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Protection against Plastic Collapse-Global Criteria: Elastic Stress
Analysis Method.
The design approach is followed as per ASME BPVC.VIII.2-2019, Part 5,
Subpart 5.2.2. This class focuses on the ANSYS submodeling process.
What is Submodeling:
Submodeling is a technique used in finite element analysis to obtain
more detailed results in a specific region of interest within a larger model.
This can be useful when you want to focus on a smaller area of your structure
where high stresses or complex behaviour is expected. The submodeling approach
involves creating a smaller, more refined model of the region of interest
within the larger model.
The initial model is run with a coarse mesh and identifies peak stress
location. To extract accurate results at the critical region, a submodeling
approach is used. The membrane and membrane + bending stress are calculated
using the stress linearization technique.
Steps followed for the sub-modeling process in ANSYS:
<!--[if !supportLists]-->1.
<!--[endif]-->Create
the Initial Model
Start using a coarse mesh for the analysis. Ensure that your global mesh
has a more sensible size. It must pass the aspect ratio test at the element
quality level. Tet mesh analysis might be used to begin.The pressure vessel
model has been built using tet mesh. The loads and boundary conditions are
implemented in accordance with ASME BPVC.VIII.2-2019, Part 5, Subpart 5.2.2.
2. Identify
the Region of Interest
Determine
the specific region within the global model where you need more detailed
results. Define a new model that represents the smaller region of interest.
This model typically has a finer mesh and more accurate boundary conditions.
Generate a mesh for the submodel, ensuring that it captures the details of the
structure in the region of interest.
3.
Apply
Boundary Conditions
Transfer
the boundary conditions from the global model to the submodel to ensure
consistency.
4. Results
The
vonMises stress plot for the submodel is shown in Fig. Nice stress distribution
at the area of interest can be seen in Fig.
5. Stress
Linearization Results
The
Stress Classification Line (SCL) is considered at the region of maximum stress
through the wall thickness. ASME rules are used to compute the allowable limits
for the membrane and membrane plus bending. The membrane stress and membrane
plus bending stresses from the stress linearization are compared to the
permitted limits. The FEA findings are within the permitted limitations.
On Going Training: Pressure Vessel Design As per ASME Sec-VIII Div 2. Please contact at info@pe-fea.com for the training details.
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