The quasi-static and blast loading response of lattice structures

McKown, S.; Shen, Yiou; Brookes, W.K.; Sutcliffe, Christopher; Cantwell, W.J.; Langdon, G.S.; Nurick, G.N.; Theobald, M.D.

doi:10.1016/j.ijimpeng.2007.10.005

Cited by 307 publications

(133 citation statements)

References 24 publications

Supporting

Mentioning

121

Contrasting

Order By: Relevance

“…Its presence is related to the choice of laser processing parameters and the morphology of the feedstock powder. It has been previously observed attached to the struts of SLM lattice structures [6,13,32]. In the case of our latticed structures, loosely bound powder may have a larger effect for smaller cells, where the dimensions of the struts and nodes are smallest.…”

Section: B Anomalous Behaviour Of the Smallest Cellsmentioning

confidence: 47%

Mechanical Properties of Ti-6Al-4V Selectively Laser Melted Parts with Body-Centred-Cubic Lattices of Varying cell size

et al. 2015

View full text Add to dashboard Cite

. (2015) Mechanical properties of Ti-6Al-4V selectively laser melted parts with body-centred-cubic lattices of varying cell size. Experimental Mechanics, 55 (7). pp. 1261 -1272 . ISSN 1741 -2765 Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/31973/1/Accepted_manuscript.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the University of Nottingham End User licence and may be reused according to the conditions of the licence. For more details see: http://eprints.nottingham.ac.uk/end_user_agreement.pdf A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk Significant weight savings in parts can be made through the use of additive manufacture (AM), a process which enables the construction of more complex geometries, such as functionally graded lattices, than can be achieved conventionally. The existing framework describing the mechanical properties of lattices places strong emphasis on one property, the relative density of the repeating cells, but there are other properties to consider if lattices are to be used effectively. In this work, we explore the effects of cell size and number of cells, attempting to construct more complete models for the mechanical performance of lattices. This was achieved by examining the modulus and ultimate tensile strength of latticed tensile specimens with a range of unit cell sizes and fixed relative density. Understanding how these mechanical properties depend upon the lattice design variables is crucial for the development of design tools, such as finite element methods, that deliver the best performance from AM latticed parts. We observed significant reductions in modulus and strength with increasing cell size, and these reductions cannot be explained by increasing strut porosity as has previously been suggested. We obtained power law relationships for the mechanical properties of the latticed specimens as a function of cell size, which are similar in form to the existing laws for the relative density dependence. These can be used to predict the properties of latticed column structures comprised of body-centred-cubic (BCC) cells, and may also be adapted for other part geometries. In addition, we propose a novel way to analyse the tensile modulus data, which considers a relative lattice cell size rather than an absolute size. This may lead to more general models for the mechanical properties of lattice structures, applicable to parts of varying size.

show abstract

Section: B Anomalous Behaviour Of the Smallest Cellsmentioning

confidence: 47%

Mechanical Properties of Ti-6Al-4V Selectively Laser Melted Parts with Body-Centred-Cubic Lattices of Varying cell size

et al. 2015

View full text Add to dashboard Cite

show abstract

“…McKown et al [37] tested a range of metallic lattice structures to investigate their collapse behavior, failure mechanisms and strain-rate sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Single Ti6Al4V Struts Made Using Selective Laser Melting and Electron Beam Melting Subject to Part Orientation

Weißmann

Drescher

Bader

et al. 2017

Metals

View full text Add to dashboard Cite

Abstract:The use of additive manufacturing technologies to produce lightweight or functional structures is widespread. Especially Ti 6 Al 4 V plays an important role in this development field and parts are manufactured and analyzed with the aim to characterize the mechanical properties of open-porous structures and to generate scaffolds with properties specific to their intended application. An SLM and an EBM process were used respectively to fabricate the Ti 6 Al 4 V single struts. For mechanical characterization, uniaxial compression tests and hardness measurements were conducted. Furthermore, the struts were manufactured in different orientations for the determination of the mechanical properties. Roughness measurements and a microscopic characterization of the struts were also carried out. Some parts were characterized following heat treatment (hot isostatic pressing). A functional correlation was found between the compressive strength and the slenderness ratio (λ) as well as the equivalent diameter (d) and the height (L) of EBM and SLM parts. Hardness investigations revealed considerable differences related to the microstructure. An influence of heat treatment as well as of orientation could be determined. In this work, we demonstrate the influence of the fabrication quality of single struts, the roughness and the microstructure on mechanical properties as a function of orientation.

show abstract

“…The compressive behavior was recorded with a digital camera from Pentax at defined deformation levels. Three-dimensional finite element simulations (quasi-static conditions) were performed using the standard software package ABAQUS [13] (Dassault Systems, Dresden, Germany)with the use of both eight-node continuum and two-node beam elements to represent the stain distribution within the struts and the struts in the unit cells, respectively. …”

Section: Methodsmentioning

confidence: 99%

Characterization of 316L Steel Cellular Dodecahedron Structures Produced by Selective Laser Melting

et al. 2016

View full text Add to dashboard Cite

Abstract:The compression behavior of different 316L steel cellular dodecahedron structures with different density values were studied. The 316L steel structures produced using the selective laser melting process has four different geometries: single unit cells with and without the addition of base plates beneath and on top, and sandwich structures with multiple unit cells with different unit cell sizes. The relation between the relative compressive strength and the relative density was compared using different Gibson-Ashby models and with other published reports. The different aspects of the deformation and the mechanical properties were evaluated and the deformation at distinct loading levels was recorded. Finite element method (FEM) simulations were carried out with the defined structures and the mechanical testing results were compared. The calculated theory, simulation estimation, and the observed experimental results are in good agreement.

show abstract

The quasi-static and blast loading response of lattice structures

Cited by 307 publications

References 24 publications

Mechanical Properties of Ti-6Al-4V Selectively Laser Melted Parts with Body-Centred-Cubic Lattices of Varying cell size

Mechanical Properties of Ti-6Al-4V Selectively Laser Melted Parts with Body-Centred-Cubic Lattices of Varying cell size

Comparison of Single Ti6Al4V Struts Made Using Selective Laser Melting and Electron Beam Melting Subject to Part Orientation

Characterization of 316L Steel Cellular Dodecahedron Structures Produced by Selective Laser Melting

Contact Info

Product

Resources

About