bars Module¶
- All bar properties are defined in this file. This includes:
- PBAR
- PBARL
- PBEAM3
- PBEND
- PBRSECT
All bars are LineProperty objects. Multi-segment beams are IntegratedLineProperty objects.
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pyNastran.bdf.cards.properties.bars.A_I1_I2_I12(prop, beam_type, dim)[source]¶ BAR 2 ^ | *---|--* | | | | | | |h *-----------> 1 | | | b | *------*
\[I_1 = \frac{1}{12} b h^3\]\[I_2 = \frac{1}{12} h b^3\]
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class
pyNastran.bdf.cards.properties.bars.PBAR(pid, mid, A=0.0, i1=0.0, i2=0.0, i12=0.0, j=0.0, nsm=0.0, c1=0.0, c2=0.0, d1=0.0, d2=0.0, e1=0.0, e2=0.0, f1=0.0, f2=0.0, k1=100000000.0, k2=100000000.0, comment='')[source]¶ Bases:
pyNastran.bdf.cards.properties.bars.LinePropertyDefines the properties of a simple beam element (CBAR entry).
1 2 3 4 5 6 7 8 9 PBAR PID MID A I1 I2 J NSM C1 C2 D1 D2 E1 E2 F1 F2 K1 K2 I12 Todo
support solution 600 default do a check for mid -> MAT1 for structural do a check for mid -> MAT4/MAT5 for thermal
Creates a PBAR card
Parameters: - pid : int
property id
- mid : int
material id
- area : float
area
- i1, i2, i12, j : float
moments of inertia
- nsm : float; default=0.
nonstructural mass per unit length
- c1/c2, d1/d2, e1/e2, f1/f2 : float
the y/z locations of the stress recovery points c1 - point C.y c2 - point C.z
- k1 / k2 : float; default=1.e8
Shear stiffness factor K in K*A*G for plane 1/2.
- comment : str; default=’‘
a comment for the card
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A= None¶ Area -> use Area()
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MassPerLength(self)[source]¶ Gets the mass per length \(\frac{m}{L}\) of the CBAR.
\[\frac{m}{L} = \rho A + nsm\]
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classmethod
add_card(card, comment='')[source]¶ Adds a PBAR card from
BDF.add_card(...)Parameters: - card : BDFCard()
a BDFCard object
- comment : str; default=’‘
a comment for the card
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cross_reference(self, model)[source]¶ Cross links the card so referenced cards can be extracted directly
Parameters: - model : BDF()
the BDF object
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classmethod
export_to_hdf5(h5_file, model, pids)[source]¶ exports the properties in a vectorized way
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i1= None¶ I1 -> use I1()
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i12= None¶ I12 -> use I12()
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i2= None¶ I2 -> use I2()
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j= None¶ Polar Moment of Inertia J -> use J() default=1/2(I1+I2) for SOL=600, otherwise 0.0 .. todo:: support SOL 600 default
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k1= None¶ default=infinite; assume 1e8
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k2= None¶ default=infinite; assume 1e8
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mid= None¶ material ID -> use Mid()
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nsm= None¶ nonstructral mass -> use Nsm()
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pid= None¶ property ID -> use Pid()
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pname_fid_map= {4: 'A', 'A': 'A', 5: 'i1', 'I1': 'i1', 6: 'i2', 'I2': 'i2', 7: 'j', 'J': 'j', 10: 'c1', 11: 'c2', 12: 'd1', 13: 'd2', 14: 'e1', 15: 'e2', 16: 'f1', 17: 'f2', 18: 'k1', 19: 'k1', 20: 'i12', 'I12': 'i12'}¶
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repr_fields(self)[source]¶ Gets the fields in their simplified form
Returns: - fields : List[varies]
the fields that define the card
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type= 'PBAR'¶
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class
pyNastran.bdf.cards.properties.bars.PBARL(pid, mid, Type, dim, group='MSCBML0', nsm=0.0, comment='')[source]¶ Bases:
pyNastran.bdf.cards.properties.bars.LinePropertyTodo
doesnt support user-defined types
1 2 3 4 5 6 7 8 9 PBARL PID MID GROUP TYPE DIM1 DIM2 DIM3 DIM4 DIM5 DIM6 DIM7 DIM8 DIM9 etc. NSM Creates a PBARL card, which defines A, I1, I2, I12, and J using dimensions rather than explicit values.
