1. Investigation of mechanical properties of crab shell: a review
Authors : Kishore Kumar Gadgey, Dr. Amit Bahekar
Pages : 268-281
DOI : http://dx.doi.org/10.21172/1.81.036
Keywords : Mechanical Properties, Crab Shell, Cuticle,Exoskeleton. Abstract :Abstract- The present review describes the development of investigations of mechanical properties of crab shell. The mechanical behavior of crab shell was investigated. There was low strain discontinuity in their bulk tensile stress-strain curves. The crab cuticle fails in an entirely brittle manner. The cuticle of the crab is a composite material, the properties of which are closely analogous to those of pre-stressed concrete. The mechanical properties of the exoskeleton of the sheep crab (Loxorhynchus grandis) were investigated earlier. It was found that the crab exoskeleton is a natural composite consisting of highly mineralized chitin–protein fibers arranged in a twisted plywood pattern. It was observed that there is a high density of pore canal tubules in the direction normal to the surface. Tensile tests were carried out on wet and dry specimens in longitudinal as well as normal directions. Samples tested in the longitudinal direction showed a convex shape and no evidence of permanent deformation prior to failure, whereas samples tested in the normal orientation exhibited a concave shape. The results show that the composite is anisotropic in mechanical properties. Micro indentation was performed to measure the hardness through the thickness. It was found that the outer layer is two times harder than the inner layer.
Citing this Journal Article :Kishore Kumar Gadgey, Dr. Amit Bahekar, "Investigation of mechanical properties of crab shell: a review", Volume 8 Issue 1 - January 2017, 268-281
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