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2020
Journal Article
Titel
Anisotropy of Mechanical Properties of Pinctada margaritifera Mollusk Shell
Abstract
The mechanical properties such as compressive strength and nanohardness were investigated for Pinctada margaritifera mollusk shells. The compressive strength was evaluated through a uniaxial static compression test performed along the load directions parallel and perpendicular to the shell axis, respectively, while the hardness and Young modulus were measured using nanoindentation. In order to observe the crack propagation, for the first time for such material, the in-situ X-ray microscopy (nano-XCT) imaging (together with 3D reconstruction based on the acquired images)during the indentation tests was performed. The results were compared with these obtained during the micro-indentation test done with the help of conventional Vickers indenter and subsequent scanning electron microscopy observations. The results revealed that the cracks formed during the indentation start to propagate in the calcite prism until they reach a ductile organic matrix where most of them are stopped. The obtained results confirm a strong anisotropy of both crack propagation and the mechanical strength caused by the formation of the prismatic structure in the outer layer of P. margaritifera shell.
Author(s)
Strag, Martyna
Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, Poland
Maj, Åukasz
Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, Poland
Bieda, Magdalena
Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, Poland
Petrzak, PaweÅ
Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, Poland
Jarzebska, Anna
Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, Poland
Berent, Katarzyna
Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, 30-059 Krakow, Poland
Nalepka, Kinga
Department of Strength and Fatigue of Materials and Structures, AGH University of Science and Technology, 30-059 Krakow, Poland
Checa, Antonio G.
Department of Stratigraphy and Paleontology, University of Granada, 18071 Granada, Spain