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MD simulations of near surface void in copper under thermal compression

  • Aarne S. Pohjonen (a1), Flyura Djurabekova (a1) and Antti Kuronen (a2)

Abstract

Dislocation mediated mechanism of surface deformation due to localized stress and strain concentration near a void could give an explanation of field enhancement in conditions relevant to the design of rf accelerating structures of the Compact Linear Collider (CLIC). We have performed molecular dynamics simulations of a near surface void in copper under thermal stressing conditions. The von Mises strain was observed to be concentrated near the void surface with the maximum strain concentration factor of 1.9. To observe the activated slip-planes, we exaggerated the compressive stress to the extent that the dislocations were nucleated on the void surface at sites where von Mises strain was largest. Void depth and size were found to affect the dislocation nucleation. The nucleation was easier for larger voids and for voids which were closer to the surface.

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[1]: Heikkinen, S., Thermally induced ultra high cycle fatigue of copper alloys of the high gradient accelerating structures, (Helsinki University of Technology Doctoral Theses in Materials and Earth Sciences, TKK-ME-DIS-10, Espoo, 2010), http://lib.tkk.fi/Diss/ p. 92
[2]: Goto, M., Han, S. Z., Yakushiji, T., Lim, C. Y., Kim, S. S., Formation process of shear bands and protrusions in ultrafine grained copper under cyclic stresses, Scripta Materialia 54 (2006) 21012106
[3]: Nemat-Nasser, S., Hori, M., Void collapse and void growth in crystalline solids, J. Appl. Phys. 62 (1987), No. 7, p. 27462757
[4]: Nemat-Nasser, S., Chang, S-N, Compression-induced high strain rate void collapse, tensile cracking, and recrystallization in ductile single and polycrystals, Mechanics of Materials 10 (1990) 0167-6636, p. 117
[5]: Pohjonen, A. S., Djurabekova, F., Nordlund, K., Kuronen, A., Fitzgerald, S. P., Dislocation nucleation from near surface void under static tensile stress in Cu, J. Appl. Phys. 110 (2011) 023509
[6]: Wilson, P. B., RF breakdown in accelerator structures: from plasma spots to surface melting, Proceedings of LINAC 2004, Lübeck, Germany, SLAC-PUB-11806 March 2005
[7]: Boxman, R. L., Sanders, D. M., Martin, P. J., Handbook of vacuum arc science and technology (Noyes Publications, New Jersey, 1995) p. 32
[8]: Duan, H. L., Wang, J. and Karihaloo, B. L., Theory of Elasticity at the Nanoscale, Advances in Applied Mechanics, Vol. 42 (2008) p. 20
[9]: Suresh, S., Fatigue of materials, 2 nd edition (Cambridge University Press, Cambridge, 2003)
[10]: Roark, R. J., Young, W. C. Formulas for Stress and Strain, (McGraw-Hill Kogakusha, LTD, Tokyo, 1975, International Student Edition, 5. edition), p. 583
[11]: Plimpton, S. J., Fast Parallel Algorithms for Short-Range Molecular Dynamics, J Comp Phys, 117, 119 (1995)
[12]: Sabochick, M. J. and Lam, N. Q., Phys. Rev. B 43, 5243 (1991)
[13]: Hahn, T. A., Thermal Expansion of Copper from 20 to 800 K – Standard Reference Material 736, Journal of Applied Physics, Vol. 41, Number 13, 1970
[14]: Esser, H., Eusterbrock, H., Arch. Eisenhuttenw. 14, 341 (1941)
[15]: Lifanov, I. I. and Sherstyukov, N. G., Meas. Tech. (USSR) 12, 1653 (1968)
[16]: Berendsen, H. J. C., Postma, J. P. M., van Gunsteren, W. F., DiNola, A., Haak, J. R., J Chem Phys, 81, 3684 (1984).
[17]: Stukowski, A., Visualization and analysis of atomistic simulation data with OVITO – the Open Visualization Tool, Modelling Simul. Mater. Sci. Eng., 18, 015012
[18]: Hayes, R. L., Ho, G., Ortiz, M. and Carter, E. A., Prediction of dislocation nucleation during nanoindentation of Al3Mg by the orbital-free density functional theory local quasicontinuum method, Philosophical Magazine, Vol. 86, No. 16 (2006) 23432358
[19]: Callister, W. D. Jr., Materials Science and Engineering, 4 th edition (John Wiley & Sons, Inc. p.114)
[20]: Nye, J. F., Physical Properties of Crystals (Oxford at the Clarendon Press) p. 145

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