求解出现问题

在计算求解时 ，出现下面的错误，请高手指点迷津：
“ Error material number 3 specified type =8 requires
an equation of state
input phase completed with 1 fatal errors”
这应该怎么修改哦 ？
下面是k文件中的材料关键字文件：
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$
$ SECTION DEFINITIONS $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$
$
*SECTION_SOLID
1 1
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$
$ MATERIAL DEFINITIONS $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$
$
*MAT_JOHNSON_COOK
1,7.83,0.77
7.920e-03,5.100e-003,0.260,0.140e-01,1.03,0.1793e+04,294,0.100e-05
0.477e-05,-9.00e+00,3.00,0.0,5.00,0.00,0.00,0.00
0.00
$
*EOS_GRUNEISEN
1,0.4569,1.490,0.00,0.00,2.17,0.46,0.00
1.00
*MAT_NULL
2,1.02,0.00,0.00,0.00,0.00,0.00,0.00
*EOS_GRUNEISEN
2,0.150,0.00,0.00,0.00,0.00,0.00,0.00
0.00
*MAT_HIGH_EXPLOSIVE_BURN
3,1.6300000,0.693000,0.2700000,0.000000,0.000000,0.000000,0.000000
*EOS_JWL
3,3.7400002,7.3300E-02,4.1500001,0.95000,0.30000,0.07000,1.0000
$
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$
$ PARTS DEFINITIONS $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$
$
$
*PART
Part 1 for Mat 1 and Elem Type 2
1 1 1 1 0 0 0
$
*PART
Part 2 for Mat 2 and Elem Type 2
2 1 2 2 0 0 0
$
*PART
Part 3 for Mat 3 and Elem Type 2
3 1 3 0 0 0 0
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$
$ ELEMENT DEFINITIONS $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$
$