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Author: Ben Mullen, Cornell University
Problem Specification
1. Pre-Analysis & Start-Up
2. Geometry
3. Mesh
4. Setup (Physics)
5. Solution
6. Results
7. Verification & Validation
Setup (Physics)
Set Material Properties
Outer Surface
Because the thickness of the blade varies, we need to set the material via commands. First, we will create a command that governs the material properties of the outer surface of the blade. To create a command, right click on the Outer Surface surface body, and select Insert > Commands. In the command prompt, insert the following:
/prep7 !Call the Preprocessor
et,matid,181 !Specify the element type, shell 181
keyopt,matid,3,2 !Use full integration
mpdel,all,matid !Delete all previously assigned material properties
tbdel,all,matid !Delete all previouly assigned tabular data
MP,EX,1,33E9 !Define Young's Modulus: X Direction
MP,EY,1,33E9 !Define Young's Moduls: Y Direction
MP,EZ,1,33E9 !Define Young's Modulus: Z Direction
MP,PRXY,1,0.3 !Define Major Poisson's ratio XY
MP,PRYZ,1,0.3 !Define Major Poisson's ratio YZ
MP,PRXZ,1,0.3 !Define Majoy Poisson's ration XZ
Spar
Create a command for the spar, and insert the following
/prep7 !Call the Preprocessor
et,matid,181 !Specify the element type, shell 181
keyopt,matid,3,2 !Use full integration
mpdel,all,matid !Delete all previously assigned material properties
tbdel,all,matid !Delete all previouly assigned tabular data
MP,EX,2,101E9 !Define Young's Modulus: X Direction
MP,EY,2,101E9 !Define Young's Moduls: Y Direction
MP,EZ,2,101E9 !Define Young's Modulus: Z Direction
MP,PRXY,2,0.3 !Define Major Poisson's ratio XY
MP,PRYZ,2,0.3 !Define Major Poisson's ratio YZ
MP,PRXZ,2,0.3 !Define Major Poisson's ration XZ
Setup Varying Thickness function
Outer Surface
Now, we need to set up the varying thickness function governing the blade's thickness. To do this, we will need to open ANSYS APDL. To open, go to Start > All Programs > ANSYS 13.0 > Mechanical APDL (ANSYS). Once ANSYS APDL opens, go to Parameters > Functions > Define/Edit. The function that will drive the thickness is 0.030 - 0.00048485X where X is the distance from the origin along the X-axis. In the Result text box, type .03 - 0.00048485*, then, to input the x variable, open the drop down menu next that is defaulted to Time and change it to X.
Press ENTER. Then in the Function Editor window, go to File > Save. Change the Save as type to All Files, and name the file vth.txt. Once you save, you may close ANSYS APDL. Now, open the text file you just created. We need to name the function. In the text file, use Replace to replace all instances of %_FNCNAME% with vth. Also, we need to alter the line {{