Experimental study of modulus, strength and toughness of 2D triangular lattices

Gu, Huaiyuan; Pavier, Martyn J; Shterenlikht, Anton

doi:10.1016/j.ijsolstr.2018.06.028

Cited by 55 publications

(31 citation statements)

References 15 publications

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“…Therefore, the fatigue crack path in all lattice plates had a specific pattern: the crack developed in the direction 30 o to the horizontal axis of the initial edge crack in the upper half plate. This is identical to the crack propagation behaviour of similar lattices under monotonic fracture conditions [9].…”

Section: Experimental Procedures and Resultssupporting

confidence: 79%

“…Since lattice structures used in practice usually cover large areas or have a large number of cells, it is necessary to study the fatigue response of huge lattice plates. Gu et al [9] performed experiments on triangular lattice plates and showed that a ratio of specimen width to unit cell size of 24 can mimic the response of an infinitely-extended lattice plate. The lattice plate in this paper used to predict fatigue life has 27 cells in length and 24 cells in width.…”

Section: Prediction Of Crack Growth Ratementioning

confidence: 99%

“…There has been extensive research on the stiffness and strength of a wide range of 2D and 3D lattices as well as their fracture properties and damage tolerance [2,[5][6][7][8][9]. Recently, the fatigue behaviour of lattice structures has attracted more and more attention [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The effective elastic properties of lattice material are related to the parent material and topology. The effective Young's modulus and Poisson's ratio can be calculated from the following formula[9]:…”

mentioning

confidence: 99%

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Fatigue of thin periodic triangular lattice plates

Shterenlikht

Pavier

et al. 2019

MATEC Web Conf.

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A method for predicting the fatigue life of triangular lattices is proposed in this paper by considering fatigue properties of single lattice struts. Fatigue tests of different sizes of lattice plates of aluminium alloy, and tests of single struts with different maximum fluctuating loads, have been conducted to validate this method. It is found that the struts in a triangular lattice break near to strut intersections, where stress and strain concentrations occur. Similar crack propagation paths were observed in different lattice plate specimens: the cracks grew at a 30° angle to the initial edge crack in the upper half of lattice plate. The mixed-mode fatigue crack propagation rate was also studied and expressed using an effective stress intensity factor. A size effect on the crack growth rate of triangular lattice plates was also observed: a fatigue crack will propagate slightly quicker in larger triangular plates than in smaller ones.

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Section: Experimental Procedures and Resultssupporting

confidence: 79%

Section: Prediction Of Crack Growth Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Fatigue of thin periodic triangular lattice plates

Shterenlikht

Pavier

et al. 2019

MATEC Web Conf.

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“…A lattice orientation effect has also been demonstrated. It was found that strength and fracture toughness of two-dimensional triangular lattices vary remarkably with orientation, although the modulus was almost isotropic [13]. The validity of using linear elastic fracture mechanics(LEFM)technique on lattices has been assessed for two-dimensional topologies, where a reasonable results were achieved for lattices with sufficiently large numbers of cells and a large crack size [12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Fracture of three-dimensional lattices manufactured by selective laser melting

Pavier

et al. 2019

International Journal of Solids and Structures

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Experimentation has been performed to measure the fracture behaviour of three-dimensional lattices manufactured using a Selective Laser Melting (SLM) technique. Specimens have been designed using a compact tension (CT) geometry with different lattice orientations and fabricated from a relatively brittle Aluminum alloy. The toughness has been measured and an increase in fracture resistance has been observed during crack extension. The influence of lattice orientation has been demonstrated, which shows that a change in orientation will result in a different crack path, but the effect on toughness is small. Finally, the significance of specimen size on toughness measurement has been investigated using finite element (FE) analysis. The results show that the experimentally measured result have overestimated the fracture toughness of the lattice specimens by approximately 10% due to the insufficiently large specimen size.

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