Microhardness of the nacreous and prismatic seashell’s structures

Filetin, Tomislav and Šolić, Sanja and Jakovljević, Suzana (2010) Microhardness of the nacreous and prismatic seashell’s structures. = Microhardness of the nacreous and prismatic seashell’s structures. In: MATRIB 2010, 23.-25.06.2010., Vela Luka; Croatia.

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Abstract

The engineering cellular and composite materials (biomimetic) draw the inspiration for new development or improvement of properties. The nacreous, cross-lamellar and prismatic structures of seashells are especially interesting for analysis. The inner layer has a nacreous structure composed of aragonite platelets surrounded with an organic phase and in the outer layer a polygonal prismatic structure with very high ratio length/width has been determined. Nano- and micro-indentation gives valuable information about mechanical response particularly by compression, but also by tensile and shear load. The Vickers microhardness of Pinna Pectinata (Pinnidae) Adriatic Sea mollusc shells structure has been determined as a function of the indentation load and loading direction. The load dependence of microhardness is analyzed by using the known Meyer Law and modified proportional specimen resistance (PSR) model. The best correlation between measured values and used models is achieved by using the modified PSR model. The results show that the measured microhardness depends on the load for the nacreous and prismatic structures, except for the prismatic ones indented perpendicularly to the outer surface.

Item Type: Conference or Workshop Item (Poster)
Keywords (Croatian): microhardness; indentation size effect; seashell structures
Subjects: NATURAL SCIENCES > Biology
TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 1000 Department of Materials > 1010 Chair of Materials and Tribology
200 Department of Engineering Mechanics
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 07 Jul 2015 12:01
Last Modified: 07 Jul 2015 12:01
URI: http://repozitorij.fsb.hr/id/eprint/4470

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