INTER195


3-D 8-Node Gasket

Compatible Products: – | – | – | Enterprise | Ent PP | Ent Solver | –

INTER195 Element Description

INTER195 is a 3-D 8-node linear interface element. When used with 3-D linear structural elements (SOLID65, SOLID185, SOLSH190, SOLID272, SOLID273, and SOLID285), INTER195 simulates gasket joints. It is defined by eight nodes having three degrees of freedom at each node: translations in the nodal x, y, and z directions.

See Gasket Material and INTER195 in the Mechanical APDL Theory Reference for more details about this element.

Also see Gasket Joints Simulation in the Structural Analysis Guide for more details on this ANSYS capability.

Figure 195.1:  INTER195 Geometry

INTER195 Geometry

INTER195 Input Data

The element geometry, node locations, connectivity, and the nodal coordinate system are shown in Figure 195.1: INTER195 Geometry. The element geometry is defined by 8 nodes, which form bottom and top surfaces of the element. The bottom surface is defined by nodes, I, J, K, L; and the top surface is defined by nodes, M, N, O, P. As shown, the element connectivity is defined as I, J, K, L, M, N, O, P.

Temperatures may be input as element body loads at the nodes. The node I temperature T(I), defaults to TUNIF. If all other temperatures are unspecified, they default to T(I). For any other input pattern, unspecified temperatures default to TUNIF.

By default, the element is capable of both through-thickness and transverse shear deformations (KEYOPT(2) = 1). The inclusion of transverse shear stiffness is generally required when the interfaces between the gasket and the mating parts are modeled as sliding contact. However, if the interfaces are modeled with a matching mesh method (that is, with coincident nodes), ANSYS, Inc. recommends using through-thickness deformation only (KEYOPT(2) = 0) to avoid unnecessary in-plane interaction between the gasket and the mating parts.

You can define element orientation (ESYS) as described in Coordinate Systems:

Figure 195.2:  INTER95 Element Orientation

INTER95 Element Orientation

The next table summarizes the element input. See Element Input in the Element Reference for a general description of element input.

INTER195 Input Summary

Nodes

I, J, K, L, M, N, O, P

Degrees of Freedom

UX, UY, UZ

Real Constants

None

Material Properties

TB command: Gasket material

MP command: BETD, ALPX (or CTEX or THSX), DMPR

Body Loads
Temperatures -- 

T(I), T(J), T(K), T(L), T(M), T(N), T(O), T(P)

Special Features
Linear perturbation
KEYOPT(2)

Element deformation:

0  -- 

Through-thickness deformation only

1 -- 

Through-thickness and transverse shear deformation (default)

KEYOPT(8)

Element component quantity output:

0  -- 

Gasket quantities are output (GKD, GKD, GKI, and GKTH) (default)

1 -- 

Regular stresses and strains are output (including S, EPEL, and EPTH )

INTER195 Output Data

The solution output associated with the element is in two forms:

The output directions for element items are parallel to the local element coordinate system based on the element midplane as illustrated in Figure 195.3: INTER195 Stress Output. See Gasket Material in the Mechanical APDL Theory Reference for details.

A general description of solution output is given in Solution Output. See the Basic Analysis Guide for ways to review results.

Figure 195.3:  INTER195 Stress Output

INTER195 Stress Output

The Element Output Definitions table uses the following notation:

A colon (:) in the Name column indicates that the item can be accessed by the Component Name method (ESOL). The O column indicates the availability of the items in the file Jobname.OUT. The R column indicates the availability of the items in the results file.

In either the O or R columns, “Y” indicates that the item is always available, a number refers to a table footnote that describes when the item is conditionally available, and “-” indicates that the item is not available.

Table 195.1:  INTER195 Element Output Definitions

NameDefinitionOR
ELElement number-Y
NODESNode connectivity - I, J, K, L, M, N, O, P-Y
MATMaterial number-Y
TEMPTemperatures T(I), T(J), T(K), T(L), T(M), T(N), T(O), T(P)-Y
GKS:X, (XY)

X - Normal stress (also gasket pressure)

XY - Transverse shear stress

YY
GKD:X, (XY)

X - Total closure

XY - Relative transverse shear deformation (, where is the transverse shear strain, and is the gasket thickness.

YY
GKDI:X, (XY, XZ)Total inelastic closureYY
GKTH:X, (XY, XZ)Thermal closureYY
S:X, Y, Z, XYStresses -1
S:INTStress intensity -1
S:EQVEquivalent stress -1
EPEL:X, Y, Z, XYElastic strains -1
EPEL:EQVEquivalent elastic strain -1
EPTH:X, Y, Z, XYThermal strains -1
EPTH:EQVEquivalent thermal strain -1
SEND:ELASTICStrain energy densities-1

  1. To save these results to the .rst file, set KEYOPT(8) = 1.

INTER195 Assumptions and Restrictions

  • This element is not supported for initial stress.

  • Pressure as a type of surface load on element faces is not supported by this element.

INTER195 Product Restrictions

There are no product-specific restrictions for this element.


Release 18.2 - © ANSYS, Inc. All rights reserved.