`rigid` Module¶

Inheritance diagram of pyNastran.bdf.cards.elements.rigid

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

RBAR

RBAR1

RBE1

RBE2

RBE3

RSPLINE

RSSCON

All rigid elements are RigidElement and Element objects.

class pyNastran.bdf.cards.elements.rigid.RBAR(eid, nids, cna, cnb, cma, cmb, alpha=0.0, comment='')[source]¶

Bases: pyNastran.bdf.cards.elements.rigid.RigidElement

Defines a rigid bar with six degrees-of-freedom at each end.

1	2	3	4	5	6	7	8	9
RBAR	EID	GA	GB	CNA	CNB	CMA	CMB	ALPHA
RBAR	5	1	2	123456				6.5-6

Creates a RBAR element

Parameters:	eid : int element id nids : List[int, int] node ids; connected grid points at ends A and B cna / cnb : str independent DOFs in ‘123456’ cma / cmb : str dependent DOFs in ‘123456’ alpha : float; default=0.0 coefficient of thermal expansion comment : str; default=’‘ a comment for the card

Ga(self)[source]¶

Gb(self)[source]¶

classmethod _init_from_empty()[source]¶

_properties = ['dependent_nodes', 'independent_nodes', 'nodes']¶

classmethod add_card(card, comment='')[source]¶

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

Parameters:	card : BDFCard() a BDFCard object comment : str; default=’‘ a comment for the card

cross_reference(self, model)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

dependent_nodes¶: gets the dependent node ids

independent_nodes¶: gets the independent node ids

nodes¶

raw_fields(self)[source]¶

repr_fields(self)[source]¶

Gets the fields in their simplified form

Returns:	fields : List[varies] the fields that define the card

safe_cross_reference(self, model, xref_errors)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

type = 'RBAR'¶

uncross_reference(self)[source]¶: Removes cross-reference links

validate(self)[source]¶: card checking method that should be overwritten

write_card(self, size=8, is_double=False)[source]¶

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.rigid.RBAR1(eid, nids, cb, alpha=0.0, comment='')[source]¶

Bases: pyNastran.bdf.cards.elements.rigid.RigidElement

1	2	3	4	5	6
RBAR1	EID	GA	GB	CB	ALPHA
RBAR1	5	1	2	123	6.5-6

Ga(self)[source]¶

Gb(self)[source]¶

classmethod _init_from_empty()[source]¶

_properties = ['dependent_nodes', 'independent_nodes', 'nodes']¶

classmethod add_card(card, comment='')[source]¶

Adds a RBAR1 card from BDF.add_card(...)

Parameters:	card : BDFCard() a BDFCard object comment : str; default=’‘ a comment for the card

cross_reference(self, model)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

dependent_nodes¶: gets the dependent node ids

independent_nodes¶: gets the independent node ids

raw_fields(self)[source]¶

repr_fields(self)[source]¶

Gets the fields in their simplified form

Returns:	fields : List[varies] the fields that define the card

safe_cross_reference(self, model, xref_errors)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

type = 'RBAR1'¶

uncross_reference(self)[source]¶: Removes cross-reference links

write_card(self, size=8, is_double=False)[source]¶

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.rigid.RBE1(eid, Gni, Cni, Gmi, Cmi, alpha=0.0, comment='')[source]¶

Bases: pyNastran.bdf.cards.elements.rigid.RigidElement

1	2	3	4	5	6	7	8
RBE1	EID	GN1	CN1	GN2	CN2	GN3	CN3
		GN4	CN4	GN5	CN5	GN6	CN6
	UM	GM1	CM1	GM2	CM2	GM3	CM3
	GM4	CM4	etc	ALPHA

RBE1	59	59	123	60	456
	UM	61	246

Creates an RBE1 element

Parameters:	eid : int element id Gni : List[int] independent node ids Cni : List[str] the independent components (e.g., ‘123456’) Gmi : List[int] dependent node ids Cmi : List[str] the dependent components (e.g., ‘123456’) alpha : float; default=0. thermal expansion coefficient comment : str; default=’‘ a comment for the card

Gmi_node_ids¶

Gni_node_ids¶

classmethod _init_from_empty()[source]¶

_properties = ['Gmi_node_ids', 'Gni_node_ids', 'dependent_nodes', 'independent_nodes']¶

classmethod add_card(card, comment='')[source]¶

Adds a RBE1 card from BDF.add_card(...)

Parameters:	card : BDFCard() a BDFCard object comment : str; default=’‘ a comment for the card

cross_reference(self, model)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

dependent_nodes¶: gets the dependent node ids

independent_nodes¶: gets the independent node ids

raw_fields(self)[source]¶

repr_fields(self)[source]¶

Gets the fields in their simplified form

Returns:	fields : List[varies] the fields that define the card

safe_cross_reference(self, model, xref_errors)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

type = 'RBE1'¶

uncross_reference(self)[source]¶: Removes cross-reference links

write_card(self, size=8, is_double=False)[source]¶

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.rigid.RBE2(eid, gn, cm, Gmi, alpha=0.0, comment='')[source]¶

Bases: pyNastran.bdf.cards.elements.rigid.RigidElement

1	2	3	4	5	6	7	8	9
RBE2	EID	GN	CM	GM1	GM2	GM3	GM4	GM5
	GM6	GM7	GM8	etc.	ALPHA

Creates an RBE2 element

Parameters:	eid : int element id gn : int Identification number of grid point to which all six independent degrees-of-freedom for the element are assigned. cm : str Component numbers of the dependent degrees-of-freedom in the global coordinate system at grid points GMi. Gmi : List[int] dependent nodes alpha : float; default=0.0 ???

