CAD CAD Simulation and Analysis

Question 1

What type of analysis in CAD software divides a model into small elements to predict how it will respond to forces and loads?

Accepted Answer

Finite Element Analysis

Answer

Finite Element Analysis (FEA) divides a model into a mesh of small elements to calculate stress, strain, and deformation under applied loads.

Question 2

In FEA, what is the term for the network of small polygons or tetrahedra that covers the model surface or volume?

Accepted Answer

Mesh

Answer

The mesh is the discretized network of elements used by FEA solvers to approximate the physical behavior of the part.

Question 3

Which boundary condition is required in every FEA simulation to prevent the model from moving freely in space?

Accepted Answer

Fixed constraint

Answer

A fixed constraint (or fixture) is needed to restrain the model so the solver can calculate displacements relative to a stationary reference.

Question 4

In a CAD motion simulation, what property describes resistance to change in rotational velocity around an axis?

Accepted Answer

Moment of inertia

Answer

Moment of inertia measures how mass is distributed relative to a rotational axis and determines how much torque is needed to change angular velocity.

Question 5

What color is typically used on a von Mises stress plot to indicate regions of highest stress concentration?

Accepted Answer

Red

Answer

In the standard rainbow color scale for stress plots, red represents the highest stress values, alerting engineers to critical failure zones.

CAD - Computer-Aided Design Practice Test