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Home Páginas Investigadores Fernando Lund P.
Fernando Lund P.

E-Mail: flund@dfi.uchile.cl

Dirección: Av. Blanco Encalada 2008, Piso 1

Fono: 978 4854

Página Web:

Jerarquia y Cargo: Profesor Titular

Líneas de Investigación :

Research Lines:

Física de materiales con énfasis en sus propiedades mecánicas.

La figura de la derecha muestra el patrón de interferencia entre una onda elástica que incide sobre una dislocación, y la onda escatereada por dicha dislocación, en un medio elástico continuo. La comprensión detallada de este fenómeno es parte de un programa orientado a desarrollar modelos cuantitativos predictivos para el comportamiento plástico de metales y aleaciones.

La descripción teórica de estos fenómenos ha sido desarrollada en colaboración con F. Barra (DFI), A. Maurel (ESPCI, Paris, Francia) y V. Pagneux (LAUM, Le Mans, Francia), entre otros. N. Mujica (DFI) ha desarrollado experimentos usando Espectroscopía de Resonancia Ultrasónica (RUS). A. Zúñiga (DIMec) y R. Espinoza (DCM) realizan mediciones de microscopía electrónica de alta resolución (HRTEM), así como difracción de rayos X (DRX), como parte del proceso de validación de los resultados.

 

Materials physics, especially mechanical properties.

The figure on the right shows the interference pattern between an elastic wave that is incident upon a dislocation, and the wave that is scattered by said dislocation within a continuous elastic medium. The detailed understanding of this phenomenon is part of a program that aims at developing predictive quantitative models for the plastic behavior of metals and alloys.

The theoretical description of these phenomena has been developed in collaboration with F. Barra (DFI), A. Maurel (ESPCI, Paris, Francia) and V. Pagneux (LAUM, Le Mans, Francia), among others. N. Mujica (DFI) has developed Resonant Ultrasound Spectroscopy (RUS) experiments. A. Zuniga (DIMec) and R. Espinoza (DCM) perform High Resolution Transmission Electron Microscopy (HRTEM) as well as X-ray diffraction (XRD)  measurements as part of the results validation process.

 

Publicaciones Recientes:

99. S. Giri, F. Lund, A. Núñez, and A. Toro-Labbé, "Can Star-like C6Li6 beb Treated as a Potential H2 Storage Material?", J. Phys. Chem. C 117, 5544 (2013).

 

98. S. Giri, E. Etchegaray, P. Ayers, A. Núñez, F. Lund and A. Toro-Labbé, "Insights into the Mechanism        of a SN2 Reaction from the Reaction Force and the Reaction Electronic Flux", J. Phys. Chem A 116, 10015 (2012).

 

 97. N. Mujica, M. T. Cerda, R. Espinoza, J. Lisoni and F. Lund, “Ultrasound as a probe of dislocation density in aluminum”. Acta Mater. 60,5828 (2012).

 

96. A. Maurel, F. Lund, V. Pagneux, and F. Barra, “Interaction of Elastic Waves with Dislocations”, MRS Proceedings, 1404, mrsf11-1404-w02-05 doi:10.1557/opl.2012.341. 

 

URL = {http://journals.cambridge.org/article_S1946427412003417}

 

95. F. Barra, F. Lund, N. Mujica and S. Rica, ”Shear modulus of an elastic solid under    external pressure: The case of helium”. Phys. Rev. B 85, 064103 (2012).

 

94. D. Asenjo, F. Lund, S. Poblete, R. Soto and M. Sotomayor, "Characterization of the Melting Transition in two Dimensions at Vanishing External Pressure Using Molecular Dynamics Simulations", Phys. Rev. B 83, 174110 (2011).

 

93. A. Maurel, V. Pagneux, F. Barra, and Lund, F., “Reply to Comment on Interaction of a Surface Wave with a dislocation”, Phys. Rev. B 80, 136102 (2009).

 

92. A. Maurel, V. Pagneux, F Barra, and Lund, F., “Surface acoustic waves in interaction with a dislocation”, Ultrasonics 50, 161 (2010).

 

91. N. Rodríguez, A. Maurel, V. Pagneux, F. Barra and F. Lund, “Interaction between elastic waves and prismatic dislocation loops”, J. Appl. Phys. 106, 054910 (2009).

 

90. F. Barra, A. Caru, M. T. Cerda, R. Espinoza, A. Jara, F. Lund and N. Mujica, “Measuring dislocation density in aluminum with resonant ultrasound spectroscopy”, Int. J. Bifurc. Chaos 19, 3561 (2009).

 

89. A. Maurel, V. Pagneux, F. Barra and F. Lund, “Ultrasound as a probe of plasticity? The interaction of elastic waves with dislocations” Int. J. Bifurc. Chaos 19, 2765 (2009).

 

87. A. Maurel, V. Pagneux, F. Barra and F. Lund, “Interaction of a surface wave with a dislocation” Phys. Rev. B 75, 224112 (2007).

