You input the general parameters using the TBDATA command, then input the compression and un-
loading data using the TBPT command.
Presented in the following sections are examples of inputs for the various types of gasket data.
10.4.2.1. Define General Parameters
(TBOPT = PARA)
The gasket material general parameters include the initial gap, stable stiffness and the maximum tension
stress cap. These parameters are defined as C1, C2, and C3 in the following example:
TB,GASKET,MAT,NTEMP,NPTS,PARA
TBDATA,1,C1,C2,C3Refer to Gasket Materials in the Material Reference for further details on these parameters.
10.4.2.2. Define Compression Load Closure Curve
(TBOPT = COMP)
The compression pressure closure curve gasket material definition option is defined as follows:
TB,GASKET,MAT,NTEMP,NPTS,COMP
TBPT,,x1,y1
TBPT,,x2,y2
TBPT,,xi,yiwhere: xi, yi are pairs of closure and pressure values.
The following input listing is an example defining a compressive pressure vs. closure behavior of a
gasket joint material with 10 data points.
TB,GASKET,1, ,10,COMP! define compression data
TBPT,, 0.20000E-04, 0.54000E+08
TBPT,, 0.40000E-04, 0.15150E+09
TBPT,, 0.60000E-04, 0.24900E+09
TBPT,, 0.78000E-04, 0.30000E+09
TBPT,, 0.12000E-03, 0.37200E+09
TBPT,, 0.19000E-03, 0.47400E+09
TBPT,, 0.28600E-03, 0.58500E+09
TBPT,, 0.35800E-03, 0.67350E+09
TBPT,, 0.43200E-03, 0.78000E+09
TBPT,, 0.50500E-03, 0.89550E+0910.4.2.3. Define Linear Unloading Data
(TBOPT = LUNL)
The linear unloading gasket material definition option is a simple way to define the gasket unloading
behavior. Several unloading slopes can be defined to accommodate the comprehensive unloading be-
havior as follows:
TB,GASKET,MAT,NTEMP,NPTS,LUNL
TBPT,,x1,y1
TBPT,,x2,y2
TBPT,,xi,yiwhere:NPTS is the number of unloading points; xi is the closure where unloading started, and yi is
unloading slope.
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