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. 2014 Jun 10;5:265. doi: 10.3389/fpls.2014.00265

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Copyright © 2014 Hernández-Hernández, Rueda, Caballero, Alvarez-Buylla and Benítez.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Figure B2.1 — Principal planes. (A) A solid body subjected to uniaxial tension and the principal plane, which is parallel to the direction of applied force. All tangential or shear stresses are zero along this plane. (B) The plane that is perpendicular to the principal plane undergoes the maximal shear stresses generated by uniaxial stress σ_x.