Affordable Access

Publisher Website

Interfacial fracture toughness of vacuum-plasma-sprayed coatings

DOI: 10.1016/b978-0-444-89074-0.50045-x


Abstract A test is described in which a crack is artificially introduced into the interface between a substrate and coating produced by thermal spraying. This crack is then caused to propagate under heavily mixed mode conditions by means of a four-point-bending arrangement. Computations are outlined which allow evaluation of the interfacial fracture energy and critical stress intensity factor from load-displacement data. These calculations incorporate the effect of residual stresses, which are often large in thermally sprayed coatings. Experiments are described involving titanium coatings deposited on titanium alloy substrates under a single set of spraying parameters. The residual stress states employed in the calculations were those obtained from a previously developed computer programme, describing stress build-up during spray deposition. Data from the modelling indicate that the magnitude and distribution of the residual stresses can exert a significant influence over the interfacial toughness and that their omission from the analysis changes the values obtained.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times