ACP ACP Inventor Nastran and Dynamic Simulation 2 — Questions and Answers
Question 1: In Inventor's Dynamic Simulation, what does the Output Grapher display?
- The mesh density across simulation time
- Plots of position, velocity, acceleration, and force results for joints and components over the simulation time (Correct answer)
- The von Mises stress distribution at each time step
- The assembly bill of materials for simulated components
Correct answer: Plots of position, velocity, acceleration, and force results for joints and components over the simulation time
The Output Grapher displays time-history plots of kinematic and force results (position, velocity, acceleration, reaction forces) for joints and bodies.
Question 2: What is the role of a 'contact constraint' in Inventor Nastran?
- It welds two surfaces together permanently
- It defines the interaction between two surfaces that may come into or separate from contact during loading (Correct answer)
- It applies a uniform pressure load to a surface
- It merges two mesh regions into one continuous mesh
Correct answer: It defines the interaction between two surfaces that may come into or separate from contact during loading
A contact constraint defines how two surfaces interact — whether they separate, slide, or bond — when loads are applied during the analysis.
Question 3: In Inventor's Dynamic Simulation environment, which load type represents the effect of Earth's gravity on all components?
- Force
- Gravity (Correct answer)
- Moment
- Pressure
Correct answer: Gravity
The Gravity load applies a gravitational acceleration vector to all bodies in the dynamic simulation, accounting for weight effects.
Question 4: What does a 'safety factor' result display in Inventor Nastran's linear static analysis?
- The ratio of applied load to the model's weight
- The ratio of material yield strength to the calculated von Mises stress at each location (Correct answer)
- The percentage of mesh elements that have converged
- The number of load steps used in the nonlinear solver
Correct answer: The ratio of material yield strength to the calculated von Mises stress at each location
Safety factor is calculated as material yield strength divided by local von Mises stress, indicating how close each point is to yielding.
Question 5: In Inventor's Dynamic Simulation, what must be done before exporting joint reaction forces to Inventor Nastran for FEA?
- Convert all joints to welds
- Run the dynamic simulation to generate force results, then use the Export to FEA command (Correct answer)
- Assign materials to all dynamic simulation components
- Create a drawing of each component before exporting
Correct answer: Run the dynamic simulation to generate force results, then use the Export to FEA command
The simulation must be run first to calculate joint reaction forces, which are then exported as loads into Nastran using the Export to FEA workflow.
Question 6: Which Inventor Nastran result type shows the maximum distortion energy stress used to predict yielding in ductile materials?
- Maximum Principal Stress
- Von Mises Stress (Correct answer)
- Tresca Stress
- Normal Stress
Correct answer: Von Mises Stress
Von Mises stress is derived from distortion energy theory and is the standard metric for predicting yielding in ductile metals.
ACP ACP Inventor Nastran and Dynamic Simulation 2
In Inventor's Dynamic Simulation, what does the Output Grapher display?