ACP Stress Analysis — Questions and Answers
Question 1: What type of analysis does Inventor Stress Analysis perform?
- Thermal cycling simulation
- Linear static finite element analysis (FEA) to predict stress, displacement, and safety factor (Correct answer)
- Fluid dynamics simulation
- Electromagnetic field analysis
Correct answer: Linear static finite element analysis (FEA) to predict stress, displacement, and safety factor
Inventor Stress Analysis performs linear static FEA, calculating stress distribution, displacement, and safety factors under applied loads and constraints.
Question 2: What is the von Mises stress in Inventor Stress Analysis results?
- Maximum principal stress only
- A combined stress measure that predicts yielding under complex stress states (Correct answer)
- The average stress across the entire part
- Stress at the center of gravity only
Correct answer: A combined stress measure that predicts yielding under complex stress states
Von Mises stress combines all stress components into a single equivalent value that can be compared to the material yield strength to predict yielding.
Question 3: Why is mesh refinement important in Inventor FEA?
- It makes the model look smoother
- Finer mesh in critical areas produces more accurate stress results at the cost of computation time (Correct answer)
- Mesh refinement is purely cosmetic
- It reduces file size
Correct answer: Finer mesh in critical areas produces more accurate stress results at the cost of computation time
Mesh refinement increases element density in areas of interest, improving result accuracy particularly around stress concentrations, at the expense of longer solve times.
Question 4: What are boundary conditions in Inventor Stress Analysis?
- The physical dimensions of the part
- Constraints and loads applied to the model that define how it is supported and loaded (Correct answer)
- Material property specifications
- Display settings for results
Correct answer: Constraints and loads applied to the model that define how it is supported and loaded
Boundary conditions include both constraints (how the part is held) and loads (forces, pressures, moments applied) that define the analysis scenario.
Question 5: What does a safety factor below 1.0 indicate in Inventor Stress Analysis?
- The design is adequate
- The stress exceeds the material yield strength, indicating likely failure (Correct answer)
- The mesh needs refinement
- The analysis has an error
Correct answer: The stress exceeds the material yield strength, indicating likely failure
A safety factor below 1.0 means the predicted stress exceeds the material's yield strength in that region, indicating the design may fail under the applied loads.
Question 6: How does Inventor handle contact between parts in assembly stress analysis?
- It ignores all contacts
- It detects contacting faces and applies bonded, sliding, or separation contact conditions (Correct answer)
- Contacts are only simulated in motion studies
- All parts are treated as a single body
Correct answer: It detects contacting faces and applies bonded, sliding, or separation contact conditions
Inventor automatically detects contacting faces between parts and allows setting contact type (bonded, sliding, or separation) to model the physical interaction.
ACP Stress Analysis
What type of analysis does Inventor Stress Analysis perform?