ABAQUS显隠转换分析

用户可以输入从没有被定义成装配件的实例的

element

set

，或者可以输入

part

实例从已

经定义成装配件实例的

part

实例。在

CAE

里面仅仅能从装配件的构件实例中输 入模型。

指定从

element set

中输入数据和结果。

输入的 例子参见

“

Springback of two- dimensional draw bending,

”

Section 1.5.1 of

the Abaqus Example Problems Manual

, and

“

Axisymmetric forming of a circular

cup,

”

Section 1.3.7 of the Abaqus Example Problems Manual

。

Input

Use the following option to import element sets from a previous analysis:

File

Usage:

*IMPORT

list of element sets that are to be imported

为了阻止模棱两可的单元和节点，

*import

必须在定义额外模型数据前指定，另外

< br>*import

只能指定一次

每个

element

set

的名字在

*import

输入行必须在原始文件 的截面定义中使用过，

（

e.g.*solid section

），

element set

仅能包含不超过三种类型的单元。

在

CAE

里面只能从

PART INSTANCES

里面输入结果和数据

如果输入的超过一个

part

instance,part

instance

必须从一个结果文件里输入且输入的参

数必须和输入文件

part instances

里面的一致，每个

inst ance

的名字应该保持一致，只有

import insta nce

里面的

sets

才能被输入，< /p>

sets

在

assemblies

定义的必须在

import

分析

中重新定义，重新定义的

sets

不能修改输入的新 截面，材料的方向，法线，和梁方向

Input

Usage:

File

Use the following options to import a part instance from a previous

analysis:

*INSTANCE

, INSTANCE=

instance-name

Additional set and surface definitions (optional)

*IMPORT

*END INSTANCE

Abaqus/CAE

In

Abaqus/CAE you

can

import

model

data

and

results

only from

Usage:

models that are defined as assemblies of part instances.

Load

module:

Create

Predefined

Field

:

Step:

Initial

:

choose

Other

for the

Category

and

Initial State

for the

Types for Selected

Step

:

select

the

instances

to

which

the

initial

state

should

be

assigned

Specifying the transfer of

model data and results

The import capability is used to transfer model data and results from one analysis

to another. The following sections describe how to specify the import request. You

can import element sets from models that are not defined as assemblies of part

instances,

or

you

can

import

part

instances

from

models

that

are

defined

as

assemblies of part instances. In Abaqus/CAE you can import model data and results

only from models that are defined as assemblies of part instances.

Specifying

the

transfer

of

model

data

and

results

for

models

that

are

not

defined as assemblies of part instances

You

can

import

element

sets

from

a

previous

analysis

to

specify

the

transfer

of

model

data

and

results

for

models

that

are

not

defined

as

assemblies

of

part

instances. This import capability is illustrated in

“

Springback of two- dimensional

draw

bending,

”

Section

1.5.1

of

the

Abaqus

Example

Problems

Manual

,

and

“

Axisymmetric forming of a circular cup,

”

Section 1.3.7 of the Abaqus Example

Problems Manual

.

Input

Use the following option to import element sets from a previous analysis:

File

Usage:

*IMPORT

list of element sets that are to be imported

To

prevent

any

ambiguity

regarding

element

and

node

definitions,

the

*IMPORT

option must be specified

before any options that define additional

model

data

in

the

input

file.

In

addition,

the

*IMPORT

option

can

be

specified only once.

Each element set name

specified on the data line of the

*IMPORT

option

must have been used in a section definition option

(e.g.,

*SOLID SECTION

)

in

the

original

analysis

.

An

element

set

can

contain

no

more

than

three

different types of elements.

Abaqus/CAE

Usage:

In Abaqus/CAE you can import model data and results only from

models that are defined as assemblies of part instances.

Specifying the transfer of model data and results for models that are defined as

assemblies of part instances

You can

import part instances

from a previous analysis to specify the transfer of

model data and results

for models that are defined as assemblies of part instances.

If you

import

more than

one

part

instance, the

part

instances

must

be

from the

same output database

(.odb) file and all import parameters must be the same for

each

imported

part

instance.

