<p>Erosion wear caused by the impacts of particles is one of the most common harmful behaviors of equipment in the multi-phase flow. Material erosion caused by particles impacts during hydraulic fracturing results in significant economic loss and increased production risks. The performed literature survey indicates that the majority of existing investigations are focused on non-overlapping particle impacts on the target material. And the influence of overlapping impact on wall is complex and has not been clearly explained through physical experiments. In order to improve the accuracy of the erosion prediction, it is necessary to consider the influences of neighboring particles in the calculations.Therefore, Johnson-Cook hardening criterion and Johnson-Cook damage criterion are used in ABAQUS software to study erosion crater morphology and stress distribution on target materials subjected to overlapping impacts of spherical particles. The accuracy of the model is verified by impact experiments. The results show that the impact location of the neighboring particles, which is defined as the horizontal distance between the solid particle impacting spot, can significantly affect the erosion magnitude and pattern. As the horizontal distance between two impacts increases from 0 to 0.6 times the particle diameter, the interaction of the formed craters gradually decreases. When the horizontal distance is beyond 0.6 times the particle diameter, the interaction between two craters is disappeared. And the depth difference between two craters is increased under the impact of adjacent particles. As the impact velocity increases from 14 m/s to 22 m/s, the difference between the depth of two craters is increased from 3.23 µm to 14.7 µm. When the impact angle increases from 25° to 85°, the depth difference between the two craters is increased from 0.11 μm to 14.40 μm. Furthermore, after the particles impact the target, more than 80% of the energy is converted into internal energy. This includes a little damage dissipation energy, and the energy dissipated by the damage is 0.06 mJ, accounting for only 0.07% of the energy conversion. and stored in the target. The remaining part is dissipated in the form of friction. In hence, the removal of the target material by the impact particles is limited under the plastic deformation erosion. The continuous impacts and long-term accumulation of a large number of particles are important factors that lead to the erosion problem of pipelines. The numerical simulation results of the dynamic erosion process in this paper can provide a scientific basis for material erosion prediction caused by multi-particle impacts and insight into erosion mechanism caused by overlapping particles impacts.</p>

Effect of Particle Overlapping Impacts in Erosion Process

Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2021/volume/85543

ASME 2021 International Mechanical Engineering Congress and Exposition (IMECE2021)

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