When solving structural analyses with temperature-dependent coefficient of thermal expansion, how small of a timestep do I need to ensure accuracy?
Tagged: 2019 R1, General, mechanical, structural-mechanics, thermal
January 25, 2023 at 7:34 amFAQParticipant
In purely structural analyses, deformation is the DOF, so materials that are dependent on strain (or deformation) trigger a nonlinear solution. Temperature-dependent coefficient of thermal expansion (CTE) or temperature-dependent elastic modulus do not cause a nonlinear structural solution, as temperature is a known input. (While CTE may be a nonlinear function of temperature, for example, it is still considered a ‘linear’ material insofar as structural analyses are concerned, as CTE is not a function of deformation or of strain.) These materials are also not path-dependent, so the timestep size will not affect solution accuracy. If temperature-dependent plasticity or creep is present, the accuracy will be dictated by the timestep size because these materials are path-dependent, whether or not they are temperature-dependent. In a heat transfer analysis, temperature-dependent materials will always trigger a nonlinear solution because, in thermal analyses, temperature is the DOF. Therefore, any materials dependent upon temperature will require Newton-Raphson method in heat transfer analyses.
Introducing Ansys Electronics Desktop on Ansys Cloud
The Watch & Learn video article provides an overview of cloud computing from Electronics Desktop and details the product licenses and subscriptions to ANSYS Cloud Service that are...
How to Create a Reflector for a Center High-Mounted Stop Lamp (CHMSL)
This video article demonstrates how to create a reflector for a center high-mounted stop lamp. Optical Part design in Ansys SPEOS enables the design and validation of multiple...
Introducing the GEKO Turbulence Model in Ansys Fluent
The GEKO (GEneralized K-Omega) turbulence model offers a flexible, robust, general-purpose approach to RANS turbulence modeling. Introducing 2 videos: Part 1 provides background information on the model and a...
Postprocessing on Ansys EnSight
This video demonstrates exporting data from Fluent in EnSight Case Gold format, and it reviews the basic postprocessing capabilities of EnSight.
- The warning message is: “The maximum contact stiffness is too big. This may affect the accuracy of the results.” Why does large contact stiffness affect results accuracy?
- Contact Definitions in ANSYS Workbench Mechanical
- After Workbench crashes, how can I recover the project from a .mechdb file?
- Model has a large number of contacts – how to reduce them?
- How to resolve “Error: Invalid Geometry”?
- How to deal with “”Problem terminated — energy error too large””?”
- The LS-DYNA equivalent of *MODEL_CHANGE card (in ABAQUS). Which keywords can be used to introduce(activate)/delete(deactivate) elements in the middle of a calculation (at user-specific time/load steps).
- How to display the color of each body based on the material in Mechanical?
- How to locate an element of a particular ID number in Mechanical?
- Please explain the difference between Point Mass and Distributed Mass.
© 2023 Copyright ANSYS, Inc. All rights reserved.