Finite Element Analysis Using NX 12 Project 3

Objective

Structural analysis of a rocker arm.

Modeling

Model the following part using NX (Unit: Inch)

​

Finite Element Analysis

Material properties:

  • Young’s modulus: 3.0 × 107 psi
  • Poisson’s ratio: 0.29
  • Mass density: 7.35 × 10-4 slug/in3 (unit conversion may be needed)

Mesh the rocker arm using the following attributes as four different cases:

  1. Tetra 4 elements, element size – 0.2
  2. Tetra 4 elements, element size – 0.05
  3. Tetra 10 elements, element size – 0.2
  4. Tetra 10 elements, element size – 0.05

Boundary conditions:

Fix both the counter bore hole and the counter sunk hole (i.e. fix the cylindrical faces) as shown in the figure below

Apply a pressure load of magnitude 600 psi normal to the face shown

For each of the four cases, obtain the deflection and Von-Mises stress

What to submit?

A written report containing the following for the four cases.

  • Meshed solid
  • Magnitude of deflection contour
  • Von-Mises stress contour
  • Brief answers to the following questions:
    • What are the maximum deflection and the maximum stress for each of the four cases?
    • Which of the four cases provides the most accurate results?
    • How are the FEA results affected by the type element and the element size?

How to submit?

  • Submit your project report to the corresponding module on Canvas (use your last name to name the file, such as Lastname_Project1. Do not use generic names like project1).