Flatwise compression property of hierarchical thermoplastic composite square lattice

Liu, Houchang; Chen, Liming; Du, Bing; Peng, Shiwei; Guo, Yongguang; Zhao, Yang; Chen, Liliang; Zhou, Hao; Li, Weiguo; Liu, Pan

doi:10.1016/j.compstruct.2018.11.047

Cited by 23 publications

(1 citation statement)

References 39 publications

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“…In addition to geometric parameters, the energy absorption properties can also be tailored by complex structures such as gradient, metal foam filled, multi-layered and different unit cell composed structures. They have been demonstrated to be more effective than single lattice structures in energy absorption [17][18][19][20]. Another method to enhance the mechanical properties or energy absorption capacity is to modify the structure of node connecting the struts, where the stress concentration usually arises when subjected to compression or impact load.…”

Section: Introductionmentioning

confidence: 99%

Compressive and Energy Absorption Properties of Pyramidal Lattice Structures by Various Preparation Methods

et al. 2021

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Metallic three-dimensional lattice structures exhibit many favorable mechanical properties including high specific strength, high mechanical efficiency and superior energy absorption capability, being prospective in a variety of engineering fields such as light aerospace and transportation structures as well as impact protection apparatus. In order to further compare the mechanical properties and better understand the energy absorption characteristics of metal lattice structures, enhanced pyramidal lattice structures of three strut materials was prepared by 3D printing combined with investment casting and direct metal additive manufacturing. The compressive behavior and energy absorption property are theoretically analyzed by finite element simulation and verified by experiments. It is shown that the manufacturing method of 3D printing combined with investment casting eliminates stress fluctuations in plateau stages. The relatively ideal structure is given by examination of stress–strain behavior of lattice structures with varied parameters. Moreover, the theoretical equation of compressive strength is established that can predicts equivalent modulus and absorbed energy of lattice structures.

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Section: Introductionmentioning

confidence: 99%

Compressive and Energy Absorption Properties of Pyramidal Lattice Structures by Various Preparation Methods

et al. 2021

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Silk Lattice Structures from Unidirectional Silk Fiber–Reinforced Composites for Breaking Energy Absorption

Wen

Zeng

et al. 2019

Adv Eng Mater

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Lightweight lattice structures engineered at various length scales have attracted considerable research and development (R&D) efforts. Natural silk fibers and their composites have shown great energy absorption potential and impact resistance. Herein, lattice structures are designed and fabricated from silk‐reinforced epoxy resin plastics (SFRPs). Unidirectional SFRPs from prepreg display excellent flexural modulus (6 GPa), flexural strength (194 MPa), and outstanding interlaminar shear strength (155 MPa), which is attributed to the strong physical and chemical affinity between silk and epoxy resin. The silk composite lattices (SCLs) of varied densities with pyramidal cores are fabricated from silk/epoxy resin prepreg. Under compression, combined fracture modes of Euler buckling (EB)/fracture crushing (FC) prolong the failure process of SCLs, and the specific energy reaches 7 J g−1, to surpass most plant fiber–reinforced composite lattices of a similar density. The new lattice structure well integrates the energy‐absorbing feature of natural silks and the lightweight characteristic of lattices for structural composite applications.

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Elasticity of Diametrically Compressed Microfabricated Woodpile Lattices

Shalchy,

Bhaskar

2024

Adv Eng Mater

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Modulus‐porosity relationships are invaluable to rational material design of porous and structured solids. When struts in a lattice are compressed diametrically, the mechanics is rather complex. Here we address the problem of modulus‐porosity in the spirit of scaling arguments and analyses based on simple ansatz followed by variational minimisation of the elastic potential energy. Using scaling arguments, we obtain a simple power law that the apparent modulus of elasticity scales quadratically with the volume fraction for diametrically compressed elastic lattices. The modulus‐porosity relationship is found to be consistent with our computations and laboratory experiments on additively manufactured woodpile lattices with various cross‐sectional shapes and lattice spacing. We also show that the persistence length of diametrically pinched elastic rods is small, so that the effect of compressive strain from neighbouring sites can be ignored. The decay behaviour is surprisingly accurately captured by the variational approach and is consistent with computations. Finally, we identify the range of validity of the quadratic power law presented here–it is up to relative density ∼80%. On the apparent modulus‐porosity plane, the experimental data aligns well with the power law for modulus‐porosity predicted from simple analyses and finite element (FE) calculations.This article is protected by copyright. All rights reserved.

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Flatwise compression property of hierarchical thermoplastic composite square lattice

Cited by 23 publications

References 39 publications

Compressive and Energy Absorption Properties of Pyramidal Lattice Structures by Various Preparation Methods

Compressive and Energy Absorption Properties of Pyramidal Lattice Structures by Various Preparation Methods

Silk Lattice Structures from Unidirectional Silk Fiber–Reinforced Composites for Breaking Energy Absorption

Elasticity of Diametrically Compressed Microfabricated Woodpile Lattices

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