def __init__(self,
material=None,
fes=None,
integration_rule=None,
material_csys=CSys(),
assoc_geom=None):
"""Constructor.
:param material: Material object.
:param fes: Finite element set object.
:param integration_rule: Integration rule object.
"""
super().__init__(fes=fes,
integration_rule=integration_rule,
material_csys=material_csys,
assoc_geom=assoc_geom)
self.material = material
self._phis = None
e = getattr(self.material, 'e', None)
if e is not None:
e = self.material.e
if self.material.nu < 0.3:
nu = self.material.nu
else:
nu = 0.3 + (self.material.nu - 0.3) / 2.0
else:
e1 = getattr(self.material, 'e1', None)
if e1 is not None:
e = min(self.material.e1, self.material.e2, self.material.e3)
nu = min(self.material.nu12, self.material.nu13,
self.material.nu23)
else:
raise Exception(
'No clues on how to construct the stabilization material')
self.stabilization_material = MatDeforTriaxLinearIso(e=e, nu=nu)
# Now try to figure out which Poisson ratio to use in the optimal scaling
# factor(to account for geometry)
nu = getattr(self.material, "nu", None)
if nu is not None:
self.nu = self.material.nu
else:
nu12 = getattr(self.material, "nu12", None)
if nu12 is not None:
self.nu = max(self.material.nu12, self.material.nu13,
self.material.nu23)
else:
raise Exception(
'No clues on how to construct the stabilization material')
from scipy.sparse.csgraph import reverse_cuthill_mckee
import spyfe.bipwr
import time
from spyfe.meshing.exporters.vtkexporter import vtkexport
start0 = time.time()
E = 200e9
nu = 0.3
rho = 8000
a = 10.0
b = a
h = 0.05
htol = h / 1000
na, nb, nh = 6,6,4
m = MatDeforTriaxLinearIso(rho=rho, e=E, nu=nu)
start = time.time()
fens, fes = h8_block(a, b, h, na, nb, nh)
fens, fes = h8_to_h20(fens, fes)
print('Mesh generation', time.time() - start)
geom = NodalField(fens=fens)
u = NodalField(nfens=fens.count(), dim=3)
cn = fenode_select(fens, box=numpy.array([0, 0, 0, b, 0, h]), inflate=htol)
for j in cn:
u.set_ebc([j], comp=0, val=0.0)
u.set_ebc([j], comp=1, val=0.0)
u.set_ebc([j], comp=2, val=0.0)
u.apply_ebc()
femmk = FEMMDeforLinear(material=m, fes=fes, integration_rule=GaussRule(dim=3, order=2))
femmk.associate_geometry(geom)
import time
start0 = time.time()
E = 1000
nu = 0.4999
W = 2.5
H = 5
L = 50
# nW, nL, nH = 20, 20, 20
nW, nL, nH = 4, 20, 4
htol = min(L, H, W) / 1000
magn = -0.2 * 12.2334 / 4
Force = magn * W * H * 2
Force * L**3 / (3 * E * W * H**3 * 2 / 12)
uzex = -12.0935378981478
m = MatDeforTriaxLinearIso(e=E, nu=nu)
start = time.time()
fens, fes = t4_block(W, L, H, nW, nL, nH, orientation='ca')
fens, fes = t4_to_t10(fens, fes)
print('Mesh generation', time.time() - start)
model_data = {}
model_data['fens'] = fens
model_data['regions'] = [{'femm': FEMMDeforLinearQT10MS(material=m, fes=fes)}]
algo_common.plot_mesh(model_data)
model_data['boundary_conditions'] = {}
# Clamped face
cn = fenode_select(fens, box=numpy.array([0, W, 0, 0, 0, H]), inflate=htol)
class FEMMDeforLinearMS(FEMMDeforLinear):
"""
Class for small-strain linear deformation based on the mean-strain
technology with stabilization by full quadrature (energy-sampling stabilization).
"""
def __init__(self,
material=None,
fes=None,
integration_rule=None,
material_csys=CSys(),
assoc_geom=None):
"""Constructor.
:param material: Material object.
:param fes: Finite element set object.
:param integration_rule: Integration rule object.
