Towards mussels under stress: Novel concepts to design hierarchical architectures with high reliability and high fracture resistance

0450460 - ÚFM 2016 RIV ES eng A - Abstract
Bermejo, R. - Chang, Y. - Chlup, Zdeněk - Ševeček, O. - Danzer, R. - Messing, G.L.
Towards mussels under stress: Novel concepts to design hierarchical architectures with high reliability and high fracture resistance.
14th International Conference European Ceramics Society. Toledo: ECERS, 2015. ISBN 978-84-606-9257-7.
[ECERS 14 - International Conference of the European Ceramic Society /14./. 21.06.2015-25.06.2015, Toledo]
Institutional support: RVO:68081723
Keywords : hierarchical architectures * reliability * fracture resistance
Subject RIV: JL - Materials Fatigue, Friction Mechanics

In this paper, novel concepts are presented which combine different approaches used in layered architectural design with strong interfaces aiming to obtain highly reliable ceramic materia ls with high fracture resistance. On the one hand, the use of tailored residual stresses in embedded layers within the structure is demonstrated to act as an effective barrier to the propagation of surface flaws, providing a minimum design strength for the material, below which failure cannot take place [3]. On the other hand, texturing of the microstructure in embedded layers is utilized to provide preferential paths for conducting propagating cracks (Fig. 2), thus protecting the underlying structure [4]. In addition, recent work has shown that the combination of layers in a non - periodic manner can be more effective in arresting the propagation of cracks than the commonly used periodic designs [5].The location and thickness of the layers designed with compr essive stresses can be optimized to maximize the crack growth resistance of the multilayer system. A combination of experiments and modelling is presented, showing the potential of layered architectures in the design of future ceramic components with spati ally resolved strength and toughnes [6]
Permanent Link: http://hdl.handle.net/11104/0252335