Numerical and experimental study on the collapse of a triangular cell under

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F21%3APU142418" target="_blank" >RIV/00216305:26210/21:PU142418 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0020768321003759?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0020768321003759?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijsolstr.2021.111295" target="_blank" >10.1016/j.ijsolstr.2021.111295</a>

Result language

angličtina

Original language name

Numerical and experimental study on the collapse of a triangular cell under

Original language description

Lattice materials can be described as arrangements of cell walls such as beams with joints of high stiffness. Loads on the macroscopic level of the lattice material can cause a loss of structural stability on the microscopic level and lead to buckling of cell walls. In this study the buckling and post-buckling deformation of a triangular cell with elasto-plastic material behavior is investigated in finite element (FE) analyses under compressive loading. The triangular cell is discretized with beam elements and the outcome is compared to simulations using a fine mesh of continuum elements. Both discretizations are investigated in nonlinear FE simulations since regular linear stability analysis cannot consider elasto-plastic material behavior and contact. In addition, the collapse of the triangular cells is studied experimentally with selective laser melted samples. The beam element model is capable of predicting the collapse behavior as well as the reaction force determined in the experiments and FE analyses with continuum elements. By applying eigenmodes from buckling analyses as initial imperfection to the triangular cell the beam element model is able to predict mode changes in the post buckling regime. The magnitude of imperfection is thereby in agreement with the geometrical deviation of the samples introduced by the selective laser melting (SLM) process. The outcome of the study is a methodology for investigating lattice materials computationally efficient with FE analyses and taking multiple nonlinearities into account. Consequently, it can be used to study two-or three-dimensional lattice structures with a large number of cell walls, nonlinear parent material and instability effects.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20302 - Applied mechanics

Project

<a href="/en/project/EF16_025%2F0007304" target="_blank" >EF16_025/0007304: Architectured materials designed for additive manufacturing</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

International Journal of Solids and Structures

ISSN

0020-7683

e-ISSN

1879-2146

Volume of the periodical

236

Issue of the periodical within the volume

76

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

1-12

UT code for WoS article

000720976300005

EID of the result in the Scopus database

2-s2.0-85118660162