Each

instance

name

that

you

specify

must

be

the

same as the instance name in the original analysis. Only sets that are defined within

the imported instance will be imported

.

Sets defined at the assembly level must be

redefined in the import set definitions and surface definitions can be

added upon import.

You

cannot

assign new sections, material orientations, normals,

or beam orientations to the imported part instance.

Input

Usage:

File

Use the following options to import a part instance from a previous

analysis:

*INSTANCE

, INSTANCE=

instance-name

Additional set and surface definitions (optional)

*IMPORT

*END INSTANCE

Abaqus/CAE

In

Abaqus/CAE you

can

import

model

data

and

results

only from

Usage:

models that are defined as assemblies of part instances.

Load module:

Create Predefined Field

:

Step: Initial

: choose

Other

for the

Category

and

Initial State

for the

Types for Selected Step

:

select the instances to which the initial state should be assigned

Identifying the analysis from which the data will be obtained

You must specify the name of the job from which the model and results data will be

obtained.

Input

File

For all models you can enter the following input on the command line:

Usage:

abaqus job=

job- name

oldjob=

oldjob- name

If the

oldjob

parameter is omitted, Abaqus will prompt for the job name

(see

“

Abaqus/Standard, Abaqus/Explicit, and Abaqus/CFD execution,

”

Section 3.2.2

).

Alternatively, for models defined as assemblies of part instances, you can

use the following option:

*INSTANCE

, LIBRARY=

oldjob-name

If you import more than one part instance, the

oldjob-name

specified by

the

LIBRARY

parameter

must

be

the

same

for

each

imported

part

instance.

If

the

job

name

is

specified

on

the

command

line

using

the

oldjob

option,

the

command

line

specification

will

take

precedence

over

the

LIBRARY parameter.

Abaqus/CAE

In

Abaqus/CAE

you

can

import

model

data

and

results

only

from

Usage:

models that are defined as assemblies of part instances.

Load module:

Create Predefined Field

:

Step: Initial

: choose

Other

for the

Category

and

Initial State

for the

Types for Selected Step

:

Job name:

output- database-name

从包含的数据文件中指定分析数据

必须具体制定包含数据和结果文件的名字

InputFile

Usage:

For all models you can enter the following input on the command

line:

Importing model data

Element

property

definitions

of

imported

elements

can

be

redefined

only

if

the

reference configuration is updated (see

“Updating the imported configuration

”)

and the material state is not imported (see

“Importing the material state

”). In this

case the material orientation definitions (

“

Orientations,

”

Section 2.2.5

), hourglass

stiffness

but

not

hourglass

control

definitions,

and

transverse

shear

stiffness

definitions

(in

the

case

of

shell

elements)

of

the

imported

elements

can

also

be

redefined.

For other reference configuration and material state combinations, the information

required to define the section for each imported element will be imported from the

original analysis. Material orientations cannot be redefined in the import analysis;

orientation names cannot be reused in the import analysis. For imported elements,

the material orientations will be transferred from the original analysis. Transverse

shear stiffness for imported shell elements cannot be redefined; the values will be

transferred

from

the

original

analysis.

Hourglass

stiffness

for

the

imported

elements cannot be redefined in an Abaqus/Standard import analysis; the default

values will be used. The section control definitions (kinematic formulation, order of

accuracy in the element formulation, and hourglass control approach) to be used

for

imported

elements

cannot

be

redefined

(see

“

Transferring

results

between

Abaqus/Explicit and Abaqus/Standard,

”

Section 9.2.2

, for details).

Only nodes associated with the imported elements are imported. New nodes can

be defined in the import analysis.

Nodes

or

elements

that

use

the

same

numbers

as

nodes

or

elements

being

imported can be defined provided that the reference configuration is updated, the

material state is not imported, and the import is not done from an instance library.

The

new

definitions

will

overwrite

the

imported

definitions.

If

the

reference

configuration

is

not

updated,

new

nodes

or

elements

cannot

use

the

imported

node

and

element

numbers

irrespective

of

whether

or

not

the

material

state

is

imported.

