Transient Structural Analysis of Slider Crank Mechanism Using ANSYS Workbench
Objective: Perform Transient Structural Analysis on Slider Crank Mechanism
Case 1: Using Structural Steel For all the Components and Assigning No Contact Region for the Model
Case 2: Create contacts between the various slider crank components and assign material properties to the geometry with frictional coefficient as per given below,
|
Geometry |
Materials |
Coefficient of friction |
|
Crank to Handle 1 |
Structural steel - Low Carbon Steel |
0.3 |
|
Handle 1 to Handle 2 |
Low Carbon Steel - Grey Cast iron |
0.23 |
|
Handle 2 to Fixture |
Grey cast iron - Grey cast iron |
0.15 |
Geometry
Materials
For Case1
- We use only Structural Steel for all Slider crank Components
For Case 2
- Low Carbon Steel-Handle 1
- Grey Cast Iron - Handle 2 and Fixture
Connections
- Contact
Case 1 as No Contact region
- Case2
- Crank - Handle 1
Type : Frictional
Frictional coefficient :0.3
- Handle 1- Handle 2
Type : Frictional
Frictional coefficient :0.23
- Handle 2 to Fixture
Type: Frictional
Frictional coefficient :0.15
Joint
For Both Cases Joints Connection are same
- Fixed Joint for the Fixture Component
Connection type : Body To Ground
- Revolute joint For the Crank Upper mount
Connection Type: Body to Ground
Behavior: Deformable
- Revolute joint for Handle1 to Crank lower mount
Connection Type: Body to Body
Reference: Handle 1
Mobile Reference: Crank
- Translational Joint for the Handle 2 to Handle1 along X-axis
Connection Type: Body to Body
Reference: Handle 2
Mobile Reference: Handle 1
- Translational Joint for the Fixture to Handle2 along X-axis
Connection Type: Body to Body
Reference: Fixture
Mobile Reference: Handle 2
Mesh
Element Size :8mm
Analysis Settings
Boundary Condition
- Joint Load For the Revolute Ground - Crank
Type Rotation
Solution Output:
Case1
Total Deformation(6.4585mm)
Equivalent Stress for Crank(0.99831MPa)
Total Velocity For the crank(139.63mm/s)
Case2
Total Deformation(7.0884mm)
Equivalent Stress for Crank(78.813MPa)
Total Velocity For the crank(139.43mm/s)
Contact Tool
- Frictional stress
For Contact region
- Crank - Handle 1
- Handle 2 to Fixture
The Frictional Stress is zero because there is gap between The Components , The contact Status For Both is only Near Not Sliding or Sticking so there will be no Frictional Stress Generated
For Contact Region
- Handle 1- Handle 2 (0.22451Mpa)
Conclusion :
- Because of the contact region and coefficient of friction Assigned between the components in case 2 that will be restrict the motion which will result in higher stress and higher deformation .
- Since case 1 doesn't have any contact region they moved freely without restriction thus it result in lesser deformation and lesser stress
- The component has only one true contact region which is contact between Handle 1- Handle 2 , so we can see the frictional stress in that region alone
- If they weren't any gap between the components, Crank - Handle 1 contact region would have higher frictional stress because the coefficient of friction is higher compare to other
ANSYS WORKBENCH FILE:
https://drive.google.com/open?id=1MWeZXzU90Kwta8mx9JdcVUUzWNpGDmDy