keyopt and solid45

5/28/2018 Keyopt and Solid45

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Chapter 8

3D

Analysis of 3D Structural Solids


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Contents

8.1 SOLID45: 3DSOLID45: 3D Structural Solid Element

8.2 :Example: Static Analysis of an Allen wrench

8.3 3DOverview of 3D Solid Elements

8.4 : Allen SocketExercise: Torsional Stiffness of an Allen Socket


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8.1

SOLID45: 3D

SOLID45: 3D Structural Solid Element


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8.1.1 SOLID45


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8.1.2 SOLID45 Input Data (1/5)Element Name SOLID45

Nodes I, J, K, L, M, N, O, P

Degrees of Freedom UX, UY, UZ

Real Constants None

Material Properties EX, NUXY, GXY, ALPX, DENS, DAMP, etc.

Surface Loads Pressure

face 1 (JILK), face 2 (IJNM), face 3 (JKON),

face 4 (KLPO), face 5 (LIMP), face 6 (MNOP)Body Loads Temperature -- T(I), T(J), T(K), T(L), T(M), T(N), T(O), T(P)

Special Features Plasticity, Creep, Stress stiffening, Large deflection, Large strain, etc.

KEYOPT(1) Key to include extra shapes:

0 -- Include extra displacement shapes

1 -- Suppress extra displacement shapes

KEYOPT(2) Key for reduced integration:0 -- Full integration

1 -- Uniform reduced integration with hourglass control

KEYOPT(4) Key for element coordinate system:

0 -- Element C.S. is parallel to the global C.S.

1 -- Element C.S. is based on the element I-J side

KEYOPT(5)

Key for element solution

KEYOPT(6) Key for element solution


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8.1.2 SOLID45 Input Data (2/5)

Material Properties EX, EY, EZ

NUXY, NUYZ, NUXZ (or PRXY, PRYZ, PRXZ)

GXY, GYZ, GXZ

ALPX, ALPY, ALPZ (or CTEX, CTEY, CTEZ)

DENS

DAMP


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Loads Surface Loads

Pressure

face 1 (JILK), face 2 (IJNM), face 3 (JKON), face 4(KLPO), face 5 (LIMP), face 6 (MNOP)

Body Loads

Temperature

T(I), T(J), T(K), T(L), T(M), T(N), T(O), T(P) Etc.


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KEYOPT(1): Extra Displacement Shape

0 -- Include extra displacement shapes

1 -- Suppress extra displacement shapes


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KEYOPT(2): Reduced Integration

0 -- Full integration

1 -- Uniform reduced integration withhourglass control


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8.1.3 SOLID45 output Data

Name Definition

EL Element Number

NODES Nodes - I, J, K, L, M, N, O, P

MAT Material number

VOLU: Volume

XC, YC, ZC Location where results are reported

PRES Pressures P1 at nodes J, I, L, K; P2 at I, J, N, M; P3 at J, K, O,

N; P4 at K, L, P, O; P5 at L, I, M, P; P6 at M, N, O, P

TEMP Temperatures T(I), T(J), T(K), T(L), T(M), T(N), T(O), T(P)

S:X, Y, Z, XY, YZ, XZ Stresses

S:1, 2, 3 Principal stresses

S:INT Stress intensity

S:EQV Equivalent stress

Etc.


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8.1.4 Item/Sequence Number

ETABLE, SEQVJ, NMISC, 10ETABLE, S1P, NMISC, 36

Output

Quantity

Name

ETABLE and ESOL Command Input

Item I J K L M N O P

P1 SMISC 2 1 4 3 - - - -

P2 SMISC 5 6 - - 8 7 - -

P3 SMISC - 9 10 - - 12 11 -

P4 SMISC - - 13 14 - - 16 15

P5 SMISC 18 - - 17 19 - - 20

P6 SMISC - - - - 21 22 23 24S:1 NMISC 1 6 11 16 21 26 31 36

S:2 NMISC 2 7 12 17 22 27 32 37

S:3 NMISC 3 8 13 18 23 28 33 38

S:INT NMISC 4 9 14 19 24 29 34 39

S:EQV NMISC 5 10 15 20 25 30 35 40


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8.2

Example: Static Analysis of an Allen Wrench


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8.2.1 Problem Description


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8.2.2 ANSYS Procedure (1/8)

Set Up01

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0607

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FINISH

/CLEAR

/TITLE, Static Analysis of an Allen Wrench

/UNITS, SI ! Reminder only

*AFUN, DEG ! Units for angular functions

! Define parameters ...

EXX = 2.07E11 ! Yung's modulus

NU = 0.3 ! Poisson's ratio

W_HEX = 0.01 ! Width of hex flats

W_FLAT = W_HEX*TAN(30) ! Width of flatL_SHANK = 0.075 ! Length of shank

L_HANDLE = 0.20 ! Length of handle

BENDRAD = 0.01 ! Bend radius

L_ELEM = 0.0075 ! Length of elements

NO_D_HEX = 2 ! No. of div. on a flat

TOL = 25E-6 ! Selection Tolerance


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Attribute Tables

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21

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/PREP7

! Element types and material properties...

