introduction chapter one. training manual september 30, 2001 inventory #001491 1-2 introduction...
DESCRIPTION
Training Manual September 30, 2001 Inventory # Introduction Welcome! This is the last in a series of three training courses on ANSYS nonlinearities: –Basic Structural Nonlinearities (2 days) –Advanced Contact and Bolt Pretension (1 day) –Advanced Structural Nonlinearities (2 days)TRANSCRIPT
Introduction
Chapter One
September 30, 2001
Inventory #001491
1-2
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
IntroductionWelcome!
• Welcome to the Advanced Structural Nonlinearities Training Course!
• This training course covers the wide range of constitutive models available in ANSYS, including advanced plasticity, viscoplasticity/creep, and hyperelasticity. Appropriate element selection, geometric instability, and element birth-and-death will be discussed as well.
• It is intended for ANSYS users who are already familiar with basic procedures for performing nonlinear static analyses using ANSYS (topics covered in the Basic Structural Nonlinearities class).
September 30, 2001
Inventory #001491
1-3
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
IntroductionWelcome!
• This is the last in a series of three training courses on ANSYS nonlinearities:– Basic Structural Nonlinearities (2 days)– Advanced Contact and Bolt Pretension (1 day)– Advanced Structural Nonlinearities (2 days)
September 30, 2001
Inventory #001491
1-4
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Course ObjectivesThe topics covered in this Advanced Nonlinearities seminar can be classified into the following areas:
ElementTechnology
MetalInelasticity
RubberElasticity
GeotechnicalMaterials
GeometricInstability
ElementBirth & Death
Rate-independentBehavior1
Rate-dependentBehavior2
Rate-independentBehavior3
Rate-dependentBehavior4
LinearBuckling
NonlinearBuckling
Concrete GranularMaterials
1 Plasticity models covered in this class do not include BISO, MISO, BKIN, KINH/MKIN since these have been addressed in the Basic Structural Nonlinearities Course2 Includes creep (implicit and explicit CREEP) and viscoplasticity (RATE & ANAND) models.3 i.e., Hyperelasticity4 Although it is under the categorization of ‘Rubber elasticity,’ glass viscoelasticity model is also addressed in this section
September 30, 2001
Inventory #001491
1-5
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Course Objectives
Much of this seminar will focus on the 18x family of elements, due to their complete wealth of nonlinear features:
– BEAM188/189 can have multi-material cross-section. SHELL181 supports composite definition.– HILL (anisotropic Hill potential) can be used with any plasticity model (including CREEP, RATE).– CHAB (Chaboche nonlinear kinematic hardening) can be combined with any isotropic hardening.– Although some cells above are blank, this is usually because item is not applicable to element.– All 18x elements support USERMAT user-defined material as well as USERCREEP user-defined implicit
creep law. Elements 181-187 support USERHYPER user-defined hyperelasticity model. User-programmable features will not be covered in this seminar.Please refer to ANSYS Guide to User-Programmable Features for details.
Isot
ropi
c,
Ort
hotr
opic
(M
P)
AN
EL
BIS
O
MIS
O
NLI
SO
BK
IN
KIN
H/M
KIN
CH
AB
HIL
L
RA
TE
(P
EIR
CE
, P
ER
ZY
NA
)
CR
EE
P (
Impl
icit)
Moo
ney-
Riv
lin
Pol
ynom
ial F
orm
Ogd
en
Arr
uda-
Boy
ce
Ele
men
t B
irth
and
Dea
th
Initi
al S
tres
s
LS-D
YN
A
Com
patib
ility
B-B
ar
UR
I/S
tand
ard
Enh
ance
d S
trai
n
Mix
ed U
-P
LINK180 Truss Linear • • • • • • • • • • • • •BEAM188 Beam Linear • • • • • • • • • • • • •BEAM189 Beam Quadratic • • • • • • • • • • • • •SHELL181 Shell Bilinear • • • • • • • • • • • • • • • • • • • • •PLANE182 Planar Bilinear • • • • • • • • • • • • • • • • • • • • • • •PLANE183 Planar Seren. • • • • • • • • • • • • • • • • • • • •SOLID185 Solid Trilinear • • • • • • • • • • • • • • • • • • • • • • •SOLID186 Solid Seren. • • • • • • • • • • • • • • • • • • • •SOLID187 Solid Seren. Tet • • • • • • • • • • • • • • • • • • • •
Formulation
AN
SY
S E
lem
ent
Libr
ary
Typ
e of
Ele
men
t
Inte
rpol
atio
nOther Features
Use
r-D
efin
ed
Elasticity Plasticity Viscoplasticity Hyperelasticity
September 30, 2001
Inventory #001491
1-6
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Course Objectives• This class will cover ANSYS usage in these nonlinear topics.
