Calculating deflection and plasticity in bevelled composite polymeric-steel metering blades

A4 Konferenspublikationer


Interna författare/redaktörer


Publikationens författare: Alam P, Toivakka M
Publiceringsår: 2005
Moderpublikationens namn: Proceedings: PTS Coating Symposium 2005


Abstrakt

The deflection and deformation characteristics of bevelled composite polymeric-steel meter-ing blades are studied in this paper. Numerical methods are used to couple the effects of blade induced pressure build up in coating colours on the localised elasto-plastic soft-tip de-formation. Pressure release due to elastic deflection in the steel blade component is also ac-counted for in the model. The viscosity of the Newtonian coating colour is factored to ac-count for the increased solids content under the blade and the polymeric blade component follows von-Mises yield criterion. Pressure induced plasticity occurs at the blade heel as well as at the right-angled corner join between the polymeric and steel components. Simple trigonometric static theory is used to explain the relationship between the deflection of the steel component to the irrecoverable deformation of the polymeric soft-tip. Restraint of the blade closer to the tip generates higher stress concentrations at the polymer-steel corner joint and this alleviates stresses at the blade heel. Deformation is found to plateau beyond a certain distance of blade restraint. Increasing the coating viscosity is found to increase the magnitude of plastic deformation at the blade heel and polymers possessing different hard-ness properties are studied. Geometrical optimisation of the corner join lowers the very high levels of plastic deformation that occurs locally.

Senast uppdaterad 2019-16-11 vid 03:33