Rosette example

This example illustrates how you can use rosettes to define the reference directions of a ply. It only shows the PyACP part of the setup. For a complete composite analysis, see Basic PyACP workflow example.

Import modules

Import the standard library and third-party dependencies.

import pathlib
import tempfile

import numpy as np

Import the PyACP dependencies.

from ansys.acp.core import (
    ACPWorkflow,
    EdgeSetType,
    PlyType,
    RosetteSelectionMethod,
    RosetteType,
    get_directions_plotter,
    launch_acp,
)
from ansys.acp.core.example_helpers import ExampleKeys, get_example_file

Start ACP and load the model

Get the example file from the server.

tempdir = tempfile.TemporaryDirectory()
WORKING_DIR = pathlib.Path(tempdir.name)
input_file = get_example_file(ExampleKeys.BASIC_FLAT_PLATE_DAT, WORKING_DIR)

Launch the PyACP server and connect to it.

acp = launch_acp()

Define the input file and instantiate an ACPWorkflow instance. The ACPWorkflow class provides convenience methods that simplify file handling. It automatically creates a model based on the input file. This example’s input file contains a flat plate with a single ply.

workflow = ACPWorkflow.from_cdb_or_dat_file(
    acp=acp,
    cdb_or_dat_file_path=input_file,
    local_working_directory=WORKING_DIR,
)

model = workflow.model
print(workflow.working_directory.path)
print(model.unit_system)

/tmp/tmpml1eh28y
mks

Define directions with a parallel rosette

Create a material and fabric.

ud_material = model.create_material(
    name="UD",
    ply_type=PlyType.REGULAR,
)

fabric = model.create_fabric(name="UD", material=ud_material, thickness=0.1)

Create a parallel rosette where the first direction is rotated by 45 degrees around the y axis.

parallel_rosette_45_deg = model.create_rosette(
    name="ParallelRosette",
    rosette_type=RosetteType.PARALLEL,
    origin=(0, 0, 0),
    dir1=(np.sqrt(2) / 2, 0, np.sqrt(2) / 2),
    dir2=(-np.sqrt(2) / 2, 0, np.sqrt(2) / 2),
)

Create an oriented selection set (OSS) and assign the rosette.

oss = model.create_oriented_selection_set(
    name="oss",
    orientation_point=(0.0, 0.0, 0.0),
    orientation_direction=(0.0, 1.0, 0),
    element_sets=[model.element_sets["All_Elements"]],
    rosettes=[parallel_rosette_45_deg],
)

model.update()

Plot the orientation and reference directions of the OSS.

plotter = get_directions_plotter(
    model=model, components=[oss.elemental_data.orientation, oss.elemental_data.reference_direction]
)
plotter.show()

Static Scene

Interactive Scene

Create a ply that uses the reference directions defined by the rosette. The ply angle is set to 20 degrees, which means that the fiber direction is rotated by 20 degrees from the reference direction.

modeling_group = model.create_modeling_group(name="modeling_group")
modeling_ply = modeling_group.create_modeling_ply(
    name="ply",
    ply_angle=20,
    ply_material=fabric,
    oriented_selection_sets=[oss],
)

Plot the reference directions, fiber directions, and transverse directions of the ply.

plotter = get_directions_plotter(
    model=model,
    components=[
        modeling_ply.elemental_data.reference_direction,
        modeling_ply.elemental_data.fiber_direction,
        modeling_ply.elemental_data.transverse_direction,
    ],
)
plotter.show()

Static Scene

Interactive Scene

Define directions with a radial rosette

Create a radial rosette and plot the resulting reference directions. For a radial rosette, a line is constructed that goes through the origin. Its direction vector is normal to a plane spanned by dir1 and dir2. Therefore, the reference directions are parallel to the shortest connection from the line to each point for which it is computed.