– When applicable, general information on material behavior, testing, and curve-fitting procedures will be discussed.
• Please keep in mind that this is not a material science course. It is assumed that the reader will be adequately familiar with the material behavior to make good engineering judgements.– This class will focus on issues pertinent to procedural aspects
of usage of the material laws in ANSYS.– When possible, references for further reading will be presented.– Material testing should be done by those familiar with these
types of procedures.
September 30, 2001
Inventory #001491
1-7
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Course Material• The Training Manual you have is an exact copy of the slides.
• Workshop descriptions and instructions are included in the Workshop Supplement.
• Copies of the workshop files are available (upon request) through your instructor.
September 30, 2001
Inventory #001491
1-8
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Topics Covered2. Element Technology
3. Advanced Rate-Independent Plasticity
4. Creep
5. Rate-Dependent Plasticity
6. Hyperelasticity
7. Viscoelasticity
8. Drucker-Prager/Concrete
9. Geometric Instability: Buckling
10. Element Birth and Death
Material Input
Chapter One, Appendix A
September 30, 2001
Inventory #001491
1-10
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Material Input• Before beginning discussion on the Advanced Nonlinearities
topics, the material input procedure will be covered.
• Nonlinear constitutive models can be input via commands or in the Materials GUI.– Commands take the following form:
• MP command defines linear material properties, if needed.• TB command selects the nonlinear constitutive model• TBTEMP defines temperature for temperature-dependency• TBDATA defines the material parameters
– (For MISO, KINH materials, TBPT is used instead)• TBTEMP and TBDATA can be repeated for each temperature
– GUI method of input uses the Materials GUI (explained next)
September 30, 2001
Inventory #001491
1-11
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Materials GUI• All structural material properties, linear and/or nonlinear, are
conveniently defined through the Materials GUI – Main Menu > Preprocessor > Material Props > Material Models...
Currently Defined Materials
Available Constitutive Models
September 30, 2001
Inventory #001491
1-12
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Materials GUI• Structural Constitutive Models are organized into categories
for easier selection:
September 30, 2001
Inventory #001491
1-13
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
• If required, linear properties can be defined first through the Materials GUI:– Structural > Linear > Elastic > Isotropic
Introduction Materials GUI
September 30, 2001
Inventory #001491
1-14
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Materials GUI• Note that if you may select a nonlinear constitutive model prior to
defining the linear material data (EX, PRXY, etc.). If this nonlinear material requires linear material data, the Materials GUI will provide a warning:
Then, the appropriate dialog box will appear. You will need to enter these linear material properties prior to providing input of nonlinear properties.
Through this manner, the Materials GUI ensures proper and consistent material definition.
September 30, 2001
Inventory #001491
1-15
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Materials GUI• Other properties such as thermal expansion coefficient and density
can also be defined, as needed.
September 30, 2001
Inventory #001491
1-16
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Materials GUI• Most materials can be temperature-dependent. The Materials
GUI provides a dynamic spreadsheet where temperature-dependent constants can easily be added or deleted. – Data points are dynamically input (if applicable)– Some materials allow plotting of temperature-dependent data.
September 30, 2001
Inventory #001491
1-17
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Materials GUI• In the Materials GUI, new materials can be defined easily by
specifying a different Material ID.
September 30, 2001
Inventory #001491
1-18
Advanced Structural Nonlinearities 6.0
Advanced Structural Nonlinearities 6.0
Training Manual
Introduction Materials GUI• Materials may also be conveniently copied or deleted in the
Materials GUI.