Parameters: - pid : int
property id
- mid : int
material id
- Type : str
type of the bar {ROD, TUBE, TUBE2, I, CHAN, T, BOX, BAR, CROSS, H, T1, I1, CHAN1, Z, CHAN2, T2, BOX1, HEXA, HAT, HAT1, DBOX}
- dim : List[float]
dimensions for cross-section corresponding to Type; the length varies
- group : str; default=’MSCBML0’
this parameter can lead to a very broken deck with a very bad error message; don’t touch it!
- nsm : float; default=0.
non-structural mass
- comment : str; default=’‘
a comment for the card
- The shear center and neutral axis do not coincide when:
- Type = I and dim2 != dim3
- Type = CHAN, CHAN1, CHAN2
- Type = T
- Type = T1, T2
- Type = BOX1
- Type = HAT, HAT1
- Type = DBOX
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MassPerLength(self)[source]¶ Gets the mass per length \(\frac{m}{L}\) of the CBAR.
\[\frac{m}{L} = A \rho + nsm\]
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Type¶ Section Type (e.g. ‘ROD’, ‘TUBE’, ‘I’, ‘H’)
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_properties= ['Type', 'valid_types']¶
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classmethod
add_card(card, comment='')[source]¶ Adds a PBARL card from
BDF.add_card(...)Parameters: - card : BDFCard()
a BDFCard object
- comment : str; default=’‘
a comment for the card
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cross_reference(self, model)[source]¶ Cross links the card so referenced cards can be extracted directly
Parameters: - model : BDF()
the BDF object
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mid= None¶ Material ID
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nsm= None¶ non-structural mass
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pid= None¶ Property ID
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repr_fields(self)[source]¶ Gets the fields in their simplified form
Returns: - fields : List[varies]
the fields that define the card
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type= 'PBARL'¶
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valid_types= {'BAR': 2, 'BOX': 4, 'BOX1': 6, 'CHAN': 4, 'CHAN1': 4, 'CHAN2': 4, 'CROSS': 4, 'DBOX': 10, 'H': 4, 'HAT': 4, 'HAT1': 5, 'HEXA': 3, 'I': 6, 'I1': 4, 'L': 4, 'ROD': 1, 'T': 4, 'T1': 4, 'T2': 4, 'TUBE': 2, 'TUBE2': 2, 'Z': 4}¶
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class
pyNastran.bdf.cards.properties.bars.PBEAM3(pid, mid, A, iz, iy, iyz=None, j=None, nsm=0.0, so=None, cy=None, cz=None, dy=None, dz=None, ey=None, ez=None, fy=None, fz=None, ky=1.0, kz=1.0, ny=None, nz=None, my=None, mz=None, nsiy=None, nsiz=None, nsiyz=None, cw=None, stress='GRID', w=None, wy=None, wz=None, comment='')[source]¶ Bases:
pyNastran.bdf.cards.properties.bars.LineProperty1 2 3 4 5 6 7 8 9 PBEAM3 PID MID A(A) IZ(A) IY(A) IYZ(A) J(A) NSM(A) CY(A) CZ(A) DY(A) DZ(A) EY(A) EZ(A) FY(A) FZ(A) SO(B) A(B) IZ(B) IY(B) IYZ(B) J(B) NSM(B) CY(B) CZ(B) DY(B) DZ(B) EY(B) EZ(B) FY(B) FZ(B) SO(C) A(C) IZ(C) IY(C) IYZ(C) J(C) NSM(C) CY(C) CZ(C) DY(C) DZ(C) EY(C) EZ(C) FY(C) FZ(C) KY KZ NY(A) NZ(A) NY(B) NZ(B) NY(C) NZ(C) MY(A) MZ(A) MY(B) MZ(B) MY(C) MZ(C) NSIY(A) NSIZ(A) NSIYZ(A) NSIY(B) NSIZ(B) NSIYZ(B) NSIY(C) NSIZ(C) NSIYZ(C) CW(A) CW(B) CW(C) STRESS WC(A) WYC(A) WZC(A) WD(A) WYD(A) WZD(A) WE(A) WYE(A) WZE(A) WF(A) WYF(A) WZF(A) WC(B) WYC(B) WZC(B) WD(B) WYD(B) WZD(B) WE(B) WYE(B) WZE(B) WF(B) WYF(B) WZF(B) WC(C) WYC(C) WZC(C) WD(C) WYD(C) WZD(C) WE(C) WYE(C) WZE(C) WF(C) WYF(C) WZF(C) Creates a PBEAM3 card
Parameters: - pid : int
property id
- mid : int
material id
- A : List[float]
areas for ABC
- iz / iy / iyz : List[float]
area moment of inertias for ABC
- iyz : List[float]; default=None -> [0., 0., 0.]
