contact Module

Defines the following contact cards:

• BCONP

• BLSEG

• BCRPARA

• BCTPARA

• BCTADD

• BCTSET

• BSURF

• BSURFS

• BFRIC

class pyNastran.bdf.cards.contact.BCONP(contact_id, slave, master, sfac, friction_id, ptype, cid, comment='')

Bases: pyNastran.bdf.cards.base_card.BaseCard

3D Contact Region Definition by Shell Elements (SOLs 101, 601 and 701)

Defines a 3D contact region by shell element IDs.

1	2	3	4	5	6	7	8	9
BCONP	ID	SLAVE	MASTER		SFAC	FRICID	PTYPE	CID
BCONP	95	10	15		1.0	33	1

Cid() → int

FrictionId() → int

Master() → int

Slave() → int

classmethod _init_from_empty()

classmethod add_card(card, comment='')

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

Parameters

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

cross_reference(model: BDF) → None

raw_fields()

type = 'BCONP'

uncross_reference() → None

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.contact.BCRPARA(crid, offset=None, surf='TOP', Type='FLEX', grid_point=0, comment='')

Bases: pyNastran.bdf.cards.base_card.BaseCard

1	2	3	4	5	6	7	8	9	10
BCRPARA	CRID	SURF	OFFSET	TYPE	GP

Creates a BCRPARA card

Parameters

cridint

CRID Contact region ID.

offsetfloat; default=None

Offset distance for the contact region (Real > 0.0). None : OFFSET value in BCTPARA entry

surfstr; default=’TOP’

SURF Indicates the contact side. See Remark 1. {‘TOP’, ‘BOT’; )

Typestr; default=’FLEX’

Indicates whether a contact region is a rigid surface if it is used as a target region. {‘RIGID’, ‘FLEX’}. This is not supported for SOL 101.

grid_pointint; default=0

Control grid point for a target contact region with TYPE=RIGID or when the rigid-target algorithm is used. The grid point may be used to control the motion of a rigid surface. (Integer > 0). This is not supported for SOL 101.

commentstr; default=’’

a comment for the card

Type = None

Indicates whether a contact region is a rigid surface if it is used as a target region. See Remarks 3 and 4. (Character = “RIGID” or “FLEX”, Default = “FLEX”). This is not supported for SOL 101.

classmethod _init_from_empty()

classmethod add_card(card, comment='')

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

Parameters

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

crid = None

CRID Contact region ID. (Integer > 0)

grid_point = None

Control grid point for a target contact region with TYPE=RIGID or when the rigid-target algorithm is used. The grid point may be used to control the motion of a rigid surface. (Integer > 0) This is not supported for SOL 101.

offset = None

Offset distance for the contact region. See Remark 2. (Real > 0.0, Default =OFFSET value in BCTPARA entry)

raw_fields()

surf = None

SURF Indicates the contact side. See Remark 1. (Character = “TOP” or “BOT”; Default = “TOP”)

type = 'BCRPARA'

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.contact.BCTADD(csid, contact_sets, comment='')

Bases: pyNastran.bdf.cards.base_card.BaseCard

1	2	3	4	5	6	7	8	9
BCTADD	CSID	SI	S2	S3	S4	S5	S6	S7
	S8	S9	etc.

Remarks: 1. To include several contact sets defined via BCTSET entries in a model,

BCTADD must be used to combine the contact sets. CSID in BCTADD is then selected with the Case Control command BCSET.

2. Si must be unique and may not be the identification of this or any other BCTADD entry.

classmethod _init_from_empty()

classmethod add_card(card, comment='')

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

Parameters

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

contact_sets = None

Identification numbers of contact sets defined via BCTSET entries. (Integer > 0)

csid = None

Contact set identification number. (Integer > 0)

raw_fields()

type = 'BCTADD'

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.contact.BCTPARA(csid, params, comment='')

Bases: pyNastran.bdf.cards.base_card.BaseCard

Defines parameters for a surface-to-surface contact region.

1	2	3	4	5	6	7	8
BCTPARA	CSID	Param1	Value1	Param2	Value2	Param3	Value3
	Param4	Value4	Param5	Value5	etc.
BCTPARA	1	TYPE	0	NSIDE	2	SEGNORM	-1
	CSTIFF	1	OFFSET	0.015

Creates a BCTPARA card

Parameters

csidint

Contact set ID. Parameters defined in this command apply to contact set CSID defined by a BCTSET entry. (Integer > 0)

paramsdict[key]value

the optional parameters

commentstr; default=’’

a comment for the card

_finalize_hdf5(encoding)

hdf5 helper function

classmethod _init_from_empty()

classmethod add_card(card, comment='')

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

Parameters

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

csid = None

Contact set ID. Parameters defined in this command apply to contact set CSID defined by a BCTSET entry. (Integer > 0)

raw_fields()

type = 'BCTPARA'

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.contact.BCTSET(csid, sids, tids, frictions, min_distances, max_distances, comment='', sol=101)

Bases: pyNastran.bdf.cards.base_card.BaseCard

3D Contact Set Definition (SOLs 101, 601 and 701 only) Defines contact pairs of a 3D contact set.

