PSI - Issue 23

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 23 (2019) 553–558

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Abstract Nowa ays used open cell foam cer mic materials are mostly f irreg lar structure which mean tha the shape of particular f am c lls d es n t exhibit any regular pattern. On on hand, such foam structures le d to only v ry slight anisotropic r even is tropic behavi r upon the mechanical loading, but on the oth hand they do not have an optimal resistance to failure upon giv n lo d conditions and level of porosity. The strength of t e cer mic f am structure can be thus further improved by design of cells having various regular shap s. Such foams can fi ally exhibit an orthot opic behav or from both the elastic and strength po nt of view. To under tand how differ nt types of cells influence the foam characte istics in various direc ions, foam structures with various c ll shapes were thus studied and investigated in terms of the r tensile s r ngth within this contr bution. The structures we e modelled by means of beam elem nt based FE models an by utiliza ion of the stress criterion de ining failure of particular struts. Totally six different cell types w re analyzed under consider ti of the same porosity of he fin l foam structure a amount of h strength anisotropy was quan ified. Relation between ie tation of struts with respe t to a loading directi n a d the foam trength was discussed in more details. Recommendations for an employment of particular cell types for specific loading conditions were given. © 201 9 The Authors. Published by Elsevier .V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Influence of the cell geometry on the tensile strength of open-cell ceramic foams Oldřich Ševeček a *, Roman Papšík a , Zdeněk Majer a , Michal Kotoul a a Brno University of Technology, Faculty of Mechanical Engineering, Institute of Solid Mechanics, Mechatronics and Biomechanics, Technick á 2896/2, 616 69 Brno, Czech Republic Abstract Nowadays used open cell foam ceramic materials are mostly of irregular structure which means that the shape of particular foam cells does not exhibit any regular pattern. On one hand, such foam structures lead to only very slight anisotropic or even isotropic behavior upon the mechanical loading, but on the other hand they do not have an optimal resistance to failure upon given loading conditions and level of porosity. The strength of the ceramic foam structure can be thus further improved by design of cells having various regular shapes. Such foams can finally exhibit an orthotropic behavior from both the elastic and strength point of view. To understand how different types of cells influence the foam characteristics in various directions, foam structures with various cell shapes were thus studied and investigated in terms of their tensile strength within this contribution. The structures were modelled by means of beam element based FE models and by utilization of the stress criterion defining failure of particular struts. Totally six different cell types were analyzed under consideration of the same porosity of the final foam structure and amount of the strength anisotropy was quantified. Relation between orientation of struts with respect to a loading direction and the foam strength was discussed in more details. Recommendations for an employment of particular cell types for specific loading conditions were given. 9th International Conference on Materials Structure and Micromechanics of Fracture Influence of the cell geometry on the tensile strength of open-cell ceramic foams Oldřich Ševeček a *, Roman Papšík a , Zdeněk Majer a , Michal Kotoul a a Brno University of Technology, Faculty of Mechanical Engineering, Institute of Solid Me hanics, Mechatronics and Biomechanics, Technick á 2896/2, 616 69 Brno, Czech Republic

Keywords: ceramic foam; Kelvin cell; Voronoi tesselation; tensile strength; FE model Keywords: ceramic foam; Kelvin cell; Voronoi tesselation; tensile strength; FE model

1. Introduction Open cell foam ceramic materials are nowadays widely used in various lightweight, high temperature or filtering applications but still not very often in mechanically loaded applications due their relatively low resistance to failure. 1. Introduction Open cell foam ceramic materials ar nowad ys widely used in various lightw ight, high temperature or iltering applications but still not very often in mechanically loaded applications due their relatively low resistance to failure.

* Corresponding author. Tel.: +420 5 4114 2857 E-mail address: sevecek@fme.vutbr.cz * Correspon ing author. Tel.: +420 5 4114 2857 E-mail address: sevecek@fme.vutbr.cz

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.144