Bird Strike - Project - 2

Objectives:

1. Proper simulation of bird striking the blades and blade failure can be seen within a short span of time.

2. All the files should be seperately included in MAIN file.

3. Consistent numbering approach 100000+ for nodes, 500000+ for elements, and 1000+ for the parts should be followed.

4. Mass scaling is used to reduce the simulation time.

Procedure:

1. First we have to create a seperate files from the given bird_strike file. Four .k files are created which are Hub, casing, blades and bird.

2. Now numbering of all the nodes and elements are rearranged for better understanding.

For Nodes - 100000+

Elements - 500000+

Parts - 1000+

is used.

3. Now material and setion is assigned to all the for parts. For the blade material curve is given. So that is assigned using *INCLUDE command in blade file.

Material curve for blade.

4. Now a seperate control card file is created.

• Due to system processing limitations termination time of only 1ms is used.
• Bird is transformed closer to blades to reduce that impact time.
• Mass scaling is used to reduce the simulation time.

Contacts are defined bw parts:

• Two type of contacts are used which are single surface contact and surface to surface contact.
• Single surface contact is given between blades itself.
• Surface to Surface is given between casing & blade, blade & bird, bird & casing.

5. Now a MAIN.K file is created in which all the above subfile are called using *INCLUDE keyword.

6. Results

• As total energy is constant and kinetic is converted to internal, which means model is correct.

• Due to rotational velocity, there are stress in the blades before contact of bird.

Animation:

Problems faced during project:

• First I created a material and section file seperately, due to which I have to assign material and section everytime i opened the model. So to solve this I define the material and section with the Node and element file of each component or part, which sorted the issue.

Learning Outcomes:

• learnt how to handle a big model.
• learnt how to follow the sequence of node, elements & part for better understand of model.
• Learnt to call different subfiles to main file, which helps a lot to understand the error and warning.