Gmi_node_ids¶

Gn(self)[source]¶

classmethod _init_from_empty()[source]¶

_properties = ['Gmi_node_ids', 'dependent_nodes', 'independent_nodes']¶

classmethod add_card(card, comment='')[source]¶

Adds a RBE2 card from BDF.add_card(...)

Parameters:	card : BDFCard() a BDFCard object comment : str; default=’‘ a comment for the card

cm = None¶: Component numbers of the dependent degrees-of-freedom in the global coordinate system at grid points GMi. (Integers 1 through 6 with no embedded blanks.)

convert_to_mpc(self, mpc_id)[source]¶

\[-A_i u_i + A_j u_j = 0\]

where \(u_i\) are the base DOFs (max=6)

1 2 3 4 5 6 7 8

MPC sid g1 c1 a1 g2 c2 a2

RBE2 eid gn cm g1 g2 g3 g4

cross_reference(self, model)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

dependent_nodes¶: gets the dependent node ids

eid = None¶: Element identification number

gn = None¶: Identification number of grid point to which all six independent degrees-of-freedom for the element are assigned. (Integer > 0)

independent_nodes¶: gets the independent node ids

raw_fields(self)[source]¶

repr_fields(self)[source]¶

Gets the fields in their simplified form

Returns:	fields : List[varies] the fields that define the card

safe_cross_reference(self, model, xref_errors)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

type = 'RBE2'¶

uncross_reference(self)[source]¶: Removes cross-reference links

update(self, maps)[source]¶: Updates the card without xref

validate(self)[source]¶: card checking method that should be overwritten

write_card(self, size=8, is_double=False)[source]¶

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

write_card_16(self, is_double=False)[source]¶

class pyNastran.bdf.cards.elements.rigid.RBE3(eid, refgrid, refc, weights, comps, Gijs, Gmi=None, Cmi=None, alpha=0.0, comment='')[source]¶

Bases: pyNastran.bdf.cards.elements.rigid.RigidElement

Todo

not done, needs testing badly

1	2	3	4	5	6	7	8	9
RBE3	EID		REFGRID	REFC	WT1	C1	G1,1	G1,2
	G1,3	WT2	C2	G2,1	G2,2	etc.	WT3	C3
	G3,1	G3,2	etc.	WT4	C4	G4,1	G4,2	etc.
	‘UM’	GM1	CM1	GM2	CM2	GM3	CM3
	GM4	CM4	GM5	CM5	etc.
	‘ALPHA’	ALPHA

Creates an RBE3 element

Parameters:

eid : int: element id
refgrid : int: dependent node
refc : str: dependent components for refgrid???
GiJs : List[int, …, int]: independent nodes
comps : List[str, …, str]: independent components
weights : List[float, …, float]: weights for the importance of the DOF
Gmi : List[int, …, int]; default=None -> []: dependent nodes / UM Set
Cmi : List[str, …, str]; default=None -> []: dependent components / UM Set
alpha : float; default=0.0: thermal expansion coefficient
comment : str; default=’‘: a comment for the card

Gijs_node_ids¶

Gmi_node_ids¶

classmethod _init_from_empty()[source]¶

_properties = ['wt_cg_groups', 'ref_grid_id', 'Gijs_node_ids', 'dependent_nodes', 'independent_nodes']¶

classmethod add_card(card, comment='')[source]¶

Adds a RBE3 card from BDF.add_card(...)

Parameters:	card : BDFCard() a BDFCard object comment : str; default=’‘ a comment for the card

cross_reference(self, model)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

dependent_nodes¶: gets the dependent node ids TODO: not checked

independent_nodes¶: gets the independent node ids TODO: not checked

raw_fields(self)[source]¶

ref_grid_id¶

repr_fields(self)[source]¶

Gets the fields in their simplified form

Returns:	fields : List[varies] the fields that define the card

safe_cross_reference(self, model, debug=True)[source]¶

type = 'RBE3'¶

uncross_reference(self)[source]¶: Removes cross-reference links

write_card(self, size=8, is_double=False)[source]¶

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

wt_cg_groups¶

class pyNastran.bdf.cards.elements.rigid.RROD(eid, nids, cma=None, cmb=None, alpha=0.0, comment='')[source]¶

Bases: pyNastran.bdf.cards.elements.rigid.RigidElement

Rigid Pin-Ended Element Connection Defines a pin-ended element that is rigid in translation

