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*** WARNING *** CP = 3160.128 TIME= 18:48:54
Contact element 13203 (real ID 6) status changes abruptly from contact
(with target element 13079) -> no-contact.
*** WARNING *** CP = 3366.767 TIME= 18:50:56
Contact element 12905 (real ID 5) status changes abruptly from contact
(with target element 12647) -> no-contact.
我后来查看了这两个接触对,图片如下
这张是Contact element 13203和target element 13079,图中选中的那一点即为这两个单元。(是螺栓帽的小环和钢板的接触)
这张是Contact element 12905和target element 12647,图中所选的那一小块即为这两个单元。(这是上下两块钢板所形成的接触)
中间的孔均为螺栓孔。
然后就出现*** ERROR *** CP = 3571.658 TIME= 18:52:50
One or more elements have become highly distorted. Excessive
distortion of elements is usually a symptom indicating the need for
corrective action elsewhere. Try incrementing the load more slowly
(increase the number of substeps or decrease the time step size). You
may need to improve your mesh to obtain elements with better aspect
ratios. Also consider the behavior of materials, contact pairs,
and/or constraint equations. If this message appears in the first
iteration of first substep, be sure to perform element shape checking.
*** WARNING *** CP = 3571.846 TIME= 19:06:11
The unconverged solution (identified as time 5 substep 999999) is
output for analysis debug purposes. Results should not be used for
any other purpose.
*** ERROR *** CP = 3573.265 TIME= 19:06:12
LSSOLVE looping is stopped because solution is unconvergent and NCNV,1
set.
不收敛了!
下面使用cncheck检查的结果,希望各位高手施于援手~~
并且用12.0总是算不了几步,用10.0却可以计算很多荷载步,不知何故?
*** NOTE *** CP = 5.366 TIME= 19:58:35
The default contact stiffness starting from Release 12.0 is no longer
affected by defined plasticities input by the TB commands. You should
confirm that the appropriate contact stiffness was used.
*** NOTE *** CP = 5.569 TIME= 19:58:35
Deformable-deformable contact pair identified by real constant set 1
and contact element type 4 has been set up.
Contact algorithm: Augmented Lagrange method
Contact detection at: Gauss integration point
Default contact stiffness factor FKN 1.0000
The resulting contact stiffness 0.41200E+06
Default penetration tolerance factor FTOLN 0.10000
The resulting penetration tolerance 1.0000
Max. initial friction coefficient MU 0.40000
Default tangent stiffness factor FKT 1.0000
Default Max. friction stress TAUMAX 0.10000E+21
Average contact surface length 14.669
Average contact pair depth 10.000
Default pinball region factor PINB 2.0000
The resulting pinball region 20.000
*WARNING*: Initial penetration is included.
*** NOTE *** CP = 5.569 TIME= 19:58:35
Max. Initial penetration 0 was detected between contact element 11583
and target element 11512.
****************************************
*** NOTE *** CP = 5.569 TIME= 19:58:35
Deformable-deformable contact pair identified by real constant set 2
and contact element type 4 has been set up.
Contact algorithm: Augmented Lagrange method
Contact detection at: Gauss integration point
Default contact stiffness factor FKN 1.0000
The resulting contact stiffness 0.41200E+06
Default penetration tolerance factor FTOLN 0.10000
The resulting penetration tolerance 1.0000
Max. initial friction coefficient MU 0.40000
Default tangent stiffness factor FKT 1.0000
Default Max. friction stress TAUMAX 0.10000E+21
Average contact surface length 15.444
Average contact pair depth 10.000
Default pinball region factor PINB 2.0000
The resulting pinball region 20.000
*WARNING*: Initial penetration is included.
*** NOTE *** CP = 5.569 TIME= 19:58:35
Max. Initial penetration 2.842170943E-14 was detected between contact
element 12017 and target element 11759.
****************************************
*** NOTE *** CP = 5.569 TIME= 19:58:35
Deformable-deformable contact pair identified by real constant set 3
and contact element type 4 has been set up.
Contact algorithm: Augmented Lagrange method
Contact detection at: Gauss integration point
Default contact stiffness factor FKN 1.0000
The resulting contact stiffness 0.51500E+06
Default penetration tolerance factor FTOLN 0.10000
The resulting penetration tolerance 0.80000
Max. initial friction coefficient MU 0.40000
Default tangent stiffness factor FKT 1.0000
Default Max. friction stress TAUMAX 0.10000E+21
Average contact surface length 14.669
Average contact pair depth 8.0000
Default pinball region factor PINB 2.0000
The resulting pinball region 16.000
*WARNING*: Initial penetration is included.
