Solving Contact Problems with Abaqus - Intrinsys

325 Pages·2013·9.02 MB·English

8Ι
30 Solving Contact Problems with Abaqus
T
K
M
8
2
9
0
0
1
0
2
:.fe
3 r
10 DS UK Ltd, Coventry - March 2013
2
/3
0
/8
1
noΙ Stephen King
ita
m
ro
fn
la I Tony Richards
itn
e
d
ifn
o
C
sΙ
e
m
è
ts
y
S
tlu
a
s
s
a
D
©
mΙ
o
c
.s
d
3
.w
w
w
Ι
Seminar Abstract
Contact interactions between different parts play a key role when simulating
8Ι
3
0T bolted assemblies, manufacturing processes, dynamic impact events, and
K
M
8
29 various other systems. Accurately capturing these interactions is essential for
0
0
1
0
2 solving many engineering problems. SIMULIA has developed state-of-the-art
:.fe
3 r contact modeling capabilities in Abaqus.
1
0
2
/3
0
/81 Attend this seminar to learn the latest techniques and strategies for solving
nΙ
o
ita difficult contact problems with Abaqus. This seminar primarily focuses on
m
ro
lafn I Abaqus/Standard, with additional discussion of Abaqus/Explicit.
itn
e
d
ifno Topics include advantages of the general contact capability, accurate contact
C
sΙ
e pressures, insight on numerical methods, tips for improving convergence,
m
è
ts
y
S recent enhancements to the implicit dynamics procedure for contact models,
tlu
a
s
s and proper representation of physical details associated with contact.
a
D
©
mΙ
o
c
.s
d
3
.w
w
w
Ι
Lectures
• Lecture 1: Introduction
8Ι
3
0
T
K
M • Lecture 2: Defining Contact in an Analysis
8
2
9
0
0
1
0 • Lecture 3: Numerical Methods for Contact
2
:.fe
3 r
1 • Lecture 4: Contact Output and Diagnostics Tools (start)
0
2
/3
0
/8
1
nΙ
o
ita
m
ro (Lunch) 12:30pm – 1.30pm
fn
la I
itn
e
d
ifn
o
C
sΙ
e • Lecture 4 (cont.): Contact Output and Diagnostics Tools (finish)
m
è
ts
y
S
tlu • Lecture 5: Convergence Topics
a
s
s
a
D
m ©Ι • Lecture 6: Contact in Abaqus/Explicit
o
c
.s
d3 • Lecture 7: More Features
.w
w
w
Ι
Legal Notices
All Dassault Systèmes Software products described in this documentation are available only
8Ι
3 under license from Dassault Systèmes or its subsidiary/subsidiaries and may be used or
0
T
K
M reproduced only in accordance with the terms of such license.
8
2
9
0
0
1
0
2
:.fe
3 r The information in this document is subject to change without prior notice. Dassault Systèmes
1
02 and its subsidiaries shall not be responsible for the consequences of any errors or omissions
/3
0
/8 that may appear in this documentation.
1
nΙ
o
ita
m
ro
fn
la I No part of this documentation may be reproduced or distributed in any form without prior
itn
e written permission of Dassault Systèmes or its subsidiary/subsidiaries.
d
ifn
o
C
sΙ
e
m
è
ts © Dassault Systèmes, 2013.
y
S
tlu
a
s
s
a
D
© Printed in the U. S. A.
mΙ
o
c
.s
d
3
.w
w
w The 3DS logo, SIMULIA, CATIA, 3DVIA, DELMIA, ENOVIA, SolidWorks, Abaqus, Isight, and
Ι
Unified FEA are trademarks or registered trademarks of Dassault Systèmes or its subsidiaries
in the US and/or other countries. Other company, product, and service names may be
trademarks or service marks of their respective owners.
