Application Of Joints And Springs In Ansys

University of Alberta ANSYS Tutorials - www.mece.ualberta.ca/tutorials/ansys/CL/CAT/Joints/Print.html
Application of Joints and Springs in ANSYS
Introduction
This tutorial was created using ANSYS 5.7.1. This tutorial will introduce:
the use of multiple elements in ANSYS
elements COMBIN7 (Joints) and COMBIN14 (Springs)
obtaining/storing scalar information and store them as parameters.
A 1000N vertical load will be applied to a catapult as shown in the figure below. The catapult is built from steel
tubing with an outer diameter of 40 mm, a wall thickness of 10, and a modulus of elasticity of 200GPa. The
springs have a stiffness of 5 N/mm.

ANSYS Command Listing
/title, Catapult
/PREP7

ET,1,PIPE16

! Element type 1
ET,2,COMBIN7

! Element type 2
ET,3,COMBIN14

! Element type 3

R,1,40,10

! Real constants 1
Copyright © 2001 University of Alberta

University of Alberta ANSYS Tutorials - www.mece.ualberta.ca/tutorials/ansys/CL/CAT/Joints/Print.html
R,2,1e9,1e9,1e9
! Real constants 2
R,3,5, , ,

! Real constants 3

MP,EX,1,200000
! Young's modulus (Material 1)
MP,PRXY,1,0.33
! Poisson's ratio (Material 1)

N, 1, 0, 0, 0
! Node locations
N, 2, 0, 0,1000
N, 3,1000, 0,1000
N, 4,1000, 0, 0
N, 5, 0,1000,1000
N, 6, 0,1000, 0
N, 7, 700, 700, 500
N, 8, 400, 400, 500
N, 9, 0, 0, 0
N,10, 0, 0,1000
N,11, 0, 0, 500
N,12, 0, 0,1500
N,13, 0, 0,-500

TYPE,1

! Turn on Element 1
REAL,1

! Turn on Real constants 1
MAT,1

! Turn on Material 1

E, 1, 6

! Element connectivity
E, 2, 5
E, 1, 4
E, 2, 3
E, 3, 4
E,10, 8
E, 9, 8
E, 7, 8
E,12, 5
E,13, 6
E,12,13
E, 5, 3
E, 6, 4

TYPE,2

! Turn on Element 2
REAL,2

! Turn on Real constants 2

E, 1, 9, 11

! Element connectivity
E, 2, 10, 11

TYPE,3

! Turn on Element 3
REAL,3

! Turn on Real constants 3

E,5,8
!
Element
connectivity
E,8,6

/PNUM,KP,0

! Number nodes
/PNUM,ELEM,1

! Number elements
/REPLOT

FINISH
/SOLU

! Enter solution phase

ANTYPE,0 !
Static
analysis
NLGEOM,ON

! Non-linear geometry on
Copyright © 2001 University of Alberta

University of Alberta ANSYS Tutorials - www.mece.ualberta.ca/tutorials/ansys/CL/CAT/Joints/Print.html
NSUBST,5

! 5 Load steps of equal size

D,3,ALL,0,,,4,12,13
! Constrain nodes 3,4,12,13
F,7,FY,-1000

! Load node 7

SOLVE
FINISH

/POST1

PLDISP,2
*GET,VERT7,NODE,7,U,Y
Copyright © 2001 University of Alberta