## General Mechanical

Topics relate to Mechanical Enterprise, Motion, Additive Print and more

#### Displacement seeting

• Jia-Wei Liao
Subscriber

Is there any way to set a surface that displace only in  x>0 not in x<0?

• Sampat Kumar
Ansys Employee

Hi
Will you please explain the question in a little bit of detail? please explain the question why you want to do it. Do you want to do it in the APDL or Ansys mechanical?

Regards,
Sampat

• Jia-Wei Liao
Subscriber

I apologize for the brevity of my previous response. I would like to simulate breast compression with a fixed lower plate and an upper plate that moves downwards to compress the breast. I want to ensure that the right side of the breast, represented by the red line, can only move in the negative x-axis direction during compression while being free to move in the y and z directions. Similarly, the left side of the breast, represented by the red line, can only move in the positive x-axis direction while being free to move in the y and z directions. I plan to perform this simulation in Ansys Mechanical.I would like to ask is there a way to set my above boundary conditions?

Regards,
Liao

• Sampat Kumar
Ansys Employee

Hi
For the above picture, you may try symmetry in the contact.

Regards,
Sampat

• Jia-Wei Liao
Subscriber

Sorry, I want to ask another question. In the initial boundary conditions, the surface of the breast is set to move freely in the x, y and z axis, but after starting the simulation, once the breast is in contact with the plate, the node where the breast is in contact with the plate It will only move in the  Z axis. I would like to ask how to do such a setting in ansys mechanical?

Regards,
Liao

• Sampat Kumar
Ansys Employee

Hi
As far as I can understand you don't want sliding in the x and y direction but want only movement in the Z direction. You can use rough contact that will not allow sliding movement when it will be in contact.

Regards,
Sampat