8Ι
30 Introduction
T
K
M
8
2
9
0
0
1
0
2
:.fe
3 r
10 Lecture 1
2
/3
0
/8
1
nΙ
o
ita
m
ro
fn
la I
itn
e
d
ifn
o
C
sΙ
e
m
è
ts
y
S
tlu
a
s
s
a
D
©
mΙ
o
c
.s
d
3
.w
w
w
Ι
Overview
• General Considerations
8Ι
3
0
T
K
M • Evolution of Contact in Abaqus
8
2
9
0
0
1
0 • Contact Examples
2
:.fe
3 r
1
0
2
/3
0
/8
1
nΙ
o
ita
m
ro
fn
la I
itn
e
d
ifn
o
C
sΙ
e
m
è
ts
y
S
tlu
a
s
s
a
D
©
mΙ
o
c
.s
d
3
.w
w
w
Ι
General Considerations
• What is contact?
8Ι
3
0
T
K
M • Physically, contact involves interactions between bodies
8
2
9
0
0
1
0 • Contact pressure resists penetration
2
:.fe
3 r Fairly
1 • Frictional stress resists sliding
0
2/3 intuitive
0
/8
1
nΙ • Electrical, thermal interactions
o
ita
m
ro
fn
la I
itn
e
d • Numerically, contact includes severe nonlinearities
ifn
o
C
sΙ
e • Inequality conditions result in discontinuous
m
è
ts
yS ―stiffness‖
tlua Numerically
s
s
a
D • Gap distance: d ≥ 0
m ©Ι challenging gap
o
c.s • Frictional stress: t ≤ mp
d
3
.w
w
w
Ι • Conductance properties suddenly change
when contact is established
General Considerations
• Various classifications of contact interactions can be considered
8Ι
3
0
T
K
M • Example: slender or bulky components
8
2
9
0
0
1
0 • Bulky components:
2
:.fe
3 r
1 • Typically many nodes in contact
0
2
/3
0
/8 at one time
1
nΙ
o
ita
m • Contact causes local deformation
ro
fn
la I and shear, but it causes little bending
itn
e
d
ifn
oC • Slender components
sΙ
e
m
è
ts • Often relatively few nodes in contact at
y
S
tlua one time
s
s
a
D
©
mΙ • Contact causes bending
o
c
.s
d
3
.w • Often more challenging
w
w
Ι
General Considerations
• Classifications of contact
8Ι
30 interactions:
T
K
M
8
29 • Slender or bulky components
0
0
1
0
2
:.fe • Deformable or rigid surfaces
3 r
1
02 • Degree of confinement and
/3
0
/8 compressibility of components
1
nΙ
o
itam • Two-body contact or self-
ro
lafn I contact
itn
e
d
ifn • Amount of relative motion
o
C
sΙ (small or finite sliding)
e
m
è
ts
y • Amount of deformation
S
tlu
a
s
sa • Underlying element type (1st or
D
©
mΙ 2nd order)
o
c
.s
d3 • Interaction properties (friction,
.w
w
w thermal, etc.)
Ι
• Which results are of interest
and importance (e.g. contact
stresses)
„Ingredients‟ of a Contact Model
• Contact surfaces
8Ι
3
0
T
K • Surfaces over bodies that may experience contact
M
8
2
9
0
0 • Contact interactions
1
0
2
:.fe
3 r • Which surfaces interact with one another?
1
0
2
/3
0 • Surface property assignments
/8
1
nΙ
oita • For example, contact thickness of a shell
m
ro
fn
la I • Contact property models
itn
e
d
ifn • Examples: pressure vs. overclosure relationship, friction coefficient, conduction
o
C
sΙ coefficients, etc.
e
m
è
ts
y
S • Contact formulation aspects
tlu
a
s
s
aD • For example, can a small-sliding formulation be used?
©
mΙ
oc • Algorithmic contact controls
.s
d
3
.w
w • Such as contact stabilization settings
w
Ι
Many of these aspect need not be
explicitly specified