"""
super().__init__(fes=fes,
integration_rule=integration_rule,
material_csys=material_csys,
assoc_geom=assoc_geom)
self.material = material
self._phis = None
e = getattr(self.material, 'e', None)
if e is not None:
e = self.material.e
if self.material.nu < 0.3:
nu = self.material.nu
else:
nu = 0.3 + (self.material.nu - 0.3) / 2.0
else:
e1 = getattr(self.material, 'e1', None)
if e1 is not None:
e = min(self.material.e1, self.material.e2, self.material.e3)
nu = min(self.material.nu12, self.material.nu13,
self.material.nu23)
else:
raise Exception(
'No clues on how to construct the stabilization material')
self.stabilization_material = MatDeforTriaxLinearIso(e=e, nu=nu)
# Now try to figure out which Poisson ratio to use in the optimal scaling
# factor(to account for geometry)
nu = getattr(self.material, "nu", None)
if nu is not None:
self.nu = self.material.nu
else:
nu12 = getattr(self.material, "nu12", None)
if nu12 is not None:
self.nu = max(self.material.nu12, self.material.nu13,
self.material.nu23)
else:
raise Exception(
'No clues on how to construct the stabilization material')
def associate_geometry(self, geom):
"""Associate geometry.
This method needs to be called before any computation with the FEMM is performed.
It calculates the stabilization factors dependent on the geometry.
:param geom: Geometry field.
:return: Nothing. The object is modified.
"""
raise Exception('Needs to be overridden')
def stiffness(self, geom, u):
fes = self.fes
bfuns, gradbfunpars, npts, pc, w = self.integration_data()
mcs = self.material_csys
md = self.material.modulidata() # material stiffness in material CS
d = numpy.zeros_like(md) # material stiffness in global CS
dstab = numpy.zeros_like(d)
transfd = numpy.zeros_like(d)
self.material.stress_vector_rotation_matrix(transfd,
None) #generate identity
if mcs.isconstant and not mcs.isidentity:
mcsmtx = mcs.eval_matrix() # constant
self.material.stress_vector_rotation_matrix(transfd, mcsmtx.T)
d_constant = self.material.moduli_are_constant()
if d_constant:
self.material.tangent_moduli(md)
self.stabilization_material.tangent_moduli(
dstab
) # the stabilization material assumed to have constant moduli
bmatfun, b = self.fes.bmatdata(self.fes.nfens)
bbar = copy.copy(b)
assm = SysmatAssemblerSparseFixedSymm(fes, u)
gradbfun = list()
jac = list()
gradbfunmean = numpy.zeros((fes.nfens, geom.dim))
for j in range(npts):
gradbfun.append(numpy.zeros((fes.nfens, geom.dim)))
jac.append(0.0)
for i in range(fes.conn.shape[0]):
x = geom.values[fes.conn[i, :], :]
# Calculate mean basis function gradient + volume of the element
vol = 0
gradbfunmean.fill(0.0)
for j in range(npts):
jacmat = dot(x.T, gradbfunpars[j])
jac[j] = fes.jac_volume(fes.conn[i, :], bfuns[j], jacmat, x)
fes.gradbfun(gradbfun[j], gradbfunpars[j], jacmat)
dvol = (jac[j] * w[j])
gradbfunmean += gradbfun[j] * dvol
vol = vol + dvol
gradbfunmean /= vol
bmatfun(bbar, None, gradbfunmean,
None) # strain-displacement matrix in global CS
if not d_constant:
self.material.tangent_moduli(md)
numpy.copyto(d, md) # moduli in material CS
if not mcs.isidentity: # Transformation is required
if not mcs.isconstant: # Do I need to evaluate the local mat orient?
