springs Module

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: pyNastran.bdf.cards.elements.springs.SpringElement

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CELAS1	EID	PID	G1	C1	G2	C2

Creates a CELAS1 card

Parameters:

eid : int

element id

pid : int

property id (PELAS)

nids : List[int, int]

node ids

c1 / c2 : int; default=0

DOF for nid1 / nid2

comment : str; default=’‘

a comment for the card

K(self)

classmethod add_card(card, comment='')

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

Parameters:

card : BDFCard()

a BDFCard object

comment : str; default=’‘

a comment for the card

c1 = None

component number

cross_reference(self, model)

Cross links the card so referenced cards can be extracted directly

Parameters:

model : BDF()

the BDF object

classmethod export_to_hdf5(h5_file, model, eids)

exports the elements in a vectorized way

get_edge_ids(self)

node_ids

raw_fields(self)

safe_cross_reference(self, model, xref_errors)

Cross links the card so referenced cards can be extracted directly

Parameters:

model : BDF()

the BDF object

type = 'CELAS1'

uncross_reference(self)

Removes cross-reference links

validate(self)

card checking method that should be overwritten

write_card(self, size=8, is_double=False)

Writes the card with the specified width and precision

Parameters:

size : int (default=8)

size of the field; {8, 16}

is_double : bool (default=False)

is this card double precision

Returns:

msg : str

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: pyNastran.bdf.cards.elements.springs.SpringElement

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CELAS2	EID	K	G1	C1	G2	C2	GE	S

Creates a CELAS2 card

Parameters:

eid : int

element id

k : float

spring stiffness

nids : List[int, int]

SPOINT ids node ids

c1 / c2 : int; default=0

DOF for nid1 / nid2

ge : int; default=0.0

damping coefficient

s : float; default=0.0

stress coefficient

comment : str; default=’‘

a comment for the card

K(self)

classmethod add_card(card, comment='')

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

Parameters:

card : BDFCard()

a BDFCard object

comment : str; default=’‘

a comment for the card

c1 = None

component number

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

cross_reference(self, model)

Cross links the card so referenced cards can be extracted directly

Parameters:

model : BDF()

the BDF object

classmethod export_to_hdf5(h5_file, model, eids)

exports the elements in a vectorized way

ge = None

damping coefficient

get_edge_ids(self)

k = None

stiffness of the scalar spring

node_ids

raw_fields(self)

repr_fields(self)

Gets the fields in their simplified form

Returns:

fields : List[varies]

the fields that define the card

s = None

stress coefficient

safe_cross_reference(self, model, xref_errors)

Cross links the card so referenced cards can be extracted directly

Parameters:

model : BDF()

the BDF object

type = 'CELAS2'

uncross_reference(self)

Removes cross-reference links

validate(self)

card checking method that should be overwritten

write_card(self, size=8, is_double=False)

Writes the card with the specified width and precision

Parameters:

size : int (default=8)

size of the field; {8, 16}

is_double : bool (default=False)

is this card double precision

Returns:

msg : str

the string representation of the card

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

Bases: pyNastran.bdf.cards.elements.springs.SpringElement

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CELAS3	EID	PID	S1	S2

Creates a CELAS3 card

Parameters:

eid : int

element id

pid : int

property id (PELAS)

nids : List[int, int]

SPOINT ids

comment : str; default=’‘

a comment for the card

K(self)

classmethod add_card(card, comment='')

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

Parameters:

card : BDFCard()

a BDFCard object

comment : str; default=’‘

a comment for the card

cross_reference(self, model)

Cross links the card so referenced cards can be extracted directly

Parameters:

model : BDF()

the BDF object

classmethod export_to_hdf5(h5_file, model, eids)

exports the elements in a vectorized way

get_edge_ids(self)

node_ids

nodes = None

Scalar point identification numbers

raw_fields(self)

safe_cross_reference(self, model, xref_errors)

Cross links the card so referenced cards can be extracted directly

Parameters:

model : BDF()

the BDF object

type = 'CELAS3'

uncross_reference(self)

Removes cross-reference links

write_card(self, size=8, is_double=False)

Writes the card with the specified width and precision

Parameters:

size : int (default=8)

size of the field; {8, 16}

is_double : bool (default=False)

is this card double precision

Returns:

msg : str

the string representation of the card

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

Bases: pyNastran.bdf.cards.elements.springs.SpringElement

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CELAS4	EID	K	S1	S2

Creates a CELAS4 card

Parameters:

eid : int

element id

k : float

spring stiffness

nids : List[int, int]

SPOINT ids

comment : str; default=’‘

a comment for the card

K(self)

classmethod add_card(card, comment='')

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

Parameters:

card : BDFCard()

a BDFCard object

comment : str; default=’‘

a comment for the card

cp_name_map = {'K': 'k'}

cross_reference(self, model)

Cross links the card so referenced cards can be extracted directly

Parameters:

model : BDF()

the BDF object

classmethod export_to_hdf5(h5_file, model, eids)

exports the elements in a vectorized way

get_edge_ids(self)

k = None

stiffness of the scalar spring

node_ids

raw_fields(self)

safe_cross_reference(self, model, xref_errors)

Cross links the card so referenced cards can be extracted directly

Parameters:

model : BDF()

the BDF object

type = 'CELAS4'

uncross_reference(self)

Removes cross-reference links

validate(self)

card checking method that should be overwritten

write_card(self, size=8, is_double=False)

Writes the card with the specified width and precision

Parameters:

size : int (default=8)

size of the field; {8, 16}

is_double : bool (default=False)

is this card double precision

Returns:

msg : str

the string representation of the card

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

Bases: pyNastran.bdf.cards.base_card.Element

Mass(self)

repr_fields(self)

Gets the fields in their simplified form

Returns:

fields : List[varies]

the fields that define the card

write_card_16(self, is_double=False)