Delamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder Bed Fusion

Abstract Sandwich structures possess a high bending stiffness compared to monolithic structures with a similar weight. This makes them very suitable for lightweight applications, where high stiffness to weight ratios are needed. Most common manufacturing methods of sandwich structures involve adhesi...

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Autores principales:	M. Nuño, J. Bühring, M. N. Rao, K. -U. Schröder
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Additive Manufacturing Sandwich Structures Pyramidal Lattice Core Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/adfb1c572712422b9dd4815fb25ad095
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spelling	oai:doaj.org-article:adfb1c572712422b9dd4815fb25ad0952021-12-05T12:03:40ZDelamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder Bed Fusion10.1186/s10033-021-00643-71000-93452192-8258https://doaj.org/article/adfb1c572712422b9dd4815fb25ad0952021-12-01T00:00:00Zhttps://doi.org/10.1186/s10033-021-00643-7https://doaj.org/toc/1000-9345https://doaj.org/toc/2192-8258Abstract Sandwich structures possess a high bending stiffness compared to monolithic structures with a similar weight. This makes them very suitable for lightweight applications, where high stiffness to weight ratios are needed. Most common manufacturing methods of sandwich structures involve adhesive bonding of the core material with the sheets. However, adhesive bonding is prone to delamination, a failure mode that is often difficult to detect. This paper presents the results of delamination testing of fully additive manufactured (AM) AlSi10Mg sandwich structures with pyramidal lattice truss core using Laser Powder Bed Fusion (LPBF). The faces and struts are 0.5 mm thick, while the core is 2 mm thick. The inclination of the struts is 45°. To characterise the bonding strength, climbing drum peel tests and out-of-plane tensile tests are performed. Analytical formulas are derived to predict the expected failure loads and modes. The analytics and tests are supported by finite element (FE) calculations. From the analytic approach, design guidelines to avoid delamination in AM sandwich structures are derived. The study presents a critical face sheet thickness to strut diameter ratio for which the structure can delaminate. This ratio is mainly influenced by the inclination of the struts. The peel tests resulted in face yielding, which can also be inferred from the analytics and numerics. The out-of-plane tensile tests didn’t damage the structure.M. NuñoJ. BühringM. N. RaoK. -U. SchröderSpringerOpenarticleAdditive ManufacturingSandwich StructuresPyramidal Lattice CoreOcean engineeringTC1501-1800Mechanical engineering and machineryTJ1-1570ENChinese Journal of Mechanical Engineering, Vol 34, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Additive Manufacturing Sandwich Structures Pyramidal Lattice Core Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570
spellingShingle	Additive Manufacturing Sandwich Structures Pyramidal Lattice Core Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570 M. Nuño J. Bühring M. N. Rao K. -U. Schröder Delamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder Bed Fusion
description	Abstract Sandwich structures possess a high bending stiffness compared to monolithic structures with a similar weight. This makes them very suitable for lightweight applications, where high stiffness to weight ratios are needed. Most common manufacturing methods of sandwich structures involve adhesive bonding of the core material with the sheets. However, adhesive bonding is prone to delamination, a failure mode that is often difficult to detect. This paper presents the results of delamination testing of fully additive manufactured (AM) AlSi10Mg sandwich structures with pyramidal lattice truss core using Laser Powder Bed Fusion (LPBF). The faces and struts are 0.5 mm thick, while the core is 2 mm thick. The inclination of the struts is 45°. To characterise the bonding strength, climbing drum peel tests and out-of-plane tensile tests are performed. Analytical formulas are derived to predict the expected failure loads and modes. The analytics and tests are supported by finite element (FE) calculations. From the analytic approach, design guidelines to avoid delamination in AM sandwich structures are derived. The study presents a critical face sheet thickness to strut diameter ratio for which the structure can delaminate. This ratio is mainly influenced by the inclination of the struts. The peel tests resulted in face yielding, which can also be inferred from the analytics and numerics. The out-of-plane tensile tests didn’t damage the structure.
format	article
author	M. Nuño J. Bühring M. N. Rao K. -U. Schröder
author_facet	M. Nuño J. Bühring M. N. Rao K. -U. Schröder
author_sort	M. Nuño
title	Delamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder Bed Fusion
title_short	Delamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder Bed Fusion
title_full	Delamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder Bed Fusion
title_fullStr	Delamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder Bed Fusion
title_full_unstemmed	Delamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder Bed Fusion
title_sort	delamination testing of alsi10mg sandwich structures with pyramidal lattice truss core made by laser powder bed fusion
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/adfb1c572712422b9dd4815fb25ad095
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Delamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder Bed Fusion

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