springs Module

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All spring elements are defined in this file. This includes:

• CELAS1

• CELAS2

• CELAS3

• CELAS4

All spring elements are SpringElement and Element objects.

class pyNastran.bdf.cards.elements.springs.CELAS1(eid, pid, nids, c1=0, c2=0, comment='')

Bases: SpringElement

1	2	3	4	5	6	7
CELAS1	EID	PID	G1	C1	G2	C2

Creates a CELAS1 card

Parameters:

eidint

element id

pidint

property id (PELAS)

nidslist[int, int]

node ids

c1 / c2int; default=0

DOF for nid1 / nid2

commentstr; default=’’

a comment for the card

K()

classmethod add_card(card, comment='')

Adds a CELAS1 card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

c1

component number

cross_reference(model: BDF) → None

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

classmethod export_to_hdf5(h5_file, model, eids)

exports the elements in a vectorized way

get_edge_ids()

property node_ids

raw_fields()

safe_cross_reference(model: BDF, xref_errors)

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

type = 'CELAS1'

uncross_reference() → None

Removes cross-reference links

validate()

card checking method that should be overwritten

write_card(size: int = 8, is_double: bool = False) → str

Writes the card with the specified width and precision

Parameters:

sizeint (default=8)

size of the field; {8, 16}

is_doublebool (default=False)

is this card double precision

Returns:

msgstr

the string representation of the card

class pyNastran.bdf.cards.elements.springs.CELAS2(eid, k, nids, c1=0, c2=0, ge=0.0, s=0.0, comment='')

Bases: SpringElement

1	2	3	4	5	6	7	8	9
CELAS2	EID	K	G1	C1	G2	C2	GE	S

Creates a CELAS2 card

Parameters:

eidint

element id

kfloat

spring stiffness

nidslist[int, int]

SPOINT ids node ids

c1 / c2int; default=0

DOF for nid1 / nid2

geint; default=0.0

damping coefficient

sfloat; default=0.0

stress coefficient

commentstr; default=’’

a comment for the card

K()

classmethod add_card(card, comment='')

Adds a CELAS2 card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

c1

component number

cp_name_map = {'GE': 'ge', 'K': 'k', 'S': 's'}

cross_reference(model: BDF) → None

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

classmethod export_to_hdf5(h5_file, model, eids)

exports the elements in a vectorized way

ge

damping coefficient

get_edge_ids()

k

stiffness of the scalar spring

property node_ids

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

s

stress coefficient

safe_cross_reference(model: BDF, xref_errors)

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

type = 'CELAS2'

uncross_reference() → None

Removes cross-reference links

validate()

card checking method that should be overwritten

write_card(size: int = 8, is_double: bool = False) → str

Writes the card with the specified width and precision

Parameters:

sizeint (default=8)

size of the field; {8, 16}

is_doublebool (default=False)

is this card double precision

Returns:

msgstr

the string representation of the card

class pyNastran.bdf.cards.elements.springs.CELAS3(eid, pid, nodes, comment='')

Bases: SpringElement

1	2	3	4	5
CELAS3	EID	PID	S1	S2

Creates a CELAS3 card

Parameters:

eidint

element id

pidint

property id (PELAS)

nidslist[int, int]

SPOINT ids

commentstr; default=’’

a comment for the card

K()

classmethod add_card(card, comment='')

Adds a CELAS3 card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

cross_reference(model: BDF) → None

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

classmethod export_to_hdf5(h5_file, model, eids)

exports the elements in a vectorized way

get_edge_ids()

property node_ids

nodes

Scalar point identification numbers

raw_fields()

safe_cross_reference(model: BDF, xref_errors)

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

type = 'CELAS3'

uncross_reference() → None

Removes cross-reference links

write_card(size: int = 8, is_double: bool = False) → str

Writes the card with the specified width and precision

Parameters:

sizeint (default=8)

size of the field; {8, 16}

is_doublebool (default=False)

is this card double precision

Returns:

msgstr

the string representation of the card

class pyNastran.bdf.cards.elements.springs.CELAS4(eid, k, nodes, comment='')

Bases: SpringElement

1	2	3	4	5
CELAS4	EID	K	S1	S2

Creates a CELAS4 card

Parameters:

eidint

element id

kfloat

spring stiffness

nidslist[int, int]

SPOINT ids

commentstr; default=’’

a comment for the card

K()

classmethod add_card(card, comment='')

Adds a CELAS4 card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

cp_name_map = {'K': 'k'}

cross_reference(model: BDF) → None

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

classmethod export_to_hdf5(h5_file, model, eids)

exports the elements in a vectorized way

get_edge_ids()

k

stiffness of the scalar spring

property node_ids

raw_fields()

safe_cross_reference(model: BDF, xref_errors)

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

type = 'CELAS4'

uncross_reference() → None

Removes cross-reference links

validate()

card checking method that should be overwritten

write_card(size: int = 8, is_double: bool = False) → str

Writes the card with the specified width and precision

Parameters:

sizeint (default=8)

size of the field; {8, 16}

is_doublebool (default=False)

is this card double precision

Returns:

msgstr

the string representation of the card

class pyNastran.bdf.cards.elements.springs.SpringElement

Bases: Element

dummy init

Mass()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

write_card_16(is_double=False)