1	2	3	4	5	6	7
RROD	EID	GA	GB	CMA	CMB	ALPHA
RROD	5	1	2			6.5-6

Creates a RROD element

Parameters:	eid : int element id nids : List[int, int] node ids; connected grid points at ends A and B cma / cmb : str; default=None dependent DOF must be in [None, ‘1’, ‘2’, ‘3’] one of them must be None alpha : float; default=0.0 coefficient of thermal expansion comment : str; default=’‘ a comment for the card

Ga(self)[source]¶

Gb(self)[source]¶

classmethod _init_from_empty()[source]¶

_properties = ['dependent_nodes', 'independent_nodes']¶

classmethod add_card(card, comment='')[source]¶

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

Parameters:	card : BDFCard() a BDFCard object comment : str; default=’‘ a comment for the card

cross_reference(self, model)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

dependent_nodes¶: gets the dependent node ids

independent_nodes¶: gets the independent node ids

raw_fields(self)[source]¶

repr_fields(self)[source]¶

Gets the fields in their simplified form

Returns:	fields : List[varies] the fields that define the card

safe_cross_reference(self, model, xref_errors)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

type = 'RROD'¶

uncross_reference(self)[source]¶: Removes cross-reference links

validate(self)[source]¶: card checking method that should be overwritten

write_card(self, size=8, is_double=False)[source]¶

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.rigid.RSPLINE(eid, independent_nid, dependent_nids, dependent_components, diameter_ratio=0.1, comment='')[source]¶

Bases: pyNastran.bdf.cards.elements.rigid.RigidElement

Creates a RSPLINE card, which uses multipoint constraints for the interpolation of displacements at grid points

Parameters:	eid : int element id independent_nid : int the independent node id dependent_nids : List[int] the dependent node ids dependent_components : List[str] Components to be constrained diameter_ratio : float; default=0.1 Ratio of the diameter of the elastic tube to the sum of the lengths of all segments comment : str; default=’‘ a comment for the card

classmethod _init_from_empty()[source]¶

_properties = ['dependent_nodes', 'independent_nodes']¶

Defines multipoint constraints for the interpolation of displacements at grid points.

1	2	3	4	5	6	7	8	9
RSPLINE	EID	D/L	G1	G2	C2	G3	C3	G4
	C4	G5	C5	G6	etc.

classmethod add_card(card, comment='')[source]¶

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

Parameters:	card : BDFCard() a BDFCard object comment : str; default=’‘ a comment for the card

cross_reference(self, model)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

dependent_nodes¶: gets the dependent node ids

independent_nodes¶: gets the independent node ids

raw_fields(self)[source]¶

repr_fields(self)[source]¶

Gets the fields in their simplified form

Returns:	fields : List[varies] the fields that define the card

safe_cross_reference(self, model, xref_errors)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

type = 'RSPLINE'¶

uncross_reference(self)[source]¶: Removes cross-reference links

validate(self)[source]¶: card checking method that should be overwritten

write_card(self, size=8, is_double=False)[source]¶

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.rigid.RSSCON(eid, rigid_type, shell_eid=None, solid_eid=None, a_solid_grids=None, b_solid_grids=None, shell_grids=None, comment='')[source]¶

Bases: pyNastran.bdf.cards.elements.rigid.RigidElement

Creates an RSSCON card, which defines multipoint constraints to model clamped connections of shell-to-solid elements.

Parameters:	eid : int element id rigid_type : str GRID/ELEM shell/solid_eid : int; default=None the shell/solid element id (if rigid_type=ELEM) shell/solid_grids : List[int, int]; default=None the shell/solid node ids (if rigid_type=GRID) comment : str; default=’‘ a comment for the card B—-S—-A

EidShell(self)[source]¶

EidSolid(self)[source]¶

classmethod _init_from_empty()[source]¶

classmethod add_card(card, comment='')[source]¶

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

Parameters:	card : BDFCard() a BDFCard object comment : str; default=’‘ a comment for the card

cross_reference(self, model)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

dependent_nodes¶: gets the dependent node ids

independent_nodes¶: gets the independent node ids

raw_fields(self)[source]¶

repr_fields(self)[source]¶

Gets the fields in their simplified form

Returns:	fields : List[varies] the fields that define the card

safe_cross_reference(self, model, xref_errors)[source]¶

Cross links the card so referenced cards can be extracted directly

Parameters:	model : BDF() the BDF object

type = 'RSSCON'¶

Defines multipoint constraints to model clamped connections of shell-to-solid elements.

1	2	3	4	5	6	7	8	9
RSSCON	RBID	TYPE	ES1	EA1	EB1	ES2	EA2	EB2
RSSCON	110	GRID	11	12	13	14	15	16
RSSCON	111	GRID	31	74	75
RSSCON	115	ELEM	311	741
RSSCON	116	INTC	2	1	3

uncross_reference(self)[source]¶: Removes cross-reference links

write_card(self, size=8, is_double=False)[source]¶

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.rigid.RigidElement[source]¶

Bases: pyNastran.bdf.cards.base_card.Element

dummy init

cross_reference(self, model)[source]¶

rigid Module¶

`rigid` Module¶