ET, 1, SOLID45 ! 8-node brick element

ET, 2, MESH200, 6 ! Mesh-Only Element

MP, EX, 1, EXX ! Young's modulus

MP, NUXY, 1, NU ! Possion's ratio


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8.2.2 ANSYS Procedure (3/8)Solid/Analysis Models

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4344

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! Wrench bottom end...

RPOLY, 6, W_FLAT ! Hexagonal area

L, 4, 1 ! Middle of hex shape

ASBL, 1, 7,, DELETE, KEEP ! Cut into two areas

CM, BOTAREA, AREA ! Group two areas

/PNUM, KP, ON

/PNUM, LINE, ON/PNUM, AREA, ON

/TITLE, Fixed End (Viewed from Below)

APLOT

LESIZE, 1,,, NO_D_HEX



TYPE, 2 ! Mesh-Only Elements

MSHAPE, 0, 2D ! Quadrilaterial shapes

MSHKEY, 1 ! Mapped meshing

AMESH, ALL ! Mesh all two areas

/TITLE, Meshed Fixed End

EPLOT


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8.2.2 ANSYS Procedure (4/8)Solid/Analysis Models

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! Middle line of the wrench...

/VIEW,, 1, 1, -1 ! Isometric view

/VUP,, -Z ! -Z axis as view-up

K, 7, 0, 0, 0

K, 8, 0, 0, -L_SHANK

K, 9, 0, L_HANDLE, -L_SHANK

L, 7, 8

L, 8, 9

LFILLT, 8, 9, BENDRAD

/TITLE, Middle Line of the Wrench

LPLOT

/PNUM, DEFAULT

! Drag the 2D mesh to produce 3D elements...

TYPE, 1 ! SOLID45 is used

ESIZE, L_ELEM ! Default to L_ELEM

VDRAG, 2, 3,,,,, 8, 10, 9 ! Drag to create 3D mesh

/TITLE, 3D Mesh of the Wrench

EPLOTFINISH


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8.2.2 ANSYS Procedure (5/8)Solve: Load Step 1

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/SOLU

! Load step 1...

CMSEL, S, BOTAREA ! Fixed end areas

LSEL, S, EXT ! Exterior lines

NSLL, S, 1 ! Nodes on those lines

D, ALL, ALL, 0 ! Fix those nodes

ALLSEL

ASEL, S, LOC, Y, BENDRAD, L_HANDLE

ASEL, R, LOC, X, W_FLAT/2, 99

NSLA, S, 1

NSEL, R,LOC,Y,L_HANDLE-3*L_ELEM-TOL,L_HANDLE+TOL

*GET, MINYVAL, NODE,, MNLOC, Y ! Min Y of nodes

*GET, MAXYVAL, NODE,, MXLOC, Y ! Max Y of nodes

PTORQ = 100/(W_HEX*(MAXYVAL-MINYVAL))

SF, ALL, PRES, PTORQ

ALLSEL

/PBC, U,, ON

/PSF, PRES,, 2

/TITLE, Load Step 1

EPLOT

SOLVE


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Solve: Load Step 2107

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! Load step 2...

PDOWN = 20/(W_FLAT*(MAXYVAL-MINYVAL))

ASEL, S, LOC, Z, -(L_SHANK+W_HEX/2)

NSLA, S, 1NSEL, R,LOC,Y,L_HANDLE-3*L_ELEM-TOL,L_HANDLE+TOL

SF, ALL, PRES, PDOWN

ALLSEL

/TITLE, Load Step 2

EPLOT

SOLVE

FINISH


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8.2.2 ANSYS Procedure (7/8)Results: Load Step 1

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/POST1

! Results for load step 1

/PBC, DEFAULT

/PSF, DEFAULT

/TRIAD, OFF

SET, 1

/TITLE, Deformed Shape for Load Step 1

PLDISP, 2

/Title, Stress Intensity for Load Step 1

/ANGLE,, 120, YM ! Rotate about model axis

PLNSOL, S, INT


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8.2.2 ANSYS Procedure (8/8)Results: Load Step 2

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! Results for load step 2

SET, 2

/TITLE, Deformed Shape for Load Step 2

/ANGLE, 1, 0, YM

PLDISP, 2

/Title, Stress Intensity for Load Step 2

/ANGLE, 1, 120, YM

PLNSOL, S, INT


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8.3

3D

Overview of 3D Solid Elements


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8.3.1 General 3D Structural

Solids


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8.3.2 Large Strains


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8.3.3 3D Solids with

Rotations


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8.3.4 P-Elements


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8.3.5 Explicit Dynamics


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8.3.6 Hyperelasticity


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8.3.7 Viscoelasticity and

Viscoplasticity


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8.3.8 Anisotropic and

Composite Materials


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8.3.9 Thermal Solids


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8.3.10 Fluid Elements


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8.3.11 Electrostatic Fields


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8.3.12 Magnetic Fields


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8.3.13 Coupled-Field

Elements


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8.4 Exercise: Torsional

Stiffness of an Allen Socket

keyopt and solid45

Documents

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