*** NOTE *** CP = 5.569 TIME= 19:58:35
Max. Initial penetration 1.421085472E-14 was detected between contact
element 12292 and target element 12192.
****************************************
*** NOTE *** CP = 5.585 TIME= 19:58:35
Deformable-deformable contact pair identified by real constant set 4
and contact element type 4 has been set up.
Contact algorithm: Augmented Lagrange method
Contact detection at: Gauss integration point
Default contact stiffness factor FKN 1.0000
The resulting contact stiffness 0.51500E+06
Default penetration tolerance factor FTOLN 0.10000
The resulting penetration tolerance 0.80000
Max. initial friction coefficient MU 0.40000
Default tangent stiffness factor FKT 1.0000
Default Max. friction stress TAUMAX 0.10000E+21
Average contact surface length 14.669
Average contact pair depth 8.0000
Default pinball region factor PINB 2.0000
The resulting pinball region 16.000
*WARNING*: Initial penetration is included.
*** NOTE *** CP = 5.585 TIME= 19:58:35
Max. Initial penetration 1.421085472E-14 was detected between contact
element 12485 and target element 12361.
****************************************
*** NOTE *** CP = 5.585 TIME= 19:58:35
Deformable-deformable contact pair identified by real constant set 5
and contact element type 4 has been set up.
Contact algorithm: Augmented Lagrange method
Contact detection at: Gauss integration point
Default contact stiffness factor FKN 1.0000
The resulting contact stiffness 0.41200E+06
Default penetration tolerance factor FTOLN 0.10000
The resulting penetration tolerance 1.0000
Max. initial friction coefficient MU 0.40000
Default tangent stiffness factor FKT 1.0000
Default Max. friction stress TAUMAX 0.10000E+21
Average contact surface length 15.444
Average contact pair depth 10.000
Default pinball region factor PINB 2.0000
The resulting pinball region 20.000
*WARNING*: Initial penetration is included.
*** NOTE *** CP = 5.585 TIME= 19:58:35
Max. Initial penetration 2.842170943E-14 was detected between contact
element 12830 and target element 12574.
****************************************
*** NOTE *** CP = 5.585 TIME= 19:58:35
Deformable-deformable contact pair identified by real constant set 6
and contact element type 4 has been set up.
Contact algorithm: Augmented Lagrange method
Contact detection at: Gauss integration point
Default contact stiffness factor FKN 1.0000
The resulting contact stiffness 0.41200E+06
Default penetration tolerance factor FTOLN 0.10000
The resulting penetration tolerance 1.0000
Max. initial friction coefficient MU 0.40000
Default tangent stiffness factor FKT 1.0000
Default Max. friction stress TAUMAX 0.10000E+21
Average contact surface length 14.669
Average contact pair depth 10.000
Default pinball region factor PINB 2.0000
The resulting pinball region 20.000
*WARNING*: Initial penetration is included.
*** NOTE *** CP = 5.585 TIME= 19:58:35
Max. Initial penetration 0 was detected between contact element 13191
and target element 13122.
****************************************
*** NOTE *** CP = 5.585 TIME= 19:58:35
Deformable-deformable contact pair identified by real constant set 7
and contact element type 4 has been set up.
Contact algorithm: Augmented Lagrange method
Contact detection at: Gauss integration point
Default contact stiffness factor FKN 1.0000
The resulting contact stiffness 0.29429E+06
Default penetration tolerance factor FTOLN 0.10000
The resulting penetration tolerance 1.4000
Max. initial friction coefficient MU 0.40000
Default tangent stiffness factor FKT 1.0000
Default Max. friction stress TAUMAX 0.10000E+21
Average contact surface length 14.669
Average contact pair depth 14.000
Default pinball region factor PINB 2.0000
The resulting pinball region 28.000
*WARNING*: Initial penetration is included.
*** NOTE *** CP = 5.585 TIME= 19:58:35
Max. Initial penetration 3.552713679E-15 was detected between contact
element 13329 and target element 13276.
****************************************
*** NOTE *** CP = 5.585 TIME= 19:58:35
Deformable-deformable contact pair identified by real constant set 8
and contact element type 4 has been set up.
