Abstract
A phenomenological model for single particle erosion (SPE) of plastic materials was constructed based on the Hertzian contact theory and conservation of momentum to solve the particle impact erosion. The extrusion deformation and contact time of materials in three processes of wall elastic extrusion, elastic-plastic extrusion, and elastic recovery were discussed. Later, the critical angle for sliding contact between the particle and metal surface was calculated according to the impact angle of a particle and the corresponding critical sliding friction force of the particle. The wall indentation depths under sliding contact and no sliding contact were compared. Finally, the erosion volume of materials by impact of a single particle was gained. Moreover, a contrastive analysis on calculation results was carried out by using the gas-solid jet erosion experiment. Contact time, normal and tangential deformations of materials, as well as material erosion under sliding contact and no sliding contact in two processes of particle extrusion and rebound were gained from calculation and experiment. The constructed model showed a good agreement without involving too many empirical coefficients.
Highlights
The particles in liquid-solid or gas-solid two-phase flow are inevitable to impact the pipe wall, forming particle impact erosion and causing material loss on pipe walls
The calculation of deformation and loss volume of metal surface caused by single particle impact involves studies concerning contact between particles and metal surface, deformation of metal surface, and particle deformation during 1960s~1970s [1,2,3,4]
Erosion models used in macroscopic calculation generally contain few physical parameters and replace rest necessary parameters by empirical coefficients gained from experiments
Summary
The particles in liquid-solid or gas-solid two-phase flow are inevitable to impact the pipe wall, forming particle impact erosion and causing material loss on pipe walls. Sheldon and Kanhere [9] constructed an erosion prediction model which didn’t divide by the impact angle This model only involved some parameters which are easy to be gained, such as particle diameter, particle density, particle impact speed, and surface hardness of materials. The vertical indentation and tangential extrusion were gained from a complicated physical deduction, which were used to form the total erosion rate This model introduced in the low-cycle fatigue formula based on the material deformation caused by single particle impact to calculate material strain under the impacts of multiple particles. Erosion models used in macroscopic calculation generally contain few physical parameters and replace rest necessary parameters by empirical coefficients gained from experiments These models [6,7,8,9,16,17,18] depend highly on experimental measurement and have complex application steps, even though they show high prediction accuracy. The calculated results showed a good agreement without involving too many empirical coefficients
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