The authors gratefully acknowledge the funding of this study by the Landesstiftung Baden-Württemberg foundation as a part of the interdisciplinary project “New materials from bionics.” The workshop of the Institute of Geoscience (N. Walker, B. Maier) is thanked for realizing various modifications on the universal testing machine and constant support throughout the project. V. P. acknowledges financial support by the Alexander-von-Humboldt Foundation. Supporting Information is available from the Wiley Online Library or from the author.
Lessons from Nature for the Construction of Ceramic Cellular Materials for Superior Energy Absorption†
Article first published online: 20 JUN 2011
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Special Issue: Cellular Materials
Volume 13, Issue 11, pages 1042–1049, November 2011
How to Cite
Presser, V., Schultheiß, S., Kohler, C., Berthold, C., Nickel, K. G., Vohrer, A., Finckh, H. and Stegmaier, T. (2011), Lessons from Nature for the Construction of Ceramic Cellular Materials for Superior Energy Absorption. Adv. Eng. Mater., 13: 1042–1049. doi: 10.1002/adem.201100066
- Issue published online: 28 OCT 2011
- Article first published online: 20 JUN 2011
- Manuscript Revised: 13 APR 2011
- Manuscript Received: 21 FEB 2011
Sea urchin spines combine extreme lightweight construction with impact resistance and improved mechanical strength although being made of presumably brittle calcium carbonate (calcite). Lance and pencil sea urchins (Phyllacanthus imperialis and Heterocentrotus mammillatus) are of particular interest as they exhibit large and mechanical very stable spines and the constructional concepts of these spines was translated into graded porous alumina ceramics derived from starch-blended slip casting. A high level of porosity (>30 vol%) is identified as the important element for graceful failure in polycrystalline alumina and graded porosity, i.e., layers of higher and lower density, can significantly improve the impact resistance of the material giving raise to what we refer to as cascading graceful failure: a mechanical response of porous materials with curved layers of graded porosity that maintains a high level of compressive strength even after the linear elastic threshold is surpassed and local structural collapse occurs.