During

results

transfer

from

an

Abaqus/Standard

analysis

to

another

Abaqus/Standard analysis

or from

an

Abaqus/Explicit

to

another

Abaqus/Explicit

analysis, the coordinates of imported nodes can be modified from their imported

values

by

respecifying

the

nodal

definitions

if

the

reference

configuration

is

updated

and

the

material

state

is

not

imported.

This

modification

of

the

coordinates

of

imported

nodes

is

not

allowed

during

transfer

of

results

from

Abaqus/Explicit to Abaqus/Standard or vice versa.

Importing model data defined by a distribution

While

transferring

results

from

one

Abaqus/Standard

analysis

to

another

Abaqus/Standard

analysis,

most

element

or

material

properties

defined

by

a

distribution (see

“

Distribution definition,

”

Section 2.7.1

) are imported along with

the elements. The only exceptions are spatially varying thicknesses and orientation

angles

defined on

the

layers

of

composite shells

and

solids;

in

this

case

Abaqus

issues an error message during input file preprocessing.

While transferring results from an Abaqus/Explicit analysis to an Abaqus/Standard

analysis, the only spatially varying element properties defined by a distribution that

can be imported are shell thicknesses and section orientations for shell and solid

elements. If any other element or material properties are defined with a distribution,

Abaqus issues an error message during input file preprocessing.

While transferring results from an Abaqus/Standard analysis to an Abaqus/Explicit

analysis or from an Abaqus/Explicit analysis to another Abaqus/Explicit analysis, the

only

spatially

varying

element

properties

defined

by

a

distribution

that

can

be

imported

are

shell

thicknesses,

section

orientations

for

shell

and

solid

elements,

orientation angles defined on the layers of composite shells, and section stiffness

matrices

specified

directly

for

general

shell

sections.

If

any

other

element

or

material properties are defined with a distribution, Abaqus issues an error message

during input file preprocessing.

Importing results from an Abaqus/Standard analysis (other than a direct cyclic

analysis)

If the results are imported from an Abaqus/Standard analysis, you can specify the

step and increment in the restart file for which the results are to be imported. By

default, the results written at the end of the analysis are imported.

Input

File

*IMPORT

, STEP=

step

, INCREMENT=

increment

Usage:

For

models

that

are

defined

as

assemblies

of

part

instances,

the

*IMPORT

option must appear within a part instance definition.

Abaqus/CAE

In

Abaqus/CAE you

can

import

model

data and

results

only from

Usage:

models that are defined as assemblies of part instances.

Load module:

Create Predefined Field

:

Step: Initial

: choose

Other

for the

Category

and

Initial State

for the

Types for Selected Step

:

select

instances:

Step

:

select

Specify

:

step

and

Frame

:

select

Specify

:

increment

Importing results from an Abaqus/Standard direct cyclic analysis

If the results are imported from a direct cyclic analysis, you can specify the step and

iteration

number

in

the

restart

file

for

which

the

results

are

to

be

imported.

By

default, the results written at the end of the analysis are imported.

Input

File

*IMPORT

, STEP=

step

, ITERATION=

iteration

Usage:

For

models

that

are

defined

as

assemblies

of

part

instances,

the

*IMPORT

option must appear within a part instance definition.

Abaqus/CAE

In

Abaqus/CAE you

can

import

model

data and

results

only from

Usage:

models that are defined as assemblies of part instances.

Load module:

Create Predefined Field

:

Step: Initial

: choose

Other

for the

Category

and

Initial State

for the

Types for Selected Step

:

select

instances:

Step

:

select

Specify

:

step

and

Frame

:

select

Specify

:

iteration

Importing results from an Abaqus/Explicit analysis

If

the

results

are

imported

from

an

Abaqus/Explicit

analysis,

you

can

specify

the

step and interval in the state file for which the results are to be imported. By default,

the results written at the end of the analysis are imported.

Input

File

*IMPORT

, STEP=

step

, INTERVAL=

interval

Usage:

For

models

that

are

defined

as

assemblies

of

part

instances,

the

*IMPORT

option must appear within a part instance definition.

Abaqus/CAE

In

Abaqus/CAE you

can

import

model

data

and

results

only from

Usage:

models that are defined as assemblies of part instances.

