rods Module

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All beam properties are defined in this file. This includes:

• PBEAM

• PBEAML

• PBAR

• PBARL

All beams are Property objects. Multi-segment beams are IntegratedLineProperty objects.

class pyNastran.bdf.cards.properties.rods.PROD(pid, mid, A, j=0.0, c=0.0, nsm=0.0, comment='')

Bases: Property

1	2	3	4	5	6	7
PROD	PID	MID	A	J	C	NSM
PROD	1	2	2.0	3.0	0.5	1.0

Creates a PROD card

Parameters:

pidint

property id

midint

material id

Afloat

area

Jfloat; default=0.

polar moment of inertia

cfloat; default=0.

stress factor

nsmfloat; default=0.

nonstructural mass per unit length

commentstr; default=’’

a comment for the card

Area()

C()

E()

G()

J()

MassPerLength()

Gets the mass per length \(\frac{m}{L}\) of the CBEAM.

\[\frac{m}{L} = A \rho + nsm\]

Nsm()

Rho()

classmethod add_card(card, comment='')

Adds a PROD 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, pids)

exports the properties in a vectorized way

pname_fid_map = {'A': 'A', 'C': 'c', 'J': 'j', 4: 'A', 5: 'J', 6: 'C'}

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

safe_cross_reference(model: BDF, xref_errors)

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

type = 'PROD'

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

write_card_16(is_double=False)

class pyNastran.bdf.cards.properties.rods.PTUBE(pid, mid, OD1, t=None, nsm=0.0, OD2=None, comment='')

Bases: Property

1	2	3	4	5	6	7
PTUBE	PID	MID	OD	T	NSM	OD2
PTUBE	2	6	6.29	0.25

Adds a PTUBE card

Parameters:

pidint

property id

midint

material id

OD1float

outer diameter at End A

tfloat; default=None -> OD1/2.

thickness

nsmfloat; default=0.

non-structural mass per unit length

OD2float; default=None -> OD1

outer diameter at End B

commentstr; default=’’

a comment for the card

Area()

Gets the area \(A\) of the CTUBE.

\[A_1 = \pi \frac{d_1^2}{4} - \pi {(D_1-2t)^2}{4}\]

\[A_2 = \pi \frac{d_2^2}{4} - \pi {(D_2-2t)^2}{4}\]

\[A = A_1 + A_2\]

E()

G()

J()

MassPerLength()

Gets the mass per length \(\frac{m}{L}\) of the CTUBE.

\[\frac{m}{L} = (A \rho) nsm\]

Nsm()

Gets the non-structural mass \(nsm\) of the CTUBE.

Rho()

Gets the density :math:`

ho` of the CTUBE.

_area1()

Gets the Area of Section 1 of the CTUBE.

_area2()

Gets the Area of Section 2 of the CTUBE.

classmethod add_card(card, comment='')

Adds a PTUBE 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, pids)

exports the properties in a vectorized way

pname_fid_map = {'OD': 'OD1', 'OD2': 'OD2', 'T': 't', 4: 'OD1', 5: 't', 7: 'OD2'}

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

safe_cross_reference(model: BDF, xref_errors)

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

type = 'PTUBE'

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