area moment of inertias for ABC
- j : List[float]; default=None
polar moment of inertias for ABC None -> iy + iz from section A for ABC
- so : List[str]; default=None
None -> [‘YES’, ‘YESA’, ‘YESA’]
- cy / cz / dy / dz / ey / ez / fy / fz : List[float]; default=[0., 0., 0.]
stress recovery loctions for ABC
- ny / nz : List[float]
Local (y, z) coordinates of neutral axis for ABC
- my / mz : List[float]
Local (y, z) coordinates of nonstructural mass center of gravity for ABC
- nsiy / nsiz / nsiyz : List[float]
Nonstructural mass moments of inertia per unit length about local y and z-axes, respectively, with regard to the nonstructural mass center of gravity for ABC
- cw : List[float]
warping coefficients for ABC
- stress : str; default=’GRID’
Location selection for stress, strain and force output.
- w : (4, 3) float numpy array; default=None
Values of warping function at stress recovery points None : array of 0.0
- wy / wz : (4, 3) float numpy array; default=None
Gradients of warping function in the local (y, z) coordinate system at stress recovery points None : array of 0.0
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Nsm(self)[source]¶ Gets the non-structural mass \(nsm\). .. warning:: nsm field not supported fully on PBEAM3 card
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classmethod
add_card(card, comment='')[source]¶ Adds a PBARL card from
BDF.add_card(...)Parameters: - card : BDFCard()
a BDFCard object
- comment : str; default=’‘
a comment for the card
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cross_reference(self, model)[source]¶ Cross links the card so referenced cards can be extracted directly
Parameters: - model : BDF()
the BDF object
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type= 'PBEAM3'¶
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class
pyNastran.bdf.cards.properties.bars.PBEND(pid, mid, beam_type, A, i1, i2, j, c1, c2, d1, d2, e1, e2, f1, f2, k1, k2, nsm, rc, zc, delta_n, fsi, rm, t, p, rb, theta_b, comment='')[source]¶ Bases:
pyNastran.bdf.cards.properties.bars.LinePropertyMSC/NX Option A
1 2 3 4 5 6 7 7 8 PBEND PID MID A I1 I2 J RB THETAB C1 C2 D1 D2 E1 E2 F1 F2 K1 K2 NSM RC ZC DELTAN MSC Option B
1 2 3 4 5 6 7 7 8 PBEND PID MID FSI RM T P RB THETAB NSM RC ZC NX Option B
1 2 3 4 5 6 7 7 8 PBEND PID MID FSI RM T P RB THETAB SACL ALPHA NSM RC ZC FLANGE KX KY KZ SY SZ -
classmethod
add_beam_type_1(pid, mid, A, i1, i2, j, rb=None, theta_b=None, c1=0.0, c2=0.0, d1=0.0, d2=0.0, e1=0.0, e2=0.0, f1=0.0, f2=0.0, k1=None, k2=None, nsm=0.0, rc=0.0, zc=0.0, delta_n=0.0, comment='')[source]¶ 1 2 3 4 5 6 7 7 8 PBEND PID MID A I1 I2 J RB THETAB C1 C2 D1 D2 E1 E2 F1 F2 K1 K2 NSM RC ZC DELTAN Parameters: - A : float
cross-sectional area
- i1, i2 : float
area moments of inertia for plane 1/2
- j : float
torsional stiffness
- rb : float; default=None
bend radius of the line of centroids
- theta_b : float; default=None
arc angle of element (degrees)
- c1, c2, d1, d2, e1, e2, f1, f2 : float; default=0.0
the r/z locations from the geometric centroid for stress recovery
- k1, k2 : float; default=None
Shear stiffness factor K in K*A*G for plane 1 and plane 2
- nsm : float; default=0.
nonstructural mass per unit length???
- zc : float; default=None
Offset of the geometric centroid in a direction perpendicular to the plane of points GA and GB and vector v.
