Interfacial shear strength in abalone nacre |
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| Authors: | Albert Yu-Min Lin,Marc Andr Meyers |
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| Affiliation: | aMaterials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093-0411, USA;bDepartment of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093-0411, USA;cDepartment of Nanoengineering, University of California, San Diego, La Jolla, CA 92093-0411, USA |
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| Abstract: | The shear strength of the interface between tiles of aragonite in the nacre of red abalone Haliotis rufescens was investigated through mechanical tensile and shear tests. Dog-bone shaped samples were used to determine the tensile strength of nacre when loaded parallel to the plane of growth; the mean strength was 65 MPa. Shear tests were conducted on a special fixture with a shear gap of 200 μm, approximately 100 μm narrower than the spacing between mesolayers. The shear strength is found to be 36.9±15.8 MPa with an average maximum shear strain of 0.3. Assuming the majority of failure occurs through tile pull-out and not through tile fracture, the tensile strength can be converted into a shear strength of 50.9 MPa. Three mechanisms of failure at the tile interfaces are discussed: fracture of mineral bridges, toughening due to friction created through nanoasperities, and toughening due to organic glue. An additional mechanism is fracture through individual tiles. |
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