CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

shear stress

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 22, 2008, 04:57
Default shear stress
  #1
Mihail
Guest
 
Posts: n/a
Good day!

Would you be so kind helps me understand physical meaning of "shear stress", and "shear strain?"

Mihail
  Reply With Quote

Old   December 22, 2008, 06:00
Default Re: shear stress
  #2
charles
Guest
 
Posts: n/a
A shear stress, denoted (tau), is defined as a stress which is applied parallel or tangential to a face of a material, as opposed to a normal stress which is applied perpendicularly. In other words, considering that weight is a force, hanging something from a wall creates a shear stress on the wall, since the weight of the object is acting parallel to the wall, as opposed to hanging something from the ceiling which creates a normal stress on the ceiling, since the weight is acting perpendicular to the ceiling.

Shear strain is a strain that acts parallel to the surface of a material that it is acting on. Normal strain, in contrast, acts perpendicular to the surface. There are two ways to interpret shear strain: the average shear strain and the engineering shear strain. The variable used to denote average shear strain is while denotes engineering shear strain.

Consider an infinitesimal rectangle in the xy plane subject to shear strain. The rectangle becomes a parallelogram where is the displacement from the y axis in the x direction and is the displacement from the x axis in the y direction. The average shear strain is

[edit] Definition of engineering shear strain

where

is the angle before deformation and is the angle at that same point after deformation. Therefore describes the total deformation.

  Reply With Quote

Old   December 22, 2008, 06:50
Default Re: shear stress
  #3
Mihail
Guest
 
Posts: n/a
Dear Charles!

Thank you for so perfect explanation!

Maybe you can tell me meaning of "shear flow" and "shear layer".

Mihail.

  Reply With Quote

Old   December 22, 2008, 20:18
Default Re: shear stress
  #4
charles
Guest
 
Posts: n/a
Shear flow is:-

in a solid body, the gradient of a shear stress force through the body; in a fluid, it is the flow induced by such a force gradient - see Viscosity for a fuller treatment.

Shearing layers is a concept coined by architect Frank Duffy which was later elaborated by Stewart Brand in his book How Buildings Learn: What Happens After They're Built (Brand, 1994), and refers to buildings as composed of several layers of change.

  Reply With Quote

Old   December 23, 2008, 01:27
Default Re: shear stress
  #5
Mihail
Guest
 
Posts: n/a
thanks a lot!

Merry Christmas and a happy new year!
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shear Stress Calculation in the flow. auburnuser FLOW-3D 11 May 12, 2018 14:49
Fluid wall shear stress Sinead Kelly (Kelly) OpenFOAM Running, Solving & CFD 2 March 30, 2011 07:41
How to get shear stress all over the flow domain lingo FLUENT 2 November 3, 2003 22:16
shear stress scalar definitions? Novak Elliott CFX 0 April 6, 2003 02:45
What is the detail definition of wall shear stress zjm FLUENT 0 January 2, 2002 08:43


All times are GMT -4. The time now is 20:56.