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From:
A. Nasto, A. Ajdari, A. Lazarus, A. Vaziri, and P.M. Reis,
"Localization of deformation in thin shells under indentation" Soft Matter, DOI: 10.1039/C3SM50279A (2013). (Special Themed Issue on "Emerging Investigators in Soft Matter").
ABSTRACT: More recently, we have been studying the emergence and evolution of point and linear-like loci of localization on thin shells indented well into the nonlinear regime. For large enough indentation, sharp points of localized curvature form, which we refer to as ‘s-cones’ (for shell-cones), in contrast with their developable cousins in plates, ‘d-cones’. Through experiments and FEM, e have found that the shape of the indenter has a significant effect on the mechanical response and that there is a qualitative different between sharp and blunt indenters. Given the importance of geometry and the scale-invariance of this problem, our results should find uses at the microscale, e.g. for AFM, where it is crucial to understand how the curvature of the tip, relative to the object being indented, affects the mechanical response.
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