radial_rosette = model.create_rosette(
    name="RadialRosette",
    rosette_type=RosetteType.RADIAL,
    origin=(0.005, 0, 0.005),
    dir1=(1, 0, 0),
    dir2=(0, 0, 1),
)

oss.rosettes = [radial_rosette]
model.update()

plotter = get_directions_plotter(model=model, components=[oss.elemental_data.reference_direction])
plotter.show()

Static Scene

Interactive Scene

Define directions with a cylindrical rosette

Create a cylindrical rosette and plot the resulting reference directions. For a cylindrical rosette, the reference directions are tangential to the circles around the origin that lie in a plane spanned by dir1 and dir2.

cylindrical_rosette = model.create_rosette(
    name="CylindricalRosette",
    rosette_type=RosetteType.CYLINDRICAL,
    origin=(0.005, 0, 0.005),
    dir1=(1, 0, 0),
    dir2=(0, 0, 1),
)

oss.rosettes = [cylindrical_rosette]
model.update()

plotter = get_directions_plotter(model=model, components=[oss.elemental_data.reference_direction])
plotter.show()

Static Scene

Interactive Scene

Define directions with a spherical rosette

Create a spherical rosette and plot the resulting reference directions. For a spherical rosette, the reference directions are tangential to a sphere around the origin. Note that for this example, the reference directions of the spherical rosette are the same as those of the cylindrical rosette.

spherical_rosette = model.create_rosette(
    name="SphericalRosette",
    rosette_type=RosetteType.SPHERICAL,
    origin=(0.005, 0, 0.005),
    dir1=(1, 0, 0),
    dir2=(0, 0, 1),
)

oss.rosettes = [spherical_rosette]
model.update()

plotter = get_directions_plotter(model=model, components=[oss.elemental_data.reference_direction])
plotter.show()

Static Scene

Interactive Scene

Define directions with an edge-wise rosette

Create an edge-wise rosette and plot the resulting reference directions. The reference directions are given by a projection of dir1 and the path of the edge set. dir1 of the rosette is projected onto the point on the edge that is closest to the rosette’s origin. This determines the reference directions along the edge set. You can reverse the reference directions by inverting dir1. An element within an OSS gets its reference directions from the direction of the point on the edge that is closest to the element centroid.

Create the edge set from the “All_Elements” element set. Because you assigned 120 degrees to the limit angle, all the edges are selected.

edge_set = model.create_edge_set(
    name="edge_set",
    edge_set_type=EdgeSetType.BY_REFERENCE,
    limit_angle=120,
    element_set=model.element_sets["All_Elements"],
    origin=(0, 0, 0),
)

edge_wise_rosette = model.create_rosette(
    name="EdgeWiseRosette",
    rosette_type=RosetteType.EDGE_WISE,
    edge_set=edge_set,
    origin=(0.005, 0, 0.005),
    dir1=(1, 0, 0),
    dir2=(0, 0, 1),
)

oss.rosettes = [edge_wise_rosette]
model.update()

plotter = get_directions_plotter(model=model, components=[oss.elemental_data.reference_direction])
plotter.show()

Static Scene

Interactive Scene

Combine rosettes

Create an additional parallel rosette that points along the x direction and has its origin at (0.01, 0, 0.01).

parallel_rosette_0_deg = model.create_rosette(
    name="ParallelRosette",
    rosette_type=RosetteType.PARALLEL,
    origin=(0.01, 0, 0.01),
    dir1=(1, 0, 0),
    dir2=(0, 0, 1),
)

Assign both rosettes to the OSS and set the rosette selection method to RosetteSelectionMethod.MINIMUM_DISTANCE_SUPERPOSED. This implies that the reference directions are weighted by the inverse distance to each rosette. Note that the origin of the rotated rosette is at (0,0,0).

oss.rosettes = [parallel_rosette_45_deg, parallel_rosette_0_deg]
oss.rosette_selection_method = RosetteSelectionMethod.MINIMUM_DISTANCE_SUPERPOSED

Plot the resulting reference directions.

model.update()
plotter = get_directions_plotter(model=model, components=[oss.elemental_data.reference_direction])
plotter.show()

Static Scene

Interactive Scene