Physics Help Forum Maximum shear stress in mohr's circle

 Dec 16th 2016, 04:58 AM #1 Senior Member   Join Date: Jun 2014 Posts: 306 Maximum shear stress in mohr's circle I am not sure how to get the maximum shear force in mohr's circle To get the $$\theta_(max)$$ θsmax , we have to 'turn' the B to $$\tau_(max)$$ τmax , right ? So , it should be like this ( in the figure , orange arrow) ? Am i right ? Since at A , the shear stress is negative , we can only get the minimum shear stress by 'rotating ' the A to $$\tau_(min)$$ τmin ? It 's not possible to get the maximum shear stress like the author do at point A , right ? Last edited by ling233; Dec 16th 2016 at 05:05 AM.
 Dec 16th 2016, 05:00 AM #2 Senior Member   Join Date: Jun 2014 Posts: 306 images here Attached Thumbnails
 Dec 17th 2016, 02:30 AM #3 Senior Member   Join Date: Jun 2014 Posts: 306 Bump
 Dec 17th 2016, 02:31 AM #4 Senior Member   Join Date: Jun 2014 Posts: 306 bump
 Dec 19th 2016, 06:29 AM #5 Senior Member   Join Date: Jun 2014 Posts: 306 Bump
 Jan 15th 2017, 09:44 AM #6 Senior Member   Join Date: Jul 2009 Location: Kathu Posts: 131 Maximum shear stress in mohr's circle This example is correct. Mohr circle takes a clockwise direction as positive and the positive direction of shear stress is downwards (Mechanical Engineering convention). All angles are taken from A which is at zero degrees. A check is that the principle stresses are perpendicular and that maximum shear stresses are 45 degrees from the principle stresses.

 Tags circle, maximum, mohr, shear, stress