude points up to 95 dB indicated visible cracks propagating until the end of specimen failure. Prevalent failure mechanism for single material (type A) specimens was found to be shear cracking of facesheets with micro steps and failure mechanism of multimaterial (type B) specimens were found to be delamination and shear cracking of multimaterial layers. Load bearing capacity was maximum at 2.14 ± 0.3 kN for type A specimens under a flat indenter with a displacement of 2.12 ± 0.4 mm.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Dikshit, Vishwesh
Nagalingam, Arun Prasanth
Yap, Yee Ling
Sing, Swee Leong
Yeong, Wai Yee
Wei, Jun
format Article
author Dikshit, Vishwesh
Nagalingam, Arun Prasanth
Yap, Yee Ling
Sing, Swee Leong
Yeong, Wai Yee
Wei, Jun
author_sort Dikshit, Vishwesh
title Crack monitoring and failure investigation on inkjet printed sandwich structures under quasi-static indentation test
title_short Crack monitoring and failure investigation on inkjet printed sandwich structures under quasi-static indentation test
title_full Crack monitoring and failure investigation on inkjet printed sandwich structures under quasi-static indentation test
title_fullStr Crack monitoring and failure investigation on inkjet printed sandwich structures under quasi-static indentation test
title_full_unstemmed Crack monitoring and failure investigation on inkjet printed sandwich structures under quasi-static indentation test
title_sort crack monitoring and failure investigation on inkjet printed sandwich structures under quasi-static indentation test
publishDate 2018
url https://hdl.handle.net/10356/87634
http://hdl.handle.net/10220/44493
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