 

86. A. Maurel, V. Pagneux, F. Barra and F. Lund, “Multiple scattering from assemblies of dislocation walls in three dimensions. Application to propagation in polycrystals”, J. Acoust. Soc. Am. 121, 3418 (2007).

 

84. A. Maurel, V. Pagneux, F. Barra and F. Lund, “Wave propagation through a ran­dom array of pinned dislocations: Velocity change and attenuation in a generalized Granato and L¨ucke theory”, Phys. Rev. B 72, 174111 (2005).

 

83. A. Maurel, V. Pagneux, F. Barra and F. Lund, “Interaction between an elastic wave and a single pinned dislocation”, Phys. Rev. B 72, 174110 (2005).

 

82. A. Maurel, V. Pagneux, D. Boyer and F. Lund, “Elastic wave propagation through a distribution of dislocations”, Mater. Sc. Engin. A 400-401, 222 (2005).

 

81. A. Maurel, J.-F. Mercier and F. Lund, “Elastic wave propagation through a random array of dislocations”, Phys. Rev. B 70, 024303 (2004).

 

80. A. Maurel, J.-F. Mercier and F. Lund, “Scattering of an elastic wave by a point dislocation”, J. Acoust. Soc. Am. 115, 2773 (2004).

 

78. F. Petrelis and F. Lund, “On the scattering of sound by a magnetic field in an MHD fluid”, Eur. Phys. J. B 35, 291 (2003).

 

77. F. Lund, “Sound vortex interaction in infinite media”, in Sound-Flow Interaction, edited by Y. Aur´egan, A. Maurel, V. Pagneux and J.-F. Pinton, Lecture Notes in Physics 586 (Springer-Verlag, 2002).

 

76. R. Bernal, C. Coste, F. Lund and F. Melo, “Normal mode vortex interactions”, Phys. Rev. Lett. 89, 034501 (2002).

 

74. F. Vivanco, F. Melo, C. Coste and F. Lund, “Surface wave scattering by a vertical vortex and the symmetry of the Aharonov-Bohm wave function” Phys. Rev. Lett. 83, 1966 (1999). 

 

72. C. Coste and F. Lund, “Scattering of dislocated wavefronts by vertical vorticity and the Aharonov-Bohm effect II: Dispersive case”, Phys. Rev. E 60, 4917 (1999).

 

71. C. Coste, M. Umeki and F. Lund, “Scattering of dislocated wavefronts by vertical vorticity and the Aharonov-Bohm effect I: Shallow water waves”, Phys. Rev. E 60, 4908 (1999).

 

70. M. Adda-Bedia, R. Arias, M. Ben Amar and F. Lund, “Dynamic instability of brittle fracture”, Phys. Rev. Lett. 82, 2314 (1999).

 

69. D. Boyer and F. Lund, “Propagation of acoustic waves in disordered flows composed of many vortices II: Examples”, Phys. Fluids 11, 3829 (1999).

 

68. D. Boyer, M. Baffico and F. Lund, “Propagation of acoustic waves in disordered flows composed of many vortices I: General aspects”, Phys. Fluids 11, 3819 (1999).

 

65. R. Arias and F. Lund, “Excitation of normal modes of a thin elastic plate by moving dislocations”, Wave Motion 29, 35 (1999).

 

64. R. Arias and F. Lund, “Elastic fields of stationary and moving dislocations in three dimensional finite samples”, J. Mech. Phys. Solids 47, 817 (1999). 

 

62. C. Conca and F. Lund, “Fourier space homogenization and the propagation of acous­tic waves through a periodic vortex array”, SIAM J. Appl. Math. 59, 1573 (1999).

 

67. F. Lund, “Sound and Fracture”, Science, 279, 1652 (1998).

 

61. M. Baffico, D. Boyer and F. Lund, “Propagation of acoustic waves through a system of many vortex rings”, Phys. Rev. Lett. 80, 2590 (1998).

 

60. M. Oljaca, X. Gu, A. Glezer, M. Baffico and F. Lund, “Ultrasound scattering by a swirling jet”, Phys. Fluids A 10, 886 (1998).

Proyectos Recientes:

ANR-CONICYT 38 "Wave propagation in complex media---PROCOMEDIA". Co-Investigator (Co-Directors: F. Barra and A. Maurel).  

FONDECYT 1100198 "Ultrasonic probing of dislocations in materials". Principal Investigator.

ACT 127 "Dynamics of disordered and heterogeneous media". Main Researcher (Director: N. Mujica).

FONDECYT 16060005 "Unidad de generación de negocios CIMAT". Director.

FONDECYT 17070002 "Apoyo a la investigación de biocompatibilización de nanopartículas metálicas mediante el uso de polímeros (CIMAT)". Director.  

FONDAP 11980002 "Center for advanced interdisciplinary research in materials---CIMAT". Director.

MECESUP UCH0205 "Red nacional de programas de doctorado en ciencias de materiales". Director.

FONDECYT 1990035 "Line defects in elastic solids: Dynamics and statistics". Principal Investigator. 


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Departamento de Fisica algunos derechos Reservados.