## General Mechanical

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

• Jia-Wei Liao
Subscriber

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 positive 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 negative 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?

• Sahil Sura
Ansys Employee

Hello Jia-Wei Liao,
There can be ways to simulate this boundary condition. Some of them can be as follows-

Displacement, Remote Displacement – You can define the displacement, and set/restrict for the body. If you are planning to scope the boundary condition to the half section (as shown by the red line) you might need to split the face or select the elements and create a named selection.
You can get more details on the same from the following resources-
Displacement (ansys.com)
Structural Boundary Conditions – ANSYS Innovation Courses

Another approach that I would plan for the simulation if the loads, boundary conditions, and materials are symmetric about the axis is an approach of planar symmetry. (Involves a bit of geometry pre-processing)
This would help you restrict the motion about the given plane of symmetry, (Frictionless support may also seem a great approach for the time, just visualization of results in extended form won’t be possible)
For more details please check the following resources-
Symmetry (ansys.com)
Understanding when to Take Advantage of Symmetry – Lesson 3 – ANSYS Innovation Courses

Hope this helps!

Thanks,

Sahil

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