An analysis of inner cone cracks in brittle solids subject to cyclic indentation in liquid is presented. These inner cone cracks, so named because they form well within the maximum contact circle, are postulated to be driven by a hydraulic pumping mechanism. Unlike their more traditional outer cone crack counterparts, inner cones do not appear in monotonic loading or even cyclic loading in the ...

A combination of in situ vibrational sum-frequency generation (SFG) spectroscopy and molecular-dynamics (MD) simulations has allowed us to study the effects of indentation of self-assembled octadecylphosphonic acid (ODPA) monolayers on α-Al2O3(0001). Stress-induced changes in the vibrational signatures of C-H stretching vibrations in SFG spectra and the results of MD simulations provide clear e...

ÐNanoindentation for measuring thin ®lm mechanical properties is probably the most popular yet ill-understood method due to its inherent complexities. As opposed to burst pressure or microtensile tests of lithographed structures, where relatively uniform stress ®elds may be generated, the indentation-induced stress gradients can produce unique challenges. Because of the test's simplicity and ab...

The work hardening behaviour of GCr15 bearing steel during rolling contact fatigue (RCF) is investigated. Ball-on-rod RCF tests and micro-indentation are performed to obtain various subsurface hardness profiles in rod specimens. It found that orthogonal shear stress responsible for under Hertzian the extent increase positively associated with level number cycles. A dislocation-based model estab...

Abstract Based on Galin’s theorem for the indentation of an elastic half-space by a polynomial punch and Barber’s determination contact area in normal problems, exact solution is developed frictionless ellipsoidal power-law punch. Within Cattaneo–Mindlin-approximation tangential contacts, problem with friction can be reduced to via Ciavarella–Jäger principle, based which also indenter given. Al...

In order to determine the origin of image contrast in piezoresponse force microscopy (PFM), analytical descriptions of the complex interactions between a small tip and ferroelectric surface are derived for several sets of limiting conditions. Image charge calculations are used to determine potential and field distributions at the tip-surface junction between a spherical tip and an anisotropic d...

Abstract A primary target towards the clean-up operation of Fukushima disaster is retrieval Molten Core-Concrete Interaction (MCCI) products, presently residing on basement damaged nuclear reactor Units 1–3. MCCI a fusion materials, composed both fuel cladding and neighbouring structural components. Determining currently unknown, physical mechanical properties essential for successful timely re...