Load module:

Create Predefined Field

:

Step: Initial

: choose

Other

for the

Category

and

Initial State

for the

Types for Selected Step

:

select

instances:

Step

:

select

Specify

:

step

and

Frame

:

select

Specify

:

interval

Updating the imported configuration

Once

the

current

model

configuration

of

an

Abaqus

analysis

is

imported

into

Abaqus/Explicit or Abaqus/Standard, the analysis can be continued with or without

updating

the

reference

configuration

to

be

the

imported

configuration.

If

the

reference

configuration

is

not

updated

to

be

the

imported

configuration,

the

displacements

and

strains

are

reported

as

total

values

relative

to

the

original

reference

configuration

and

will,

hence,

be

continuous.

If

the

reference

configuration

is

updated

to

be

the

imported

configuration,

displacements

and

strains reported in the import analysis are the total values relative to the updated

reference configuration. This choice is useful if results need to be displayed relative

to the imported configuration, such as may be desirable in springback analysis. The

reference configuration cannot be updated if the imported analysis is geometrically

linear.

If

connector

elements

are

imported,

the

configuration

can

be

updated

provided

that the state is not imported.

Input

File

Use the following option to specify that the reference configuration is

to be updated to the imported configuration:

*IMPORT

, STEP=

step

, UPDATE=YES

Usage:

Use

the

following

option

to

specify

that

the

reference

configuration

should not be updated to the imported configuration:

*IMPORT

, STEP=

step

, UPDATE=NO

For

models

that

are

defined

as

assemblies

of

part

instances,

the

*IMPORT

option must appear within a part instance definition.

Abaqus/CAE

In Abaqus/CAE you can import model data and results only from

Usage:

models that are defined as assemblies of part instances.

Load module:

Create Predefined Field

:

Step: Initial

: choose

Other

for the

Category

and

Initial State

for the

Types for Selected Step

:

toggle

Update reference configuration

on or off

Importing the material state

You can specify whether or not the associated material state should be imported. If

you choose to import the material state, the following are imported:

?

?

?

?

?

?

stresses;

equivalent plastic strains;

back stresses for the kinematic hardening models;

user- defined state variables;

damage-related state variables for the concrete damaged plasticity model;

damage-related

state-variables

for

traction-separation

response

with

cohesive elements;

?

damage-related state variables for ductile metals;

?

?

damage-related state variables for fiber-reinforced composites;

maximum

deviatoric

strain

energy

density

during

deformation

history

for

Mullins effect;

?

?

internal strains and stresses for viscoelastic material models; and

connector state variables such as plastic strains, frictional slip, and damage

state.

Thus, the state is imported correctly for further analysis only for the following:

?

?

?

?

?

?

?

?

?

?

?

?

?

?

linear elasticity,

Mises plasticity (including the kinematic hardening models),

extended Drucker-Prager plasticity,

crushable foam plasticity,

Mohr-Coulomb plasticity,

critical state (clay) plasticity,

cast iron plasticity,

concrete damaged plasticity,

hyperelasticity (including Mullins effect),

hyperfoam,

viscoelasticity,

traction-separation response with damage for cohesive elements,

damage for ductile metals,

damage for fiber- reinforced composites,

?

?

connector behavior, and

materials defined in user subroutines

UMAT

and

VUMAT

.

For

all

other

material

models

only

stresses

will

be

imported.

No

other

state

variables will be imported.

If the material behavior is defined in a user subroutine, you must ensure that the

UMAT

and

VUMAT

are consistent.

If connector elements are imported, the state can be imported provided that the

configuration is not updated.

Input

Usage:

File

Use the following option to specify that the material state should be

imported:

*IMPORT

, STATE=YES

Use the following option to specify that the material state should not

be imported:

*IMPORT

, STATE=NO

For

models

that

are

defined

as

assemblies

of

part

instances,

the

*IMPORT

option must appear within a part instance definition.

Abaqus/CAE

In

Abaqus/CAE

you

can

import

model

data

and

results

only

from

Usage:

models that are defined as assemblies of part instances. Abaqus/CAE

always

imports

the

material

state.

