Insight into the coordinated jetting behavior in periodic lattice structures under dynamic compression

The availability of additive manufacturing technologies in particular the selective laser sintering process has enabled the fabrication of high strength, lightweight and complex cellular lattice structures. In this study, the effective mechanical properties of selective laser sintering produced periodic lattice structures were investigated. Three different types of lattice structures were designed by repeating three types of open-form unit cells consisting of triangular prism, square prism and hexagonal prism. A novel approach of creating the complex and conformable lattice structures using traditional modelling software such as Creo® proposed by the authors was used. Based on the predesigned lattice structures, finite element analysis was carried out to evaluate the mechanical properties of these structures. For the experimental study, nylon samples were printed using a plastic selective laser sintering system and tested using a universal testing machine. Finite element analysis results show that lattice structures with triangular prism perform better than the other two prisms in terms of Young’s modulus to relative density ratio. Tensile tests results show good conformance with the results obtained from finite element analysis.

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Discrete and continuum models of heat conduction problems in periodic lattice structures

PAMM ◽

10.1002/pamm.200310510 ◽

2003 ◽

Vol 3 (1) ◽

pp. 481-482

Author(s):

Jolanta Szymczyk ◽

Czeslaw Wozniak

Keyword(s):

Heat Conduction ◽

Continuum Models ◽

Periodic Lattice ◽

Lattice Structures

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Novel Chiral Structure With Tailored Mechanical Response Exploiting Elastic Instabilities

Volume 2: Modeling, Simulation and Control; Bio-Inspired Smart Materials and Systems; Energy Harvesting ◽

10.1115/smasis2016-9162 ◽

2016 ◽

Author(s):

Falk Runkel ◽

Giulio Molinari ◽

Andres F. Arrieta ◽

Paolo Ermanni

Keyword(s):

Mechanical Response ◽

Local Buckling ◽

Unit Cell ◽

Periodic Lattice ◽

Nonlinear Behaviour ◽

Lattice Structures ◽

Chiral Structure ◽

Shape Adaptation ◽

Elastic Instabilities ◽

Structural Concept

This paper presents a structural concept that exploits elastic instabilities in novel periodic lattice structures for shape adaptation purposes. The nonlinear behaviour resulting from the occurrence of local buckling is utilised to achieve significant variations in the global structural response of the lattice. For the proposed structural concept, a unit cell is identified and utilised to investigate the mechanical characteristics for the load cases of uniaxial compression, shear, and rotation, conducting nonlinear finite element simulations. The results of the unit cell characterization are compared to the mechanical response of lattice structures under equivalent loading and convergence is achieved for all considered load cases. This paper therefore introduces a novel design concept to achieve selective compliance, especially beneficial for shape adaptation of wing structures.

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Vibration and buckling of general periodic lattice structures

10.2514/6.1984-979 ◽

1984 ◽

Cited By ~ 3

Author(s):

M. ANDERSON ◽

F. WILLIAMS

Keyword(s):

Periodic Lattice ◽

Lattice Structures

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Basic research of the consideration of additive manufactured lattice structures under thermoand fluid dynamic loads

MATEC Web of Conferences ◽

10.1051/matecconf/201929901009 ◽

2019 ◽

Vol 299 ◽

pp. 01009

Author(s):

Karim Abbas ◽

Laura Thurn ◽

Julia Kessler ◽

Fabian Eichler

Keyword(s):

Dynamic Properties ◽

Fluid Dynamic ◽

Basic Research ◽

Periodic Lattice ◽

Lattice Structures ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Powder Bed ◽

Lightweight Structures

This scientific research deals with lattice structures manufactured with laser powder bed fusion. Laser powder bed fusion is part of additive manufacturing. The so called layered construction is an increasingly used innovative manufacturing process that can be used to realize new design possibilities. Lightweight structures or bionic structures play a key role here. The focus of this work is on periodic lattice structures. In addition to saving resources and reducing the weight of components, lattice structures have particularly pronounced mechanical properties. However, little is known about their thermo- and fluid-dynamic properties. This work describes the first influencing factors of lattice structures ina thermo- and fluid-dynamic context using a case study. The aim of this paper is to evaluate important design and simulation criteria of lattice structures. Different lattice structures are considered, whose strut geometry is varied. The case study is carried out using a heat exchanger. While classical heat exchangers have lamellar structures, the substitution of these by lattice structures is evaluated. Thiswork represents a first consideration of the most important parameters and gives an overview of the most important core points.

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