Week 7-Long Piston With Cam

Objective: To perform a transient analysis on a piston and cam mechanism model and do the analysis with Frictionless contact, Frictional with 0.1 and 0.2 as the frictional contact for a total of 3 cases.

Calculate Equivalent Stress, Directional Deformation and Equivalent Elastic Strain and compare them for all the three cases

Setup:

Engineering data:

Structural steel material

Geometry:

• exported file of Long_piston_cam.x_t

Model:

Geometry: Renamed as Barrel, Barrel_Cam, Cam follower. Stiffness behaviour: rigid for Barrel, Barrel_Cam.

Coordinate system: no change

Connections:

Contacts:

• frictional- Cam follower to Barrel, COF: 0
• Frictional- Cam follower to Barrel cam, COF: 0

Joints:

• Fixed- ground to Barrel
• Revolute- ground to Barrel cam
• Translational- Barrel to Cam follower (body to body)

Mesh:

• Face sizing: 3mm mesh to 7 faces in contact where analysis is important.
• Use adaptive sizing: No.

Static structural:

• Analysis setting:

For first step:

1. Number of steps =9
2. Current step number= 1
3. Auto time stepping= on
4. Large deflection: on
5. Output controls: All yes, Contact miscellaneous: no

For remaining steps:

1. Number of steps =9
2. Current step number= multi step
3. Auto time stepping= on
4. Minimum time step= 5.e-002 s
5. Maximum time step = 0.3 s
6. Large deflection: on
7. Output controls: All yes, Contact miscellaneous: no

• Joint-Rotation: Revolute- ground to barrel cam

Solution:

Case: 1 Frictionless
Coefficient of friction: 0

1) Directional Deformation

2) Equivalent Elastic Strain

3) Equivalent Stress

For remaining Cases using parameter Set

Case: 2 Frictional
Coefficient of friction: 0.1

Case: 3 Frictional
Coefficient of friction: 0.2

Tabular data