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Item type:Publication, Access status: with files , Hierarchical microcrack model for materials exemplified at enamelThis article investigates the mechanical properties of a material with hierarchically arranged microcracks.Publicationtype: Journal ArticleScopus© Citations 7 306 456 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Fracture behavior of hydroxyapatite nanofibers in dental enamel under micropillar compression(Elsevier, 2012-11-10); ; ; ; Understanding the structure-property relations of load-bearing natural materials can provide design strategies for the generation of bio-inspired materials showing enhanced mechanical properties. Dental enamel is a highly damage-tolerant biological nanocomposite having a high mineral content. Its hierarchical structure consists of hydroxyapatite nanofibers enveloped by proteins on the smallest length scale. In this work, we show the fracture behavior of nanofibers in enamel by conducting micropillar compression tests. The evaluation and the result of the mechanical properties are discussed.Publicationtype: Journal Article90 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Hierarchical flexural strength of enamel : transition from brittle to damage-tolerant behaviour(Royal Society of London, 2011-10-26); ; ; ; Hard, biological materials are generally hierarchically structured from the nano- to the macroscale in a somewhat self-similar manner consisting of mineral units surrounded by a soft protein shell. Considerable efforts are underway to mimic such materials because of their structurally optimized mechanical functionality of being hard and stiff as well as damage-tolerant. However, it is unclear how different hierarchical levels interact to achieve this performance. In this study, we consider dental enamel as a representative, biological hierarchical structure and determine its flexural strength and elastic modulus at three levels of hierarchy using focused ion beam (FIB) prepared cantilevers of micrometre size. The results are compared and analysed using a theoretical model proposed by Jäger and Fratzl and developed by Gao and co-workers. Both properties decrease with increasing hierarchical dimension along with a switch in mechanical behaviour from linear-elastic to elastic-inelastic. We found Gao's model matched the results very well. This journal is © 2011 The Royal Society.Publicationtype: Journal Article173