Blog posts

Baker Hughes has an opportunity for summer internship in the area of drilling mechanics and dynamics at Woodlands Technology Center, The Woodlands, Texas. The position is open to candidates in MS or PhD program in Mechanical/Civil/Aerospace/Mining engineering, Materials Science or relevant disciplines at a US University 

M.T. Hoang, J. Yvonnet, A. Mitrushchenkov, G. Chambaud, First-principles based multiscale model of piezoelectric nanowires with surface effecs, Journal of Applied Physics, 113(1):014309, 2013

http://jap.aip.org/resource/1/japiau/v113/i1/p014309_s1

Post-print :

http://hal-univ-mlv.archives-ouvertes.fr/docs/00/77/09/98/PDF/_39_Pre_P…

These notes are part of a course on advanced elasticity.  The notes recall several phenomena where both elasticity and surface energy are significant, including

• Griffith crack
• Adhesion of flexible structures
• Wafer bonding
• Contraction of a soft elastic sheet 

The notes also contain a formulation of combined surface energy and elasticity of finite deformation.  

Compatibility equations of elasticity are almost 150 years old. Interestingly they do not seem to have been rigorously studied for non-simply-connected bodies to this date. In this paper we derive necessary and sufficient compatibility equations of nonlinear elasticity for arbitrary non-simply-connected bodies when the ambient space is Euclidean. For a non-simply-connected body, a measure of strain may not be compatible even if the standard compatibility equations ("bulk" compatibility equations) are satisfied.