Plane Stress Bracket
Verification Example
The first step is to simplify the problem. Whenever you are trying out a new analysis type, you need something (ie analytical
solution or experimental data) to compare the results to. This way you can be sure that you've gotten the correct analysis type,
units, scale factors, etc.
The simplified version that will be used for this problem is that of a flat rectangular plate with a hole shown in the following
figure:
ANSYS Command Listing
! Command File mode of 2D Plane Stress Verification
/title, 2D Plane Stress Verification
/PREP7 ! Preprocessor
BLC4,0,0,200,100 ! rectangle, bottom left corner coords, width, height
CYL4,100,50,20 ! circle,center coords, radius
ASBA,1,2 ! substract area 2 from area 1
ET,1,PLANE42 !element Type = plane 42
KEYOPT,1,3,3 ! This is the changed option to give the plate a
thickness
R,1,20 ! Real Constant, Material 1, Plate Thickness
MP,EX,1,200000 ! Material Properties, Young's Modulus, Material 1,
200000 MPa
MP,PRXY,1,0.3 ! Material Properties, Major Poisson's Ratio, Material
1, 0.3
AESIZE,ALL,5 ! Element sizes, all of the lines, 5 mm
AMESH,ALL ! Mesh the lines
FINISH ! Exit preprocessor
/SOLU ! Solution
ANTYPE,0 ! The type of analysis (static)
DL,4, ,ALL,0 ! Apply a Displacement to Line 4 to all DOF
SFL,2,PRES,-1 ! Apply a Distributed load to Line 2
SOLVE ! Solve the problem
FINISH
/POST1
PLNSOL,S,EQV
The first step is to simplify the problem. Whenever you are trying out a new analysis type, you need something
(ie analytical solution or experimental data) to compare the results to. This way you can be sure that you've
gotten the correct analysis type, units, scale factors, etc.
The simplified version that will be used for this problem is that of a flat rectangular plate with a hole shown in
the following figure:
KEYOPT,1,3,3 ! This is the changed option to give the plate a thickness
MP,EX,1,200000 ! Material Properties, Young's Modulus, Material 1, 200000
MP,PRXY,1,0.3 ! Material Properties, Major Poisson's Ratio, Material 1,
Introduction
This tutorial is the second of three basic tutorials created to illustrate commom features in ANSYS. The plane stress bracket
tutorial builds upon techniques covered in the first tutorial (3D Bicycle Space Frame), it is therefore essential that you have
completed that tutorial prior to beginning this one.
The 2D Plane Stress Bracket will introduce boolean operations, plane stress, and uniform pressure loading.
Problem Description
The problem to be modeled in this example is a simple bracket shown in the following figure. This bracket is to be built from a
20 mm thick steel plate. A figure of the plate is shown below.
This plate will be fixed at the two small holes on the left and have a load applied to the larger hole on the right.
! Command File mode of 2D Plane Stress Bracket
/title, 2D Plane Stress Bracket
/prep7 ! Enter the pre-processor
! Create Geometry
BLC4,0,0,80,100
CYL4,80,50,50
CYL4,0,20,20
CYL4,0,80,20
BLC4,-20,20,20,60
AADD,ALL ! Boolean Addition - add all of the areas together
CYL4,80,50,30 ! Create Bolt Holes
CYL4,0,20,10
CYL4,0,80,10
ASBA,6,ALL ! Boolean Subtraction - subtracts all areas (other than 6)
from base area 6
! Define Element Type
ET,1,PLANE82
KEYOPT,1,3,3 ! Plane stress element with thickness
! Define Real Constants
! (Note: the inside diameter must be positive)
R,1,20 ! r,real set number, plate thickness
! Define Material Properties
MP,EX,1,200000 ! mp,Young's modulus,material number,value
MP,PRXY,1,0.3 ! mp,Poisson's ratio,material number,value
! Define the number of elements each line is to be divided into
AESIZE,ALL,5 ! lesize,all areas,size of element
! Area Meshing
AMESH,ALL ! amesh, all areas
FINISH ! Finish pre-processing
/SOLU ! Enter the solution processor
ANTYPE,0 ! Analysis type,static
! Define Displacement Constraints on Lines (dl command)
DL, 7, ,ALL,0 ! There is probably a way to do these all at once...
DL, 8, ,ALL,0
DL, 9, ,ALL,0
DL,10, ,ALL,0
DL,11, ,ALL,0
DL,12, ,ALL,0
DL,13, ,ALL,0
DL,14, ,ALL,0
! Define Forces on Keypoints (fk command)
FK,9,FY,-1000 !fk,keypoint,direction,force
FINISH ! Finish the solution processor
SAVE ! Save your work to the database
/post1 ! Enter the general post processor
/WIND,ALL,OFF
/WIND,1,LTOP
/WIND,2,RTOP
/WIND,3,LBOT
/WIND,4,RBOT
GPLOT
/GCMD,1, PLDISP,2 ! Plot the deformed and undeformed edge
/GCMD,2, PLNSOL,U,SUM,0,1 ! Plot the deflection USUM
/GCMD,3, PLNSOL,S,EQV,0,1 ! Plot the equivalent stress
/GCMD,4, PLNSOL,EPTO,EQV,0,1 ! Plot the equivalent strain
/CONT,2,10,0,,0.0036 ! Set contour ranges
/CONT,3,10,0,,8
/CONT,4,10,0,,0.05e-3
/FOC,ALL,-0.340000,,,1 ! Focus point
/replot
PRNSOL,DOF, ! Prints the nodal solutions
This tutorial is the second of three basic tutorials created to illustrate commom features in ANSYS. The plane
stress bracket tutorial builds upon techniques covered in the first tutorial (3D Bicycle Space Frame), it is
therefore essential that you have completed that tutorial prior to beginning this one.
The problem to be modeled in this example is a simple bracket shown in the following figure. This bracket is to
be built from a 20 mm thick steel plate. A figure of the plate is shown below.
University of Alberta ANSYS Tutorials - www.mece.ualberta.ca/tutorials/ansys/CL/CBT/Bracket/Print.html
Copyright © 2001 University of Alberta
ASBA,6,ALL ! Boolean Subtraction - subtracts all areas (other than 6) from ba
...
Mechanical_Design