Modelling size-dependent bending, buckling and vibrations of 2D triangular lattices by strain gradient elasticity models: applications to sandwich beams and auxetics

S Khakalo, V Balobanov, J Niiranen - International Journal of Engineering …, 2018 - Elsevier
The present work is devoted to the modelling of strongly size-dependent bending, buckling
and vibration phenomena of 2D triangular lattices with the aid of a simplified first strain …

Determination of metamaterial parameters by means of a homogenization approach based on asymptotic analysis

H Yang, BE Abali, D Timofeev, WH Müller - Continuum mechanics and …, 2020 - Springer
By using modern additive manufacturing techniques, a structure at the millimeter length
scale (macroscale) can be produced showing a lattice substructure of micrometer …

Variational formulations, model comparisons and numerical methods for Euler–Bernoulli micro-and nano-beam models

J Niiranen, V Balobanov, J Kiendl… - … and Mechanics of …, 2019 - journals.sagepub.com
As a first step, variational formulations and governing equations with boundary conditions
are derived for a pair of Euler–Bernoulli beam bending models following a simplified version …

[HTML][HTML] On the validation of homogenized modeling for bi-pantographic metamaterials via digital image correlation

E Barchiesi, F dell'Isola, F Hild - International Journal of Solids and …, 2021 - Elsevier
The derivation by variational asymptotic homogenization of a 2D-continuum model
describing large elastic planar deformations of a discrete bi-pantographic structure is …

A variational formulation for one-dimensional linear thermoviscoelasticity

I Giorgio - Mathematics and Mechanics of Complex Systems, 2022 - msp.org
A variational model describing a one-dimensional mechanical system in which heat
conduction phenomena occur is consistently formulated. Lagrangian variational perspective …

Anisotropic strain gradient thermoelasticity for cellular structures: Plate models, homogenization and isogeometric analysis

S Khakalo, J Niiranen - Journal of the Mechanics and Physics of Solids, 2020 - Elsevier
For three-dimensional cellular plate-like structures with a triangular (extruded lattice)
microarchitecture, the article develops a pair of two-scale plate models relying on the …

Isogeometric analysis for sixth-order boundary value problems of gradient-elastic Kirchhoff plates

J Niiranen, J Kiendl, AH Niemi, A Reali - Computer Methods in Applied …, 2017 - Elsevier
Sixth-order boundary value problems of a one-parameter gradient-elastic Kirchhoff plate
model are formulated in a weak form within an H 3 Sobolev space setting with the …

Three-point bending test of pantographic blocks: numerical and experimental investigation

ME Yildizdag, E Barchiesi… - … and Mechanics of …, 2020 - journals.sagepub.com
The equilibrium forms of pantographic blocks in a three-point bending test are investigated
via both experiments and numerical simulations. In the computational part, the …

Form II of Mindlin's second strain gradient theory of elasticity with a simplification: For materials and structures from nano-to macro-scales

S Khakalo, J Niiranen - European Journal of Mechanics-A/Solids, 2018 - Elsevier
The fundamental equations for Form II of Mindlin's second strain gradient elasticity theory for
isotropic materials are first derived. A corresponding simplified formulation is then proposed …

Locking-free variational formulations and isogeometric analysis for the Timoshenko beam models of strain gradient and classical elasticity

V Balobanov, J Niiranen - Computer Methods in Applied Mechanics and …, 2018 - Elsevier
The Timoshenko beam bending problem is formulated in the context of strain gradient
elasticity for both static and dynamic analysis. Two non-standard variational formulations in …