.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "examples\04-advanced\10-asme_secviii_divtwo.py" .. LINE NUMBERS ARE GIVEN BELOW. .. only:: html .. note:: :class: sphx-glr-download-link-note :ref:`Go to the end ` to download the full example code. .. rst-class:: sphx-glr-example-title .. _sphx_glr_examples_04-advanced_10-asme_secviii_divtwo.py: .. _ref_ASME_SecVIII_Div2: Pressure vessel analysis according to an ASME standard ------------------------------------------------------ This example demonstrates how you can use PyDPF to postprocess a Mechanical model according to the ASME Section VIII Division 2 standard for pressure vessel designs. This example is taken from Workshop 02.1 from Ansys Mechanical Advanced Topics. Instead of using several user defined results as it is done in the workshop, DPF is able to calculate the triaxial strain limit and compare it with the equivalent plastic strain, as specified in Equation 5.7 assuming 0 forming strain. Please be aware that this is just an example, so it is the user's duty to verify that calculation is made according to latest ASME standard. .. GENERATED FROM PYTHON SOURCE LINES 41-58 .. code-block:: Python # Import the result file from Workshop 02.1. # Because it is a elastic-plastic analysis, there are several substeps. The focus # here is on the latest substep (number 4) import ansys.dpf.core as dpf from ansys.dpf.core import examples path = examples.download_example_asme_result() model = dpf.Model(path) data_source = model.metadata.data_sources time_scoping = dpf.Scoping() time_scoping.location = dpf.locations.time_freq time_scoping.ids = [4] .. GENERATED FROM PYTHON SOURCE LINES 59-73 Parameters input ~~~~~~~~~~~~~~~~ You must go to ASME Section III Division 2 to get values for the parameters ``alfasl`` and ``m2``. This is the code for introducing these parameters manually: - ``alfasl`` = input("Introduce ``alfasl`` parameter from ASME\n") - ``alfasl`` = float(alfasl) - ``m2`` = input("Introduce ``m2`` parameter from ASME\n") - ``m2`` = float(m2) For this exercise, ``alfasl`` = 2.2 and ``m2`` = .288, which is the same as the original. .. GENERATED FROM PYTHON SOURCE LINES 73-77 .. code-block:: Python alfasl = 2.2 m2 = 0.288 .. GENERATED FROM PYTHON SOURCE LINES 78-84 Stresses and strains ~~~~~~~~~~~~~~~~~~~~ Stresses and strains are read. To get the same results as Mechanical, read elemental nodal strains and apply von Mises invariant. This operator does not have an option for defining the effective Poisson's ratio. Consequently, a correction factor is applied. .. GENERATED FROM PYTHON SOURCE LINES 84-125 .. code-block:: Python seqv_op = dpf.operators.result.stress_von_mises( time_scoping=time_scoping, data_sources=data_source, requested_location=dpf.locations.nodal ) seqv = seqv_op.outputs.fields_container() s1_op = dpf.operators.result.stress_principal_1( time_scoping=time_scoping, data_sources=data_source, requested_location=dpf.locations.nodal ) s1 = s1_op.outputs.fields_container() s2_op = dpf.operators.result.stress_principal_2( time_scoping=time_scoping, data_sources=data_source, requested_location=dpf.locations.nodal ) s2 = s2_op.outputs.fields_container() s3_op = dpf.operators.result.stress_principal_3( time_scoping=time_scoping, data_sources=data_source, requested_location=dpf.locations.nodal ) s3 = s3_op.outputs.fields_container() strain_op = dpf.operators.result.plastic_strain( data_sources=data_source, requested_location=dpf.locations.elemental_nodal, time_scoping=time_scoping, ) pstrain = strain_op.outputs.fields_container() eppleqv_op = dpf.operators.invariant.von_mises_eqv_fc(fields_container=pstrain) eppleqv = eppleqv_op.outputs.fields_container() poisson_ratio_correction = 1.3 / 1.5 eppleqvmech_op = dpf.operators.math.scale_fc( fields_container=eppleqv, ponderation=poisson_ratio_correction ) eppleqvmech = eppleqvmech_op.outputs.fields_container() eppleqvave_op = dpf.operators.averaging.to_nodal_fc(fields_container=eppleqvmech) eppleqvave = eppleqvave_op.outputs.fields_container() .. GENERATED FROM PYTHON SOURCE LINES 126-128 Triaxial strain limit calculation ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. GENERATED FROM PYTHON SOURCE LINES 128-156 .. code-block:: Python # S12=S1+S2 s12_op = dpf.operators.math.add_fc(fields_container1=s1, fields_container2=s2) s12 = s12_op.outputs.fields_container() # S123=S12+S3 s123_op = dpf.operators.math.add_fc(fields_container1=s12, fields_container2=s3) s123 = s123_op.outputs.fields_container() # SVM_scale=SVM*3 ratio = 3.0 seqvs_op = dpf.operators.math.scale_fc(fields_container=seqv, ponderation=ratio) seqvs = seqvs_op.outputs.fields_container() # S123/SVM*3 sratio_op = dpf.operators.math.component_wise_divide(fieldA=s123, fieldB=seqvs) sratio = sratio_op.outputs.field() # S123/SVM*3-0.33 sterm_op = dpf.operators.math.add_constant(field=sratio, ponderation=-1 / 3) sterm = sterm_op.outputs.field() # -alfasl/(1+m2)*stressterm ratio2 = -alfasl / (1 + m2) expt_op = dpf.operators.math.scale(field=sterm, ponderation=ratio2) expt = expt_op.outputs.field() # exp(-alfasl/(1+m2)*stressterm) exp_op = dpf.operators.math.exponential(field=expt) exp = exp_op.outputs.field() # elu*exp(-alfasl/(1+m2)*stressterm) strainlimit_op = dpf.operators.math.scale(field=exp, ponderation=m2) strainlimit = strainlimit_op.outputs.field() .. GENERATED FROM PYTHON SOURCE LINES 157-159 Strain limit condition (less than 1 pass the criteria) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. GENERATED FROM PYTHON SOURCE LINES 159-162 .. code-block:: Python strainratio = dpf.operators.math.component_wise_divide(fieldA=eppleqvave, fieldB=strainlimit) strainratio = strainratio.outputs.field() .. GENERATED FROM PYTHON SOURCE LINES 163-165 Strain limit condition is plot ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. GENERATED FROM PYTHON SOURCE LINES 165-167 .. code-block:: Python model.metadata.meshed_region.plot(strainratio) dpf.server.shutdown_all_session_servers() .. image-sg:: /examples/04-advanced/images/sphx_glr_10-asme_secviii_divtwo_001.png :alt: 10 asme secviii divtwo :srcset: /examples/04-advanced/images/sphx_glr_10-asme_secviii_divtwo_001.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-timing **Total running time of the script:** (0 minutes 1.876 seconds) .. _sphx_glr_download_examples_04-advanced_10-asme_secviii_divtwo.py: .. only:: html .. container:: sphx-glr-footer sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: 10-asme_secviii_divtwo.ipynb <10-asme_secviii_divtwo.ipynb>` .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: 10-asme_secviii_divtwo.py <10-asme_secviii_divtwo.py>` .. container:: sphx-glr-download sphx-glr-download-zip :download:`Download zipped: 10-asme_secviii_divtwo.zip <10-asme_secviii_divtwo.zip>` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_