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This model illustrates the behavior of the Frazer Nash rubber model using a single element.
Introduction
*MAT_FRAZER_NASH_RUBBER_MODEL
Frazer-Nash Single Element
LS-DYNA Manual Section: *MAT_FRAZER_NASH_RUBBER_MODEL
Example: Frazer-Nash Single Element
Filename: mat_fn_rubber.element.k
Description:
This model illustrates the behavior of the Frazer Nash rubber model using a
single element.
Model:
The example contains a single element which measures 7.5 * 7.5 * 100. The
element is constrained in the z-direction on the bottom and has prescribed
velocity on the top surface.
Input:
Unitary input for any constant indicates least squares curve fitting.
(*MAT_FRAZER_NASH_RUBBER). The least squares curve fit requires specimen
dimensions and a stress-strain load curve. The model provides the option to
stop the calculation based on maximum and minimum strain values.
Results:
The compressibility of the element and the pressure versus a verage strain are
shown in the plots..
References:
Kenchington, D. C.
Keywords
*BOUNDARY_PRESCRIBED_MOTION_NODES
*CONTROL_ENERGY
*CONTROL_HOURGLASS
*CONTROL_TERMINATION
*CONTROL_TIMESTEP
*DATABASE_BINARY_D3PLOT
*DATABASE_BINARY_D3THDT
*DATABASE_ELOUT
*DATABASE_GLSTAT
*DATABASE_HISTORY_NODE
*DATABASE_HISTORY_SOLID
*DATABASE_MATSUM
*DATABASE_NODOUT
*DEFINE_CURVE
*DEFINE_VECTOR
*ELEMENT_SOLID
*END
*KEYWORD
*MAT_FRAZER_NASH_RUBBER_MODEL
*NODE
*PART
*SECTION_SOLID
*TITLE
*KEYWORD
*TITLE
Test for Frazer-Nash Material Model
$
$ LSTC Example
$
$ Last Modified: September 18, 1997
$
$ Units: kg, mm, ms, kN, GPa, kN-mm
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Control Ouput
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTROL_TERMINATION
$ endtim endcyc dtmin endneg endmas
20.0
$
*CONTROL_ENERGY
$ hgen rwen slnten rylen
2
$
*CONTROL_HOURGLASS
$ ihq qh
1 0.05
$
*CONTROL_TIMESTEP
$ dtinit tssfac isdo tslimt dt2ms lctm erode ms1st
5.000E-01
$
$
*DATABASE_BINARY_D3PLOT
$ dt lcdt
0.1
$
*DATABASE_BINARY_D3THDT
$ dt lcdt
0.1
$
*DATABASE_ELOUT
$ dt
0.1
$
*DATABASE_HISTORY_SOLID
$ id1 id2 id3 id4 id5 id6 id7 id8
1
$
*DATABASE_GLSTAT
$ dt
0.1
$
*DATABASE_MATSUM
$ dt
0.1
$
*DATABASE_NODOUT
$ dt
0.1
$
*DATABASE_HISTORY_NODE
$ id1 id2 id3 id4 id5 id6 id7 id8
1
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Boundary Conditions - Prescribed Motion
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*BOUNDARY_PRESCRIBED_MOTION_NODES
$ nid dof vad lcid sf vid
1 4 2 1 4.000E-02 1
2 4 2 1 4.000E-02 1
3 4 2 1 4.000E-02 1
4 4 2 1 4.000E-02 1
$
*DEFINE_VECTOR
$ vid xt yt zt xh yh zh
1 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00-1.000E+00
$
*DEFINE_CURVE
$ lcid sidr scla sclo offa offo
1
$ abscissa ordinate
0.00000000E+00 0.00000000E+00
2.00000000E+00 7.13000011E+00
4.00000000E+00 1.35200005E+01
6.00000000E+00 1.86100006E+01
8.00000000E+00 2.18700008E+01
1.00000000E+01 2.30000000E+01
1.20000000E+01 2.18700008E+01
1.40000000E+01 1.86100006E+01
1.60000000E+01 1.35200005E+01
1.80000000E+01 7.13000011E+00
2.00000000E+01 0.00000000E+00
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Parts and Materials
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*PART
$ pid sid mid eosid hgid adpopt
Rubber
1 1 1
$
$
*MAT_FRAZER_NASH_RUBBER_MODEL
$ mid ro pr c100 c200 c300 c400
1 1.254E-06 0.495 1.000E+00 0.000E+00
$
$ c110 c210 c010 c020 exit emax emin
1.000E+00 0.000E+00 1.000E+00 1.000E+00 1.000E+00 9.000E-01-9.000E-01
$
$ sgl sw st lcid
1.000E+00 1.000E+00 1.000E+00 2
$
$
*SECTION_SOLID
$ sid elform
1 0
$
$$$$ Force versus actual change in guage length for F_N rubber model.
$
*DEFINE_CURVE
$ lcid sidr scla sclo offa offo
2
$ abscissa ordinate
0.00000000E+00 0.00000000E+00
6.07299991E-03 3.59800004E-04
1.24500003E-02 6.25399989E-04
1.88100003E-02 8.85999994E-04
2.53199991E-02 1.24600006E-03
3.11200004E-02 1.71500002E-03
3.71199995E-02 2.40099989E-03
4.32099998E-02 3.35399993E-03
4.92900014E-02 4.59800009E-03
5.42900003E-02 5.86300017E-03
5.93000017E-02 7.36099994E-03
6.43299967E-02 9.10999998E-03
6.94399998E-02 1.11400001E-02
7.27799982E-02 1.26200002E-02
7.60900006E-02 1.41899996E-02
7.94499964E-02 1.59000009E-02
8.28600004E-02 1.77500006E-02
8.40499997E-02 1.84300002E-02
8.52300003E-02 1.91099998E-02
8.64199996E-02 1.98199991E-02
8.76099989E-02 2.05400009E-02
1.08700001E+00 2.01999998E+00
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Nodes and Elements
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$
*END
Animated Result
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