1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Definition of the Lagrangian finite strain tensor

  1. Sep 3, 2010 #1
    The Lagrangian finite strain tensor is defined as:

    [tex]E_{i,j}=\frac{1}{2}\left(\frac{\partial x_k}{\partial X_i}\frac{\partial x_k}{\partial X_j}-\delta _{i,j}\right)[/tex]

    Is it in Einstein Notation so that there is a summation symbol missing, i.e. would it be the same thing if one wrote it as:

    [tex]E_{i,j}=\frac{1}{2}\left(\sum _k \left(\frac{\partial x_k}{\partial X_i}\frac{\partial x_k}{\partial X_j}\right)-\delta _{i,j}\right)[/tex]

    It's that there is too many indices in mechanics, and it always gets me confused. Thanks a lot! :smile:
    Last edited: Sep 3, 2010
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted

Similar Threads - Definition Lagrangian finite Date
B Definition of transmission & reflection in TE/TM Feb 12, 2018
I Hamiltonian and Lagrangian in classical mechanics Dec 14, 2017
B Heat Definition Jul 17, 2017
I Definition of efficiency of a thermodynamic cycle Mar 28, 2017