If

you

want

to

import

only

the

deformed

mesh,

you

can

import

an

orphan

mesh

from

a

selected

step and increment of an output database; see

“

What kinds of files

can be imported and exported from Abaqus/CAE?,

”

Section 10.1.1

of the Abaqus/CAE User's Manual

.

Redefining constraints upon import

Most constraints (such as multi-point constraints and surface-based tie constraints)

are not imported from the original analysis and must be redefined in the import

analysis.

For

constraints

such

as

surface-based

ties

it

is

appropriate

to

redefine

these

constraints

in

the

original

reference

configuration.

This

ensures

identical

constraint

data

are

regenerated

in

the

import

analysis.

In

an

Abaqus/Standard

analysis

with

adaptive

meshing

and

acoustic-to-structure

tie

constraints,

the

structural as well as the acoustic nodes may move from their initial positions. When

such

acoustic

and

structure

meshes

are

imported

from

Abaqus/Standard

into

Abaqus/Explicit

and

the

tie

constraint

is

redefined,

the

acoustic

elements

at

the

interface may appear distorted when viewed in the undeformed plot mode in the

Visualization

module

of

Abaqus/CAE

(the

deformed

plot

at

time=0

displays

the

correct mesh). To regenerate constraints in the original configuration, specify that

the reference configuration should not be updated to the imported configuration.

If a new constraint is defined in the import analysis, it is appropriate to generate the

constraint data based on the current configuration. See

“Updating the imported

configuration

” above for more information.

Importing element set and node set definitions

All element set and node set definitions associated with the imported elements are

imported

by

default.

For

models

that

are

not

defined

as

assemblies

of

part

instances, you can also selectively import only specified element set or node set

definitions.

This

capability

provides

a

convenient

way

of

selectively

reusing

the

element

or

node sets

defined

in

the original

analysis. However,

any members of

such

sets

that

do

not

belong

to

the

imported

elements

are

removed

from

the

specified sets.

For example, suppose three element sets

—

SHELL3D, MEMB, and ALL

—

are defined

in the original analysis. Element set ALL contains all of the elements in element sets

SHELL3D

and

MEMB,

as

well

as

other

elements.

You

choose

to

import

only

the

element

sets

SHELL3D and

MEMB

(i.e.,

the

elements

in

these

sets

as

well

as

the

element

set

definitions).

In

addition,

you

selectively

import

the

element

set

definition ALL (but not the elements in this set). If element 100 belongs to element

set ALL but not to either element set SHELL3D or element set MEMB, it will not be

imported and will be removed from the list of elements belonging to element set

ALL.

The

imported

element

set

definitions

are

processed

before

any

node

or

element definitions; therefore, even if element 100 is subsequently redefined in the

import analysis, it will not belong to element set ALL (unless it is explicitly assigned

to element set ALL in the import analysis).

Only node and element sets defined in the original or previous import analysis are

available for importing. New sets defined during a restart run cannot be imported.

Input

File

Use either or both of the following options immediately following the

Usage:

*IMPORT

option to import selected element or node set definitions:

*IMPORT ELSET

*IMPORT NSET

For models that are defined as assemblies of part instances, you cannot

selectively

import

element

and

node

set

definitions.

All

element

and

node set definitions are imported automatically.

Abaqus/CAE

In

Abaqus/CAE

you

can

import

model

data

and

results

only

from

Usage:

models that are defined as assemblies of part instances. You cannot

selectively import element and node set definitions in Abaqus/CAE.

All element and node set definitions are imported automatically.

Specifying a tolerance for shell normals in the updated configuration

When the imported configuration is updated upon import, the mesh discretization

may

not

satisfy

the

mesh

geometry

checks

imposed

in

Abaqus/Explicit

or

Abaqus/Standard to evaluate whether or not a mesh is reasonable. In the case of

highly

warped

shell

elements

it

is

possible

that

the

normal

at

the

center

of

the

element that is calculated from the midsurface interpolation may differ from the

normal that is interpolated from the rotated normals at the nodes. If the difference

exceeds the tolerance specified, the analysis will terminate. This suggests that a fine

mesh

may

be

required

to

model

areas

of

high

curvature

change

to

achieve

a

successful analysis.

