3D Connexion Version 6.6

*SURFACE BEHAVIOR

Data line for PRESSURE-OVERCLOSURE=EXPONENTIAL:

First (and only) line:

1. Clearanceat which the contact pressure is zero, (see Figure 18.47–1).

2. Pressureat zero clearance, .

The following data item is available only in ABAQUS/Explicit analyses:

3. Value of the maximum stiffness, . When using penalty contact, large stiffness value s

obtained from the exponential law may signiﬁcantly lower the stab le time increment size.

Choose a suitable maximum stiffness to mitigate this effect (see Figure 18.47–1). By default,

is set equal to inﬁnity for kinematic contact and the defaultpenalty stiffness for penalty

contact.

Data line for PRESSURE-OVERCLOSURE=LINEAR:

First (and only) line:

1. Slopeof the pressure-overclosure curve. This value must be positive.

Data line for PRESSURE-OVERCLOSURE=SCALEFACTOR:

First (and only) line:

1. Overclosure factor, (see Figure 18.47–2), which deﬁnes the over closure measure (used to

delineate the segments of the pressure-overclosure curve) as a percentage of th em inimum

element size in the contact region. This value must be greater than zero. Leave blank if an

overclosure measure (second data item) is speciﬁed.

2. Overclosuremeasure, (see Figure 18.47–2), which deﬁnes the overclosure measure (used to

delineate the segments of thepressure-overclosure curve) directly. This value must be greater

than zero. Leave blank if an overclosure factor (ﬁrst data item) is speciﬁed.

3. Stiffnessscale factor, (seeFigure 18.47–2), which deﬁnes the geometric scaling of the “base”

stiffness and must be greater than one.

4. Initialstiffness scale factor, (see Figure 18.47–2), which deﬁnes an additional scale factor

for the “base”default contact stiffness and must be greater than zero. The default value is one.

Data lines for PRESSURE-OVERCLOSURE=TABULAR:

First line:

1. Pressure.

2. Overclosure.

18.47–3

ABAQUS Version 6.1 Module: ID:

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