Sea Urchin Spines as a Model-System for Permeable, Light-Weight Ceramics with Graceful Failure Behavior. Part II. Mechanical Behavior of Sea Urchin Spine Inspired Porous Aluminum Oxide Ceramics under Compression

Presser, Volker; Köhler, Christian; Živcová, Z. Vlčková; Berthold, Christoph; Nickel, Klaus G.; Schultheiss, Sigrid; Gregorová, Eva; Pabst, Willi

doi:10.1016/s1672-6529(08)60143-2

Cited by 18 publications

(19 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For both, the biomimetic ceramics and the natural samples, a more complexly shaped pore architecture (i.e., HM and cap segments) are characterized by a lower characteristic strength (15-25%) and smaller Weibull modulus (% 50%) compared to the parallel layered porous samples (i.e., PI and base segments). [21] The values for the base segments and homogenously porous alumina samples (% 8) are in agreement with the literature (8.1-13) [25] and a decrease in the Weibull modulus with increased porosity level is to be expected. Decreased reliability (i.e., smaller Weibull modulus) is caused by a broader defect/ imperfection distribution which ultimately will be the origins for crack formation.…”

Section: Weibull Statisticssupporting

confidence: 89%

“…ref. [20,21] modulus has been shown in a previous study [5] and by using a functional infiltration material a composite with improved optical/chemical/electrical properties can be obtained.…”

Section: Discussionmentioning

confidence: 75%

“…[21] . The alumina slurry was obtained from mixing submicron alumina powder (CT 3000SG, Almatis GmbH, Germany) and commercially available waxy corn starch adding 1 wt% of a commercial dispersant (Dolapix CE64, Zschimmer & Schwarz, Germany).…”

Section: Samples and Sample Preparationmentioning

confidence: 99%

“…[21] In this paper, we discuss the potential of sea urchin spine inspired biomimetic ceramics in the light of recent simulation work and new experimental data under cyclic compression and dynamic impact. It is important to note that the goal was not to create a 1:1 copy of sea urchin spines as a ceramic replica.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Lessons from Nature for the Construction of Ceramic Cellular Materials for Superior Energy Absorption

et al. 2011

View full text Add to dashboard Cite

Sea urchins (Echinoidea) are an evolutionary highly successfully and diverse class of animals populating earth's oceans for more than 450 millions of years. [1] Depending on the environmental challenges, sea urchins have adapted in behavior, size, and shape of their test (i.e., shell) resulting in a large variety of spine types. [2] Ranging from disk-like sand dollars living on and underneath the seabed to reef-dwelling spherical melon sea urchins: all sea urchins employ nanocrystalline calcium carbonate as a basic building material [3,4] forming lightweight-constructed shells and spines. The sponge-like calcite network (stereom) of spines, indeed, can reach ultra-high porosity levels of up to 75 vol%. [5] While advanced foams can reach an equally high porosity, [6] most porous ceramic materials derived from conventional processing techniques (e.g., starch-blended casting) are characterized by a maximum characteristic porosity of % 68 vol%.Living in high tidal energy environments, pencil [Heterocentrotus mammillatus (HM)] and lance [Phyllacanthus imperialis (PI)] sea urchins have long ( 150 mm) and thick (Ø % 10-15 mm) blunt spines which are not only used as spacers for predators but also to wedge the animals into pits of the reef. For this habitat, evolution has optimized spines of these sea urchins for combined light-weight and graceful failure fracture behavior. The large pore volume is accessible to sea water and is partially filled with organic material to enable spine growth and repair. Also, it is important to note that the spines are not characterized by a simple, homogenous porosity throughout the entire spine: there are layers and gradients of various pore sizes, geometries, and porosity levels.The entire solid body of sea urchins, i.e., including spines and teeth, is composed out of magnesium calcite (Ca x Mg 1Àx )CO 3 [3,7,8] grown (and regenerated) by a complex process of biomineralization. [4] In particular, sea urchin teeth COMMUNICATION [*] Dr. 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. 1042 wileyonlinelibrary.com ß

show abstract

Section: Weibull Statisticssupporting

confidence: 89%

Section: Discussionmentioning

confidence: 75%

Section: Samples and Sample Preparationmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Lessons from Nature for the Construction of Ceramic Cellular Materials for Superior Energy Absorption

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The detailed structure of spines and their potential biomimetic applications has recently gathered more attention (Presser et al 2009;Moureaux et al 2010;Tsafnat Grossmann and Nebelsick (2013a, b) have shown that a number of stereom types are present in the spines depending not only on the species involved, but also on the location of stereom with respect to position along the spines. Stereom types thus differ not only from the base to the tip (Figs.…”

Section: Stereom Architecturementioning

confidence: 99%

Evolution of Lightweight Structures

2015

Biologically-Inspired Systems

View full text Add to dashboard Cite

Motto: Structure and function of biological systems as inspiration for technical developments Throughout evolution, nature has constantly been called upon to act as an engineer in solving technical problems. Organisms have evolved an immense variety of shapes and structures from macro down to the nanoscale. Zoologists and botanists have collected a huge amount of information about the structure and functions of biological materials and systems. This information can be also utilized to mimic biological solutions in further technical developments. The most important feature of the evolution of biological systems is multiple origins of similar solutions in different lineages of living organisms. These examples should be the best candidates for biomimetics. This book series will deal with topics related to structure and function in biological systems and show how knowledge from biology can be used for technical developments in engineering and materials science. It is intended to accelerate interdisciplinary research on biological functional systems and to promote technical developments. Documenting of the advances in the field will be important for fellow scientists, students, public officials, and for the public in general. Each of the books in this series is expected to provide a comprehensive, authoritative synthesis of the topic.More information about this series at

show abstract