Computational Analysis of Crack-Like Defects Influence on the Open Cell Ceramic Foam Tensile Strength

Abstract:

Article Preview

This work deals with a computational analysis and quantification of the influence of processing (primarily crack-like) defects of various amount on the (tensile) strength of open cell ceramic foam structures. This information is essential e.g. for application of these materials in the mechanically loaded application, where a design with certain reliability to operating conditions is required. The analysed ceramic foam structures are composed of both regular and irregular cells and crack-like defects (pre-cracked struts) are simulated inside them. The foam structure is modelled using a 3D FE beam element based model created by utilization of the Voronoi tessellation technique. The tensile strength upon presence of various amount of pre-cracked struts is analysed based upon an iterative FE simulation on whose base the critical failure force leading to specimen fracture is determined. The performed parametric study relates the tensile strength of the foam structure to the amount of initial defects. With increasing amount of these defects, the foam strength decreases by approximately 30% with every 10% of broken struts. This information can be directly used for a fast estimation of the foam tensile strength if the fraction of broken struts to the intact ones is known (e.g. from a microscopic analysis).

Info:

Periodical:

Edited by:

Luis Rodríguez-Tembleque, Jaime Domínguez and Ferri M.H. Aliabadi

Pages:

271-276

Citation:

O. Ševeček et al., "Computational Analysis of Crack-Like Defects Influence on the Open Cell Ceramic Foam Tensile Strength", Key Engineering Materials, Vol. 774, pp. 271-276, 2018

Online since:

August 2018

Export:

Price:

$38.00

[1] W.E. Warren and A.M. Kraynik: Journal of Applied Mechanics Vol. 64 (1997), pp.787-794.

[2] H.X. Zhu, J.F. Knott and N.J. Mills: J. Mech. Phys. Solids Vol. 45 (1997), pp.319-343.

[3] K. Li, X.-. Gao and A.K. Roy: Composites Part B: Engineering Vol. 36 (2005), pp.249-262.

[4] C. Tekoglu, L.J. Gibson, T. Pardoen and P.R. Onck: Progress in Mat. Sc. Vol. 56 (2011), pp.109-138.

[5] A.P. Roberts and E.J. Garboczi: J. Mech. Phys. Solids Vol. 50 (2002), pp.33-55.

[6] J. HUANG and L. GIBSON: Acta Metallurgica Et Materialia Vol. 39 (1991), pp.1627-1636.

[7] O. Ševeček, P. Navrátil, R. Papšík, P. Skalka and M. Kotoul: Solid State Phenomena Vol. 258 (2017), pp.161-164.

DOI: https://doi.org/10.4028/www.scientific.net/ssp.258.161

[8] O. Ševeček, Z. Majer, L. Bertolla, Z. Chlup and M. Kotoul: Key Eng Mat Vol. 754 (2017), pp.99-102.

DOI: https://doi.org/10.4028/www.scientific.net/kem.754.99