
Can shear stress be trusted?
Chad Schmidt Mar 6, 2009 2:10 PM (in response to Chad Schmidt)This is gettin worse! I looked at the vectors on a normal X plot and none of the vectors line up with the X direction. Can someone please explain to me what I'm not understanding here? 
Can shear stress be trusted?
1DEXHLY Mar 6, 2009 6:38 PM (in response to Chad Schmidt)Would you please upload your file?
It is the only way to check. Few times I had a similar problem doing structural analysis on frames (using weldments in SW). Check with a Free Body Diagram if the information given out are the same. 
Can shear stress be trusted?
1I7AP5K Mar 6, 2009 10:38 PM (in response to Chad Schmidt)Hi Chad,
Maybe I've misunderstood something, so please correct me if I'm wrong.
You're working on the YZ plane and we select Y as being horizontal for the sake of discussion and Z is vertical. Your vectors are collinear (coplanar ?) with the plane and parallel to Z (vertical). If you're viewing this arrangement from a position perpendicular to Z, you must be at either +X or X. Doesn't that mean that your vectors should be pointing either straight up or straight down (+Z or Z)?
Can shear stress be trusted?
Chad Schmidt Mar 7, 2009 12:30 PM (in response to 1I7AP5K)I would expect vectors to be some form of coplanar and parallel to some axis and plane. But that is where the problem is exactly. If you choose any shear stress vector plot they seem to be pointing in various directions. suppose I pick TXZ then they better all be pointing parallel with the of Z axis! See the following PDF
http://etidweb.tamu.edu/ftp/EN...ture%20NotesRKII.pdf
look at pages 12 and 19. Notice these are not resultant components but components of the axis and plane they're referencing!


Re: Can shear stress be trusted?
Keith Frankie Apr 25, 2014 3:48 PM (in response to Chad Schmidt)I was confused about this also. I sent SW an example file and recieved the following logical explination:
Thank you for contacting SolidWorks Technical Support. My understanding of how the vectors are plotted for shear stress is that SOLIDWORKS points them in directions perpendicular to the shear stress directions.
So for TXY=TYX, the shear stress pair you noted, are in the Ydirection (YZ plane) and Xdirection (XZ) plane. Therefore, to represent these shear directions, it shows the vector in the third direction perpendicular to the two, which is the Z direction. Similar TXZ=TZX will be plotted in the Y direction, and TYZ=TZY will be plotted in the X direction. 
Re: Can shear stress be trusted?
Jared Conway Apr 26, 2014 2:08 AM (in response to Chad Schmidt)To get your head wrapped around it , I would recommend generating a model with a known result and posting some screenshots of the results and what you expect. I suspect it is as noted above that your expectations aren't matching what is done.