- delta_n : float; default=None
Radial offset of the neutral axis from the geometric centroid, positive is toward the center of curvature
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classmethod
add_beam_type_2(pid, mid, fsi, rm, t, p=None, rb=None, theta_b=None, nsm=0.0, rc=0.0, zc=0.0, comment='')[source]¶ 1 2 3 4 5 6 7 7 8 PBEND PID MID FSI RM T P RB THETAB NSM RC ZC Parameters: - fsi : int
Flag selecting the flexibility and stress intensification factors. See Remark 3. (Integer = 1, 2, or 3)
- rm : float
Mean cross-sectional radius of the curved pipe
- t : float
Wall thickness of the curved pipe
- p : float; default=None
Internal pressure
- rb : float; default=None
bend radius of the line of centroids
- theta_b : float; default=None
arc angle of element (degrees)
- nsm : float; default=0.
nonstructural mass per unit length???
- rc : float; default=None
Radial offset of the geometric centroid from points GA and GB.
- zc : float; default=None
Offset of the geometric centroid in a direction perpendicular to the plane of points GA and GB and vector v
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classmethod
add_card(card, comment='')[source]¶ Adds a PBEND card from
BDF.add_card(...)Parameters: - card : BDFCard()
a BDFCard object
- comment : str; default=’‘
a comment for the card
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cross_reference(self, model)[source]¶ Cross links the card so referenced cards can be extracted directly
Parameters: - model : BDF()
the BDF object
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repr_fields(self)[source]¶ Gets the fields in their simplified form
Returns: - fields : List[varies]
the fields that define the card
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type= 'PBEND'¶
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classmethod
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class
pyNastran.bdf.cards.properties.bars.PBRSECT(pid, mid, form, options, comment='')[source]¶ Bases:
pyNastran.bdf.cards.properties.bars.LinePropertynot done
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MassPerLength(self)[source]¶ Gets the mass per length \(\frac{m}{L}\) of the CBAR.
\[\frac{m}{L} = A \rho + nsm\]
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classmethod
add_card(card, comment='')[source]¶ Adds a PBRSECT card from
BDF.add_card(...)Parameters: - card : List[str]
this card is special and is not a
BDFCardlike other cards- comment : str; default=’‘
a comment for the card
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cross_reference(self, model)[source]¶ Cross links the card so referenced cards can be extracted directly
Parameters: - model : BDF()
the BDF object
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mid= None¶ Material ID
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pid= None¶ Property ID
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plot(self, model, figure_id=1, show=False)[source]¶ Plots the beam section
Parameters: - model : BDF()
the BDF object
- figure_id : int; default=1
the figure id
- show : bool; default=False
show the figure when done
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type= 'PBRSECT'¶
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pyNastran.bdf.cards.properties.bars._bar_areaL(x) method for the PBARL and PBEAML classes (pronounced **Area-L**)[source]¶ Area(x) method for the PBARL and PBEAML classes (pronounced Area-L)
Parameters: - dim : List[float]
a list of the dimensions associated with beam_type
Returns: - Area : float
Area of the given cross section defined by self.beam_type
Notes
internal method
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pyNastran.bdf.cards.properties.bars.get_beam_sections(line)[source]¶ Splits a PBRSECT/PBMSECT line
>>> line = 'OUTP=10,BRP=20,T=1.0,T(11)=[1.2,PT=(123,204)], NSM=0.01' >>> sections = get_beam_sections(line) >>> sections ['OUTP=10', 'BRP=20', 'T=1.0', 'T(11)=[1.2,PT=(123,204)', 'NSM=0.01'], sections
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pyNastran.bdf.cards.properties.bars.get_inertia_rectangular(sections)[source]¶ Calculates the moment of inertia for a section about the CG.
Parameters: - sections : [[b,h,y,z]_1,…]
[[b,h,y,z]_1,…] y,z is the centroid (x in the direction of the beam, y right, z up)
Returns: - interia_parameters : List[Area, Iyy, Izz, Iyz]
the inertia parameters
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pyNastran.bdf.cards.properties.bars.plot_arbitrary_section(model, self, inps, ts, branch_paths, nsm, outp_ref, figure_id=1, title='', show=False)[source]¶ helper for PBRSECT/PBMSECT
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pyNastran.bdf.cards.properties.bars.split_arbitrary_thickness_section(key, value)[source]¶ Helper method for PBRSECT/PBMSECT
>>> key = 'T(11)' >>> value = '[1.2,PT=(123,204)]' >>> index, out = split_arbitrary_thickness_section(key, value) >>> index 11 >>> out [1.2, [123, 204]]