File talk:Mohr Circle plane stress (angle).svg

hey there

I think there is a mistake in Figure 9.1. Mohr's circle for a plane stress condition

by looking at the stress state on the plane D, one could conclude that there is a tensile stress (thus shown on positive side of mohr circle) and a counterclock-wise shear stress which indicates a negative sign on the mohr circle, so Point D on the circle should be moved to the lower limit of the circle

Rouzbeh Roudgari

I believe this is because the $\tau$ axis is labelled incorrectly, the traditional way to set up mohr's circle has it positive downward so that the $2\theta$ on the diagram corresponds to the same direction on as on diagrams etc. (Mechanics of Materials (7th ed) James M Gara snd Barry J Goodno section 7.4). Aamackie (talk) 21:52, 30 May 2010 (UTC)