Thin Shell dialog box (Multiphysics)

Physical Property Table
Name	Defines the name of the physical property table.
Label	Defines the unique numeric identifier for the physical property table.
Properties
Material
Plane Strain	Treats the associated elements as 2D plane strain elements. The structural solver interprets in-plane loads applied to plane strain elements as line-loads with a value equal to the load divided by the thickness. For example, if you specify a thickness value of 1.0, then the value of the line-load equals the load value. Pressure can be approximated with multiple line loads where the pressure value equals the line-load divided by the length between the loads.Clear this check box to treat the associated elements as 2D plane stress elements.
Material 1	Lets you specify the material to use for the membrane. Select an existing material from the list or click Choose Material to create a new material.Note: The thermal solver always uses this material for the associated elements.If you do not select a material from the Material 1 list, the associated elements will have no membrane or coupling stiffness in the structural solver.This option corresponds to the MID1 field in the PSHELL bulk data entry.
Use Material 1 for Material 2	Appears when Plane Strain is cleared.Uses the material you selected from the Material 1 list as the bending material.
Material 2	Appears when Use Material 1 for Material 2 is cleared.Lets you specify the material to use for the bending material. Select an existing material from the list or click Choose Material to create a new material.If you do not select a material from the Material 2 list, or select the Use Material 1 for Material 2 check box, the associated elements will have no bending, coupling, or transverse shear stiffness.This option corresponds to the MID2 field in the PSHELL bulk data entry.
Use Material 1 for Material 3	Appears when Plane Strain is cleared.Uses the material you selected from the Material 1 list as the transverse shear material.
Material 3	Appears when Use Material 1 for Material 3 is cleared.Lets you specify the material to use for the transverse shear material. Select an existing material from the list or click Choose Material to create a new material.If you do not select a material from the Material 3 list, or select the Use Material 1 for Material 3 check box, the associated elements will have no transverse shear flexibility.This option corresponds to the MID3 field in the PSHELL bulk data entry.
Material 4	Appears when Plane Strain is cleared.Lets you specify the material to use for membrane-bending coupling.You should not specify a Material 4 material if the material properties are symmetric.This option corresponds to the MID4 field in the PSHELL bulk data entry.
Thickness
Thickness	Specifies the thickness of the associated 2D thin shell elements. The thermal solver uses this value to calculate the volume of the elements and the surface area of the element edges.
Bending Coefficient of Inertia Ratio	Appears when the structural solver is present.Sets the bending moment of inertia ratio, 12I/T3. Defines the ratio of the actual bending moment inertia of the shell, I, to the bending moment of inertia of a homogenous shell, T3/12.This option corresponds to the 12I/T**3 field in the PSHELL bulk data entry.
Transverse Shear Thickness Ratio	Appears when the structural solver is present.Sets the transverse shear thickness ratio, Ts/T. This is the ratio of the shear thickness, (Ts) to the membrane thickness of the shell, T.This option corresponds to the TS/T field in the PSHELL bulk data entry.
Divide Thickness into Uniform Layers	Appears when only the thermal solver is present.Divides the shell thickness that you specify equally into the number of layers you specify in the Number of Layers box.
Non-Structural Mass
Non-Structural Mass per Area	Sets the mass per area of the associated 2D thin shell elements.
Non-Structural Mass Material	Appears when the thermal solver is present.Assigns a different isotropic material with thermal properties to the non-structural mass.Select a material from the list of materials assigned to the model, or click Choose material to define a new material.
Fiber Distance
Appears when the structural solver is present.
Fiber Distance, Z1****Fiber Distance, Z2	Set the fiber distances for stress calculations. The positive direction is determined by the right-hand rule.The default for Z1 is -T/2.The default for Z2 is +T/2.T is the local plate thickness.These options correspond to the Z1 and Z2 fields in the PSHELL bulk data entry.
Thermo-Optical Properties
Appears when the thermal solver is present.
Radiation	Activates radiation calculations for the elements in the mesh collector. Select None if you do not want to compute radiation.You can activate radiation calculation for the following faces of the shell: top face, bottom face, or both top and bottom faces.
Top****Bottom	Define the emissivity for modeling radiation.Black BodyDefines an emissivity of 1.Thermo-Optical PropertiesDefines a constant or temperature-varying emissivity.Thermo-Optical Properties-AdvancedDefines the infrared and solar thermo-optical properties for modeling gray radiation or wavelength-dependent thermo-optical properties for modeling non-gray radiation.Select Black Body or a modeling object from the list, or click Open Manager to define a new modeling object.Click Edit to modify the specified modeling object.Click More Options to search and filter regions. The following options are available.FindLets you search for an object by entering the full name of the object. For example, to find a region named ABC_region, type ABC_region in the search box and press Enter or click Find . If the object is found, it will be selected automatically.Filter by NameLets you filter the list by the names of the objects. This filter supports wildcards. The default wildcard is the asterisk (), and it displays all entries in the list. For example, to filter the list to display every object with a name starting with the letter “a," enter a as the filter string.
Top to Bottom Couplings
Appears when Radiation is set to Top and Bottom.
Create Top and Bottom as Two-Layer Shells	Treats the top and bottom sides of the element as separate, parallel elements. Each parallel element is half as thick as the defined total element thickness.If you do not select this option, the thermal solver models conduction in only two dimensions. For example, when the through-plane temperature differential is insignificant, each element has a single temperature value with no distinction between top and bottom sides.
Account for	Appears when Create Top and Bottom as Two-Layer Shells is selected.Specifies the type of heat transfer that takes place between the top and bottom sides of the element.ConductionSpecifies conductive heat transfer between the top and bottom layers using the value that you set in the Heat Transfer Coefficient box. No heat transfer is calculated based on the assigned thermal conductivity or specified thickness value in the associated physical property table.RadiationSpecifies radiative heat transfer between the top and bottom layers using the value that you set in the Effective Emissivity box. No heat transfer is calculated based on the assigned thermal conductivity or specified thickness value in the associated physical property table.You can calculate the effective emissivity value by multiplying the known emissivity of the layer by the known gray body view factor between the layers. The gray body view factor is the fraction of total radiative energy that leaves one element and that is absorbed by another.Conduction and RadiationSpecifies that both conductive and radiative heat transfer be accounted for using the specified Heat Transfer Coefficient and Effective Emissivity values.NoneSpecifies that no heat transfer exists between the top and bottom sides.

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Thin Shell dialog box (Multiphysics), Simcenter 3D 2021.1 Series

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