Residual stress in mollusc shells

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dc.contributor.authorCortie, MBen_AU
dc.contributor.authorDowd, Aen_AU
dc.contributor.authorHe, KYHen_AU
dc.contributor.authorChoi, Aen_AU
dc.contributor.authorLuzin, Ven_AU
dc.date.accessioned2021-10-26T21:28:41Zen_AU
dc.date.available2021-10-26T21:28:41Zen_AU
dc.date.issued2016-11-29en_AU
dc.date.statistics2021-10-11en_AU
dc.description.abstractThe aragonite-protein composite material out of which the shells of most molluscs are made has a fracture toughness of about 8 MPa√m. This is surprisingly high considering that the aragonite phase has a bulk fracture toughness of only 0.9 MPa√m. One reason for the improved performance of the shell relative to pure aragonite is that it is comprised of a strongly textured array of aragonite platelets in an organic matrix. It is well known that cracks that initiate in an aragonite platelet are deflected, blunted or arrested when they reach the more ductile organic phase. We speculate that a compressive residual stress at strategic locations in the shell may further improve its resistance to crack propagation. To investigate this hypothesis we used neutron diffraction, X-ray diffraction and Raman spectroscopy in an attempt to identify whether a detectable stress distribution exists in a large mollusc shell and, if so, whether this stress state can provide enhanced fracture toughness. Freshly collected shells of the gastropod Ninella torquata (family Turbinidae), which has a diameter of about 10 cm, were used. The texture of the samples was readily extracted using neutron diffraction and an apparent residual stress gradient of several MPa identified. This effect was not evident in X-ray diffraction of powder samples taken in layers spaced through the wall thickness. The possible existence and implications of a non-uniform stress distribution through the shell are analyzed and discussed.en_AU
dc.identifier.citationCortie, M. B., Dowd, A., He, K. Y. H., Choi, A., & Luzin, V. (2016). Residual stress in mollusc shells. Paper presented at 13th AINSE-ANBUG Neutron Scattering Symposium, Sydney, NSW, Australia, 29-30 November 2016.en_AU
dc.identifier.conferenceenddate30 November 2016en_AU
dc.identifier.conferencename13th AINSE-ANBUG Neutron Scattering Symposiumen_AU
dc.identifier.conferenceplaceSydney, NSW, Australiaen_AU
dc.identifier.conferencestartdate29 November 2016en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12095en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineeringen_AU
dc.subjectComposite materialsen_AU
dc.subjectMolluscsen_AU
dc.subjectAragoniteen_AU
dc.subjectFracture propertiesen_AU
dc.subjectResidual stressesen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectX-ray diffractionen_AU
dc.titleResidual stress in mollusc shellsen_AU
dc.typeConference Abstracten_AU
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