1	2	3	4	5	6	7
BCTSET	CSID	SID1	TID1	FRIC1	MIND1	MAXD1
		SID2 | TID2		FRIC2	MIND2	MAXD2
	etc.

classmethod _init_from_empty()

classmethod add_card(card, comment='', sol=101)

csid = None

CSID Contact set identification number. (Integer > 0)

frictions = None

FRICi Static coefficient of friction for contact pair i. (Real; Default=0.0)

max_distances = None

MAXDi Maximum search distance for contact. (Real) (Sol 101 only)

min_distances = None

MINDi Minimum search distance for contact. (Real) (Sol 101 only)

raw_fields()

sids = None

SIDi Source region (contactor) identification number for contact pair i. (Integer > 0)

tids = None

TIDi Target region identification number for contact pair i. (Integer > 0)

type = 'BCTSET'

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.contact.BFRIC(friction_id: int, mu1: float, fstiff=None, comment='')

Bases: pyNastran.bdf.cards.base_card.BaseCard

Slideline Contact Friction Defines frictional properties between two bodies in contact.

1	2	3	4	5
BFRIC	FID	FSTIF		MU1

Creates a BFRIC card, which defines a frictional contact.

Parameters

friction_idint

Friction identification number.

mu1float

Coefficient of static friction.

fstifffloat; default=None

Frictional stiffness in stick. See Remarks 2 and 3 Default=automatically selected by the program.

classmethod _init_from_empty()

classmethod add_card(card, comment='')

raw_fields()

type = 'BFRIC'

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.contact.BLSEG(line_id, nodes, comment='')

Bases: pyNastran.bdf.cards.base_card.BaseCard

3D Contact Region Definition by Shell Elements (SOLs 101, 601 and 701)

Defines a 3D contact region by shell element IDs.

+=======+====+====+======+====+====+=====+====+====+ | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | +——-+—-+—-+——+—-+—-+—–+—-+—-+ | BLSEG | ID | G1 | G2 | G3 | G4 | G5 | G6 | G7 | +——-+—-+—-+——+—-+—-+—–+—-+—-+ | BLSEG | ID | G1 | THRU | G2 | BY | INC | | | +——-+—-+—-+——+—-+—-+—–+—-+—-+

classmethod _init_from_empty()

classmethod add_card(card, comment='')

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

Parameters

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

cross_reference(model: BDF) → None

property node_ids

returns nodeIDs for repr functions

raw_fields()

type = 'BLSEG'

uncross_reference() → None

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.contact.BSURF(sid, eids, comment='')

Bases: pyNastran.bdf.cards.base_card.BaseCard

3D Contact Region Definition by Shell Elements (SOLs 101, 601 and 701)

Defines a 3D contact region by shell element IDs.

1	2	3	4	5	6	7	8	9
BSURF	ID	EID1	EID2	EID3	EID4	EID5	EID6	EID7
	EID8	EID9	EID10	etc.
BSURF	ID	EID1	THRU	EID2	BY	INC
	EID8	EID9	EID10	EID11	etc.
	EID8	THRU	EID9	BY	INC
BSURF	15	5	THRU	21	BY	4
	27	30	32	33
	35	THRU	44
	67	68	70	85	92

classmethod _init_from_empty()

classmethod add_card(card, comment='')

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

Parameters

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

eids = None

Element identification numbers of shell elements. (Integer > 0)

raw_fields()

sid = None

Set identification number. (Unique Integer > 0)

type = 'BSURF'

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.contact.BSURFS(bsurfs_id, eids, g1s, g2s, g3s, comment='')

Bases: pyNastran.bdf.cards.base_card.BaseCard

Defines a 3D contact region by the faces of the CHEXA, CPENTA or CTETRA elements.

Notes

1. The continuation field is optional.

2. BSURFS is a collection of one or more element faces on solid elements. BSURFS defines a contact region which may act as a contact source (contactor) or target.

3. The ID must be unique with respect to all other BSURFS, BSURF, and BCPROP entries.

classmethod _init_from_empty()

classmethod add_card(card, comment='')

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

Parameters

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

eids = None

Element identification numbers of solid elements. (Integer > 0)

g1s = None

Identification numbers of 3 corner grid points on the face (triangular or quadrilateral) of the solid element. (Integer > 0)

id = None

Identification number of a contact region. See Remarks 2 and 3. (Integer > 0)

raw_fields()

type = 'BSURFS'

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