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Strut waviness and load orientation affected fracture toughness knockdown in biaxially woven square lattices

Material imperfection, especially struts waviness attributed to fabrication and service phase, may cause the decay of the fracture resistance of lattice structures. Accordingly, a cautionary step must be taken to ensure the correct fracture properties are employed in the analysis and design of latti...

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Main Authors: Kueh, A.B.H., Kho, V.T.
Format: Article
Published: Elsevier B.V. 2019
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://ir.unimas.my/id/eprint/27446/
https://www.sciencedirect.com/science/article/pii/S0020740319313281
https://doi.org/10.1016/j.ijmecsci.2019.105172
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spelling my.unimas.ir.274462021-03-30T08:09:05Z http://ir.unimas.my/id/eprint/27446/ Strut waviness and load orientation affected fracture toughness knockdown in biaxially woven square lattices Kueh, A.B.H. Kho, V.T. TA Engineering (General). Civil engineering (General) Material imperfection, especially struts waviness attributed to fabrication and service phase, may cause the decay of the fracture resistance of lattice structures. Accordingly, a cautionary step must be taken to ensure the correct fracture properties are employed in the analysis and design of lattices before further utilized in applications. Hence, strut waviness effects on the fracture toughness, KC, of square lattices with respect to numerous loading orientations are of concern in this paper. To examine these effects, square lattices with struts in flat (planar) and biaxially woven configurations are numerically considered. KC is assessed by introducing plane-tension to centrally-cracked lattices for various relative densities ( = 0.05, 0.1, 0.15, and 0.2) and loading directions (α = 0°–90°). In all cases, KC of planar lattices are greater than those woven, with as high as 91.7% of performance knockdown in the latter due to the waviness and loading direction effects. In general, KC correlates directly with relative density but inversely with loading direction. KC enhancement is greater in planar lattices compared to those woven when the relative density is increased. Both lattices exhibit anisotropic KC, in which the effects on the planar lattices are more evident. Failure modes of both lattices are found to be independent of relative density but greatly influenced by loading orientations. A shifting in failure mode from plane-tension to plane-shear can be noticed in accordance with the transition angle α = αt as the loading orientation increases. Elsevier B.V. 2019 Article PeerReviewed Kueh, A.B.H. and Kho, V.T. (2019) Strut waviness and load orientation affected fracture toughness knockdown in biaxially woven square lattices. International Journal of Mechanical Sciences, 164. ISSN 0020-7403 https://www.sciencedirect.com/science/article/pii/S0020740319313281 https://doi.org/10.1016/j.ijmecsci.2019.105172
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Kueh, A.B.H.
Kho, V.T.
Strut waviness and load orientation affected fracture toughness knockdown in biaxially woven square lattices
description Material imperfection, especially struts waviness attributed to fabrication and service phase, may cause the decay of the fracture resistance of lattice structures. Accordingly, a cautionary step must be taken to ensure the correct fracture properties are employed in the analysis and design of lattices before further utilized in applications. Hence, strut waviness effects on the fracture toughness, KC, of square lattices with respect to numerous loading orientations are of concern in this paper. To examine these effects, square lattices with struts in flat (planar) and biaxially woven configurations are numerically considered. KC is assessed by introducing plane-tension to centrally-cracked lattices for various relative densities ( = 0.05, 0.1, 0.15, and 0.2) and loading directions (α = 0°–90°). In all cases, KC of planar lattices are greater than those woven, with as high as 91.7% of performance knockdown in the latter due to the waviness and loading direction effects. In general, KC correlates directly with relative density but inversely with loading direction. KC enhancement is greater in planar lattices compared to those woven when the relative density is increased. Both lattices exhibit anisotropic KC, in which the effects on the planar lattices are more evident. Failure modes of both lattices are found to be independent of relative density but greatly influenced by loading orientations. A shifting in failure mode from plane-tension to plane-shear can be noticed in accordance with the transition angle α = αt as the loading orientation increases.
format Article
author Kueh, A.B.H.
Kho, V.T.
author_facet Kueh, A.B.H.
Kho, V.T.
author_sort Kueh, A.B.H.
title Strut waviness and load orientation affected fracture toughness knockdown in biaxially woven square lattices
title_short Strut waviness and load orientation affected fracture toughness knockdown in biaxially woven square lattices
title_full Strut waviness and load orientation affected fracture toughness knockdown in biaxially woven square lattices
title_fullStr Strut waviness and load orientation affected fracture toughness knockdown in biaxially woven square lattices
title_full_unstemmed Strut waviness and load orientation affected fracture toughness knockdown in biaxially woven square lattices
title_sort strut waviness and load orientation affected fracture toughness knockdown in biaxially woven square lattices
publisher Elsevier B.V.
publishDate 2019
url http://ir.unimas.my/id/eprint/27446/
https://www.sciencedirect.com/science/article/pii/S0020740319313281
https://doi.org/10.1016/j.ijmecsci.2019.105172
_version_ 1696979498169270272
score 13.244404

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