mcsmtx = mcs.eval_matrix(c, jacmat, fes.label[i])
self.material.stress_vector_rotation_matrix(
transfd, mcsmtx.T)
self.material.rotate_stiffness(d,
transfd) # moduli in global CS
# These matrices are in the global Cartesian coordinate system
assm.elmtx[i, :, :] = dot(
bbar.T, dot(vol * (d - self._phis[i] * dstab), bbar))
for j in range(npts):
bmatfun(b, None, gradbfun[j],
None) # strain-displacement matrix in global CS
assm.elmtx[i, :, :] += dot(
b.T, dot((self._phis[i] * jac[j] * w[j]) * dstab, b))
return assm.make_matrix()
def nz_ebc_loads(self, geom, u):
fes = self.fes
bfuns, gradbfunpars, npts, pc, w = self.integration_data()
mcs = self.material_csys
md = self.material.modulidata() # material stiffness in material CS
d = numpy.zeros_like(md) # material stiffness in global CS
dstab = numpy.zeros_like(d)
transfd = numpy.zeros_like(d)
self.material.stress_vector_rotation_matrix(transfd,
None) # generate identity
if mcs.isconstant and not mcs.isidentity:
mcsmtx = mcs.eval_matrix() # constant
self.material.stress_vector_rotation_matrix(transfd, mcsmtx.T)
d_constant = self.material.moduli_are_constant()
if d_constant:
self.material.tangent_moduli(md)
self.stabilization_material.tangent_moduli(
dstab
) # the stabilization material assumed to have constant moduli
pu = numpy.zeros((self.fes.conn.shape[1] * u.dim, ),
dtype=numpy.float64)
bmatfun, b = self.fes.bmatdata(self.fes.nfens)
bbar = copy.copy(b)
assm = SysvecAssembler(fes, u)
gradbfun = list()
jac = list()
gradbfunmean = numpy.zeros((fes.nfens, geom.dim))
for j in range(npts):
gradbfun.append(numpy.zeros((fes.nfens, geom.dim)))
jac.append(0.0)
for i in range(fes.conn.shape[0]):
x = geom.values[fes.conn[i, :], :]
u.gather_fixed_values_vec(fes.conn[i, :], pu)
if any(pu != 0.0):
# Calculate mean basis function gradient + volume of the element
vol = 0
gradbfunmean.fill(0.0)
for j in range(npts):
jacmat = dot(x.T, gradbfunpars[j])
jac[j] = fes.jac_volume(fes.conn[i, :], bfuns[j], jacmat,
x)
fes.gradbfun(gradbfun[j], gradbfunpars[j], jacmat)
dvol = (jac[j] * w[j])
gradbfunmean += gradbfun[j] * dvol
vol = vol + dvol
gradbfunmean /= vol
bmatfun(bbar, None, gradbfunmean,
None) # strain-displacement matrix in global CS
if not d_constant:
self.material.tangent_moduli(md)
numpy.copyto(d, md) # moduli in material CS
if not mcs.isidentity: # Transformation is required
if not mcs.isconstant: # Do I need to evaluate the local mat orient?
mcsmtx = mcs.eval_matrix(c, jacmat, fes.label[i])
self.material.stress_vector_rotation_matrix(
transfd, mcsmtx.T)
self.material.rotate_stiffness(
d, transfd) # moduli in global CS
# These matrices are in the global Cartesian coordinate system
ke = dot(bbar.T, dot(vol * (d - self._phis[i] * dstab), bbar))
for j in range(npts):
bmatfun(b, None, gradbfun[j],
None) # strain-displacement matrix in global CS
ke += dot(b.T,
dot((self._phis[i] * jac[j] * w[j]) * dstab, b))
assm.elvec[i, :] = dot(ke, pu).ravel()
return assm.make_vector()
def inspect_integration_points(self,
fe_list,
inspector,
idat,
geom,
un1,
un,
dt=0.0,
dtempn1=None,
outcs=CSys(),
output=OUTPUT_CAUCHY):
"""Inspect integration point quantities.
:param fe_list: indexes of the finite elements that are to be inspected:
The fes to be included are: fes.conn[fe_list, :].
:param inspector: inspector function,
:param idat: data for inspector function,
:param geom: Geometry field.
:param un1: Displacement field at the time t_n+1.
:param un: Displacement field at time t_n.
:param dt: Time step from t_n to t_n+1.
:param dtempn1: Temperature increment field or None.
