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# Boundary condition for Shear stress analysis

## Boundary condition for Shear stress analysis

(OP)

In this model I have given shear displacement. Boundary condition (BC) D is 0.5 mm displacement in X direction, BC B is 0.5 mm displacement in Z direction. BC A is displacement constraint in Z direction, BC C displacement constraint in X direction. What should be the BC for Y direction faces? I want to calculate reaction force from the nonzero shear displacement which I have given because I want to calculate shear modulus.
Replies continue below

### RE: Boundary condition for Shear stress analysis

Boundary conditions must be sufficient to ensure the model remains in equilibrium for all externally applied loads.

#### Quote (Rajnan07)

BC A is displacement constraint in Z direction, BC C displacement constraint in X direction.

(BC) A and (BC) C cannot constrain rotation about the Z and X axes respectively, unless they are fixed against rotation.

The support conditions shown below provide boundary conditions which ensure equilibrium, regardless of the direction of applied forces. There are numerous other possibilities.

Finally, if you measure displacement of a model at various points, you cannot distinguish between shear displacement and bending or axial displacement, so it is not possible to calculate the shear modulus from such measurements.

BA

### RE: Boundary condition for Shear stress analysis

I don't trust that site, hajjy. Can you summarize what it says?

BA

### RE: Boundary condition for Shear stress analysis

hajjy is spamming other postings. Flagged

Politicians like to panic, they need activity. It is their substitute for achievement.

### RE: Boundary condition for Shear stress analysis

I found the handbook on the internet, with the following warning:

#### Quote (McGraw-Hill)

McGraw-Hill books are available at special quantity discounts to use as premiums and sales promotions, or for use in
McGraw-Hill, Two Penn Plaza, New York, NY 10121-2298. Or contact your local bookstore.
Handbook of Civil Engineering Calculations, Second Edition
of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval
system, without the prior written permission of publisher.

To quote from this book would be a violation of Copyright Act of 1976, so I won't do that. In any event, it is quite clear that Rajnan07 (the OP) is posing a question which is impossible to answer. The boundary conditions are not sufficient to ensure equilibrium and shearing deformation at any given point cannot be established by measurement or by calculation.

BA

### RE: Boundary condition for Shear stress analysis

hi..i think you are talking about boundary condition of shear stress analysis.i think there is enough data on google.

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