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- W2550304344 abstract "Abstract The strength of a polycrystalline alumina containing controlled scratches introduced by translated sharp contacts is investigated and described by a multiscale fracture mechanics model. Inert strength measurements of samples containing quasi‐static and translated Vickers indentation contacts showed that scratches degraded the strength at normal contact loads an order of magnitude less than those for quasi‐static indentation. The fracture mechanics model developed to describe strength degradation by scratches over the full range of contact loads included toughening effects by crack‐wake bridging at the microscale and lateral crack‐based residual stress relaxation effects at the mesoscale. A critical element of the model is the nonlinear scaling of the residual stress field of a scratch with the normal contact load acting during scratch formation. The similarities and differences in the scratch model in comparison with prior indentation‐strength fracture mechanics models are highlighted by parallel development of both. Central to the scratch model is the use of easily controlled normal contact load as the scratch‐strength measurement variable. Scratch length and orientation are shown to have significant effects on strength. The distributions of scratch widths controlling the intrinsic strengths of as‐received samples are determined and agreement with the observed scratch dimensions is demonstrated." @default.
- W2550304344 created "2016-11-30" @default.
- W2550304344 creator A5091276876 @default.
- W2550304344 date "2016-11-07" @default.
- W2550304344 modified "2023-10-13" @default.
- W2550304344 title "Fracture mechanics of sharp scratch strength of polycrystalline alumina" @default.
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- W2550304344 doi "https://doi.org/10.1111/jace.14634" @default.
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