The

unit

normal

computed

from

the

midsurface

interpolation,

predicted by the interpolation of the rotated normals at the nodes,

the condition:

where you can specify the tolerance,

default value of

= 0.1 is used.

,

and

that

, must satisfy

. If you do not specify a tolerance value, a

Input

File

If

you

update

the

reference

configuration

to

be

the

imported

Usage:

configuration, you can specify a tolerance for error checking on shell

normals:

*IMPORT CONTROLS

, NORMAL TOL=

Abaqus/CAE Usage:

The shell normal tolerance is not supported in Abaqus/CAE.

Abaqus Analysis User's Manual

9.2.2 Transferring results between Abaqus/Explicit and Abaqus/Standard

Products:

Abaqus/Standard Abaqus/Explicit Abaqus/CAE

References

?

?

?

?

?

?

?

“

Transferring results between Abaqus analyses: overview,

”

Section 9.2.1

*IMPORT

*IMPORT ELSET

*IMPORT NSET

*IMPORT CONTROLS

*INSTANCE

“

Transferring

results

between

Abaqus

analyses,

”

Section

16.6

of

the

Abaqus/CAE User's Manual

Overview

Abaqus

provides

the

capability

to

import

a

deformed

mesh

and

its

associated

material

state

from

Abaqus/Standard

into

Abaqus/Explicit

and

vice

versa.

In

addition, new model information can be specified during the import analysis. This

capability is useful for problems that involve several analysis stages. For example, in

manufacturing processes the preloading can be analyzed using Abaqus/Standard

and

the

subsequent

forming

operation

can

be

simulated

using

Abaqus/Explicit.

Finally, the springback of the material can be performed in Abaqus/Standard.

For

this

capability

to

work,

the

same

release

of

Abaqus/Explicit

and

Abaqus/Standard must be run on computers that are binary compatible.

Information about how to transfer results between Abaqus analyses is provided in

“

Transferring results between Abaqus analyses: overview,

”

Section 9.2.1

.

Specifying new data in an import analysis

Additional

model

definitions

such

as

new

elements,

nodes,

surfaces,

etc.

can

be

defined during the import analysis. Initial conditions can also be specified during

the import analysis.

New model definitions

New

nodes, elements, and

material

properties

can

be

added to the model

in an

import analysis once import has been specified. Nodal coordinates must be defined

in

the

updated

configuration,

regardless

of

whether

or

not

the

reference

configuration is updated on import (see

“Updating the imported configuration”

in “Transferring results between Abaqus analyses: overv

iew,

”

Section 9.2.1

). The

usual Abaqus input can be used. Imported material definitions can be used with the

new elements (which will need new section property definitions).

Nodal transformation

Nodal transformations (

“

Transformed coordinate systems,

”

Section 2.1.5

) are not

imported;

transformations

can

be

defined

independently

in

the

import

analysis.

Continuous

displacements,

velocities,

etc.

are

obtained

only

if

the

nodal

transformations in the import analysis are the same as those in the original analysis.

Use of the same transformations is also recommended for nodes with boundary

conditions or point loads defined in a local system.

Specifying geometric nonlinearity in an import analysis

By

default,

Abaqus/Standard

uses

a

small-strain

formulation

(i.e.,

geometric

nonlinearity is ignored) and Abaqus/Explicit uses a large- deformation formulation

(i.e.,

geometric

nonlinearity

is

included).

For

each

step

of

an

analysis

you

can

specify

which

formulation

should

be

used;

see

“Geometric

nonlinearity”

in

“General and linear perturbation procedures,”

Section 6.1.2

, for details.

The default value for the formulation in an import analysis is the same as the value

at the time of import. Once the large-displacement formulation is used during a

given step in any analysis, it will remain active in all the subsequent steps, whether

or not the analysis is imported.

If the small- displacement formulation is used at the time of import, the reference

configuration cannot be updated.

Specifying initial conditions for imported elements and nodes

Initial

conditions

(

“

Initial

conditions

in

Abaqus/Standard

and

Abaqus/Explicit,

”

Section

30.2.1

)

can

be

specified

on

the

imported

elements

or

nodes

only

under

certain

conditions.

Table

9.2.2

–