Cook, R.
(2017),
Blunt scratch strength of polycrystalline alumina, Journal of the American Ceramic Society
(Accessed April 29, 2024)
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Blunt scratch strength of polycrystalline alumina
Published
Author(s)
Abstract
A model for the fracture strength of brittle materials controlled by blunt (spherical) scratches is developed and compared with measurements on a polycrystalline alumina. The model is based on a residual stress-intensity factor for median cracks at scratches that include a localized plastic deformation zone formed by dragged spherical contacts. The stress-intensity factor depends non-linearly on the normal contact load, P, resulting in a predicted strength variation of P<-3/4>. The strength result validates previous claims and extends the overall indentation-strength framework. However, the result has only limited effectiveness in describing experimental measurements, pertaining only to ideal blunt scratches formed over a limited load domain.Citation
Journal of the American Ceramic Society
Pub Type
Journals
Keywords
alumina, fracture, indentation, mechanical properties, scratch
Citation
Created August 21, 2017, Updated October 14, 2022