Page 695 - 02. Subyek Computer Aided Design - Beginner’s Guide to SOLIDWORKS 2019- Level 1 by Alejandro Reyes

Analysis: SimulationXpress

This approach is enough for simple analyses, but to obtain a more accurate

and reliable solution, a more realistic simulation must be used that allows selective

displacement and rotation of element nodes.

After we know how the model is supported, we need to define the Loads

(forces) that act upon it. A limitation of SimulationXpress is that it only allows

Forces and Pressures to be applied to model faces. We can define the Loads to

be normal to the face they are applied to or perpendicular to a reference plane.

Another limitation of SimulationXpress is it can only make Linear Static

Stress Analysis. Stress is defined as the internal resistance of a body when it is

deformed and is measured in units of Force divided by Area. For example, if we

2
load a bar with a 1 in cross section area with a 1 Lb. load, we'll have a stress of 1

2
Lb/in . The stress depends on the forces and the geometry regardless of the

material used. The material properties will make a difference as the model will

deform more or less.

The "Static" part means the model is immovable; in other words, the

restraints will not let the model move when the loads are applied; loads and

restraints are in equilibrium, otherwise the analysis would be "Dynamic."

The "Linear" part implies the deformation of the model is proportional to the

forces applied; twice the force, twice the deformation. These deformations are

generally small compared to the overall size of the part and occur in the Elastic

region of the "Stress-Strain" curve of the material used. If we remove the force, the

model returns to its original shape like a spring.

In general terms, the Yield

Stress is the point where the stress- Stress-Strain curve

strain curve is no longer linear. If a

material is stressed beyond the Yield Ultimate Stress
Stress
Stress it will be permanently /
Yield Stress
deformed. In this case, we will have

Plastic Deformation. Thinking of

the spring, if we pull the spring too

far, it will be permanently deformed,
.. - Elastic Limit \
meaning it had plastic deformation. Breaking Stress

If the material's yield stress is I
I

exceeded with the applied loads, I
I

the SimulationXpress analysis I
I
I
results will be invalid. If this is the I

I
case, we will need to change our I

I
design, its geometry, the loads
I

applied, or material used to have Elastic I Strain

stress results below the material's Deformation 1 Plastic Deformation

yield stress.

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