Computational modeling of the dynamics and interference effects of an erosive granular jet impacting a porous, compliant surface
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The general problem of a loosely flowing erosive granular jet undergoing impact with a compliant surface is common in many manufacturing processes, and also in the operating environment of a variety of machine parts. This paper presents a three-dimensional, collision-driven discrete particle simulation framework for investigating the dynamics of a jet of erosive particles impacting a surface with a specified porosity and compliance. The framework is capable of handling repeated collisions between incoming particles and rebounding particles, and between particles and surfaces. It is also capable of performing a coupled simultaneous calculation of sub-surface stresses in the material, assuming a certain porosity. Well illustrated numerical examples are presented with detailed analysis for investigations on the mechanics and energetics of the interfering collisions in eroding jets close to the target surface, on the effect of such interference on the material erosion, and on the evolving stress levels and potential damage zones under the action of impact. Particularly, the assumption of considering first-order collisions between oncoming and rebounding jet particles is re-examined. The influence of repeated collisions on energy transferred to the surface was found to be significant under conditions which involves high particle numbers or fluxes, and also high degrees of inelasticity. The overall trends for parametric variations were found to be in accordance with reported trends in the literature.
KeywordsGranular jet Solid particle erosion Collisions Discrete element method Interference effect
This work was partly supported by Siemens Energy, and the authors would like to thank them for their support. The work has not been published in any other journal prior to this. There were no study participants involved in this work, as the work was purely computational. The authors also declare that they have no conflict of interest.
- 5.Bitter, J.G.A.: A study of erosion phenomena. Part I. Wear 6(1), 5–21 (1963)Google Scholar
- 11.Chen, X., Wang, R., Yao, N., Evans, A.G., Hutchinson, J.W., Bruce, R.W.: Foreign object damage in a thermal barrier system: mechanisms and simulations. Mater. Sci. Eng. A 352(1–2), 221–231 (2003)Google Scholar
- 18.Frenkel, D., Smit, B.: Understanding Molecular Simulation: From Algorithms to Applications. Academic Press (2001)Google Scholar
- 27.Johnson, K.L.: Contact Mechanics. Cambridge University Press, Cambridge (1987)Google Scholar
- 28.Lemaitre, J., Desmorat, R.: Engineering Damage Mechanics: Ductile, Creep, Fatigue and Brittle Failures. Springer, Berlin (2005)Google Scholar
- 42.Pöschel, T., Schwager, T.: Computational Granular Dynamics: Models and Algorithms. Springer, Berlin (2005)Google Scholar
- 44.Shäfer, J., Dippel, S., Wolf, D.E.: Force schemes in simulations of granular materials. J. Phys. I 6(1), 5–20 (1996)Google Scholar
- 54.Wriggers, P., Zavarise, G.: Computational Contact Mechanics. Springer, Berlin (2002)Google Scholar
- 57.Zohdi, T.I.: On the tailoring of microstructures for prescribed effective properties. Int. J. Fract. 118(4), 89–94 (2002)Google Scholar
- 58.Zohdi, T.I.: An introduction to modeling and simulation of particulate flows. In: Computational Science and Engineering, vol 4. Siam, Philadelphia (2007)Google Scholar