:return: idat: data for inspector function
"""
fes = self.fes
bfuns, gradbfunpars, npts, pc, w = self.integration_data()
mcs = self.material_csys
if mcs.isconstant:
mcsmtx = mcs.eval_matrix() # constant
if outcs is not None and outcs.isconstant:
outcsmtx = outcs.eval_matrix() # constant
if dtempn1 is None:
dtemps = numpy.zeros((geom.nfens, 1))
else:
dtemps = dtempn1.values
bmatfun, bbar = self.fes.bmatdata(self.fes.nfens)
elemu = numpy.zeros((fes.nfens * un1.dim, ))
gradbfun = list()
jac = list()
gradbfunmean = numpy.zeros((fes.nfens, geom.dim))
for j in range(npts):
gradbfun.append(numpy.zeros((fes.nfens, geom.dim)))
jac.append(0.0)
quantityout = None
vout = None
for i in fe_list:
x = geom.values[fes.conn[i, :], :]
# Calculate mean basis function gradient + volume of the element
vol = 0
gradbfunmean.fill(0.0)
for j in range(npts):
jacmat = dot(x.T, gradbfunpars[j])
jac[j] = fes.jac_volume(fes.conn[i, :], bfuns[j], jacmat, x)
fes.gradbfun(gradbfun[j], gradbfunpars[j], jacmat)
dvol = jac[j] * w[j]
gradbfunmean += gradbfun[j] * dvol
vol = vol + dvol
gradbfunmean /= vol
bmatfun(bbar, None, gradbfunmean, None)
un1.gather_values_vec(fes.conn[i, :], elemu)
c = dot(bfuns[j].T, x) # Model location of the quadrature point
u_c = dot(bfuns[j].T, un1.values[fes.conn[
i, :], :]) # Displacement of the quad point
strain = dot(bbar,
elemu) # strain in global Cartesian coordinate system
mstrain = numpy.copy(strain) #strain in material coordinate
# If necessary, transform the strain from the global CS to the material CS
if not mcs.isidentity: # Transformation is required
if not mcs.isconstant: # Do I need to evaluate the local mat orient?
mcsmtx = mcs.eval_matrix(c, jacmat, fes.label[i])
self.material.rotate_strain_vector(mstrain, mcsmtx, strain)
dtemp = dot(bfuns[j].T, dtemps[fes.conn[i, :]])
quantityout = self.material.state(None,
strain=strain,
dtemp=dtemp,
output=output,
quantityout=quantityout)
if output == OUTPUT_CAUCHY: # vector quantity: transformation may be required
if vout is None:
vout = numpy.zeros_like(quantityout)
if not mcs.isidentity: # Transformation is required
self.material.rotate_stress_vector(vout, mcsmtx.T,
quantityout)
quantityout[:] = vout[:]
if not outcs.isidentity: # Transformation is required
if not outcs.isconstant: # Do I need to evaluate the local mat orient?
outcsmtx = outcs.eval_matrix(c, jacmat, fes.label[i])
self.material.rotate_stress_vector(vout, outcsmtx,
quantityout)
quantityout[:] = vout[:]
else: #
pass
if inspector is not None:
inspector(idat, quantityout, c, u_c, pc[j, :])
return idat
from scipy.sparse.csgraph import reverse_cuthill_mckee
import time
from spyfe.meshing.exporters.vtkexporter import vtkexport
from spyfe.meshing.importers import abaqus_importer
from spyfe.materials.mat_defor import OUTPUT_CAUCHY
import scipy.io
start0 = time.time()
# Reference value is the axial stress at point A (at the spherical part, plane of symmetry, interior)
sigma_z_A_ref = -105e6
E = 210e9
nu = 0.3
alpha = 2.3e-4
m = MatDeforTriaxLinearIso(e=E, nu=nu, alpha=alpha)
start = time.time()
fens, feslist = abaqus_importer.import_mesh('LE11_H20_90deg.inp')
# Account for the instance rotation
fens = rotate_mesh(fens, math.pi * 90. / 180 * numpy.array([1.0, 0.0, 0.0]),
numpy.array([0.0, 0.0, 0.0]))
for fes in feslist:
print(fes.count())
fes = feslist[0]
scipy.io.savemat('LE11_H20_90deg.mat', {'xyz': fens.xyz, 'conn': fes.conn})
print('Mesh import', time.time() - start)
geom = NodalField(fens=fens)
u = NodalField(nfens=fens.count(), dim=3)
htol = 1.0 / 1000
