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Luis You are right. If you want to find out more about stress, look at the following web page: http://en.wikipedia.org/wiki/Stress_%28mechanics%29 There are enough nice color diagrams, arrows, equations, matrices, and explanations to keep one busy all day. It covers most anything you would want to know about stress and is truly well done. Dennis >El 28/09/2011, a las 09:17, D. Mukhopadhyay escribió: > >> Stress across a particular surface is a >>vector; stress at a point connotes surface >>stresses on planes of all possible orientations >>passing through the point; it is a symmetric >>tensor of 3rd rank. > >If I am not wrong (wouldn't be the first time, >nor the last), stress is a second order tensor, >not third. > >All the best! > > >______________________________ >Dr. Luis Arlegui >Area de Geodinámica Interna >Dpto. Ciencias de la Tierra >Universidad de Zaragoza >[log in to unmask] -- ----------- Dr. Dennis Brown Instituto de Ciencias de la Tierra "Jaume Almera" c/Lluis Sole i Sabaris s/n 08028 Barcelona Spain Tel: 34 93 409 54 10 Fax: 34 93 411 00 12 e-mail: [log in to unmask] http://wija.ija.csic.es/gt/dennisbrown/ http://www.ija.csic.es/gt/IGCP524