Composite failure analysis

This example shows how to analyze a composite structure by a combined failure criterion.

The failure operator of DPF Composites computes the minimum and maximum failure values and failure modes of a combined failure criterion. A combined failure criterion is a selection of failure criteria such as Puck, Tsai-Wu, or face sheet wrinkling. For a list of all failure criteria, see Failure criteria.

The Combined Failure Criterion class allows you to assess different type of materials and failure modes at once. The scoping enables you to evaluate the minimum and maximum failures per element or select a list of materials or plies.

Set up analysis

Setting up the analysis consists of loading Ansys libraries, connecting to the DPF server, and retrieving the example files.

Load Ansys libraries.

from ansys.dpf.composites.composite_model import CompositeModel, CompositeScope
from ansys.dpf.composites.constants import FailureOutput
from ansys.dpf.composites.example_helper import get_continuous_fiber_example_files
from ansys.dpf.composites.failure_criteria import (
    CombinedFailureCriterion,
    CoreFailureCriterion,
    MaxStrainCriterion,
    MaxStressCriterion,
    VonMisesCriterion,
)
from ansys.dpf.composites.server_helpers import connect_to_or_start_server

Start a DPF server and copy the example files into the current working directory.

server = connect_to_or_start_server()
composite_files_on_server = get_continuous_fiber_example_files(server, "shell")

Configure combined failure criterion

Configure the combined failure criterion.

combined_fc = CombinedFailureCriterion(
    name="failure of all materials",
    failure_criteria=[
        MaxStrainCriterion(),
        MaxStressCriterion(),
        CoreFailureCriterion(),
        VonMisesCriterion(vme=True, vms=False),
    ],
)

Set up model and evaluate failures

Set up the composite model.

composite_model = CompositeModel(composite_files_on_server, server)

Evaluate failures for the entire model

output_all_elements = composite_model.evaluate_failure_criteria(
    combined_criterion=combined_fc,
)
irf_field = output_all_elements.get_field({"failure_label": FailureOutput.FAILURE_VALUE})
irf_field.plot()

Scope failure evaluation to a certain element scope.

output_two_elements = composite_model.evaluate_failure_criteria(
    combined_criterion=combined_fc,
    composite_scope=CompositeScope(elements=[1, 3]),
)
irf_field = output_two_elements.get_field({"failure_label": FailureOutput.FAILURE_VALUE})
irf_field.plot()

Scope failure evaluation by plies.

output_woven_plies = composite_model.evaluate_failure_criteria(
    combined_criterion=combined_fc,
    composite_scope=CompositeScope(plies=["P1L1__ud_patch ns1"]),
)
irf_field = output_woven_plies.get_field({"failure_label": FailureOutput.FAILURE_VALUE})
irf_field.plot()