Contact algorithm: Augmented Lagrange method
Contact detection at: Gauss integration point
Default contact stiffness factor FKN 1.0000
The resulting contact stiffness 0.29429E+06
Default penetration tolerance factor FTOLN 0.10000
The resulting penetration tolerance 1.4000
Max. initial friction coefficient MU 0.40000
Default tangent stiffness factor FKT 1.0000
Default Max. friction stress TAUMAX 0.10000E+21
Average contact surface length 14.448
Average contact pair depth 14.000
Default pinball region factor PINB 2.0000
The resulting pinball region 28.000
*** NOTE *** CP = 5.585 TIME= 19:58:35
One of the contact searching regions contains at least 68 target
elements. You may reduce the pinball radius.
*WARNING*: Initial penetration is included.
*** NOTE *** CP = 5.585 TIME= 19:58:35
Max. Initial penetration 7.105427358E-15 was detected between contact
element 13623 and target element 13465.
****************************************
*** NOTE *** CP = 5.585 TIME= 19:58:35
Deformable-deformable contact pair identified by real constant set 9
and contact element type 4 has been set up.
Contact algorithm: Augmented Lagrange method
Contact detection at: Gauss integration point
Default contact stiffness factor FKN 1.0000
The resulting contact stiffness 0.29429E+06
Default penetration tolerance factor FTOLN 0.10000
The resulting penetration tolerance 1.4000
Max. initial friction coefficient MU 0.40000
Default tangent stiffness factor FKT 1.0000
Default Max. friction stress TAUMAX 0.10000E+21
Average contact surface length 14.669
Average contact pair depth 14.000
Default pinball region factor PINB 2.0000
The resulting pinball region 28.000
*WARNING*: Initial penetration is included.
*** NOTE *** CP = 5.585 TIME= 19:58:35
Max. Initial penetration 0 was detected between contact element 13938
and target element 13875.
****************************************
*** NOTE *** CP = 5.585 TIME= 19:58:35
Deformable-deformable contact pair identified by real constant set 10
and contact element type 4 has been set up.
Contact algorithm: Augmented Lagrange method
Contact detection at: Gauss integration point
Default contact stiffness factor FKN 1.0000
The resulting contact stiffness 0.29429E+06
Default penetration tolerance factor FTOLN 0.10000
The resulting penetration tolerance 1.4000
Max. initial friction coefficient MU 0.40000
Default tangent stiffness factor FKT 1.0000
Default Max. friction stress TAUMAX 0.10000E+21
Average contact surface length 14.537
Average contact pair depth 14.000
Default pinball region factor PINB 2.0000
The resulting pinball region 28.000
*** NOTE *** CP = 5.585 TIME= 19:58:35
One of the contact searching regions contains at least 68 target
elements. You may reduce the pinball radius.
*WARNING*: Initial penetration is included.
*** NOTE *** CP = 5.585 TIME= 19:58:35
Max. Initial penetration 2.842170943E-14 was detected between contact
element 14242 and target element 14084.
****************************************
*** WARNING *** CP = 5.585 TIME= 19:58:35
Maximum friction coefficient 0.4 is defined in the model. Switch to
the unsymmetric solver (NROP,UNSYM) instead if convergence difficulty
is encountered.
10 CONTACT PAIRS ARE SELECTED
CONTACT PAIR HAVING REAL ID = 1 IS INITIALLY CLOSED
CONTACT PAIR HAVING REAL ID = 2 IS INITIALLY CLOSED
CONTACT PAIR HAVING REAL ID = 3 IS INITIALLY CLOSED
CONTACT PAIR HAVING REAL ID = 4 IS INITIALLY CLOSED
CONTACT PAIR HAVING REAL ID = 5 IS INITIALLY CLOSED
CONTACT PAIR HAVING REAL ID = 6 IS INITIALLY CLOSED
CONTACT PAIR HAVING REAL ID = 7 IS INITIALLY CLOSED
CONTACT PAIR HAVING REAL ID = 8 IS INITIALLY CLOSED
CONTACT PAIR HAVING REAL ID = 9 IS INITIALLY CLOSED
CONTACT PAIR HAVING REAL ID = 10 IS INITIALLY CLOSED
请问这些接触都是哪错了呢。
下面是面面接触的生成命令流
/prep7
allsel
!生成接触单元
*do,k,3,21,2 !10组循环
ET,3,targe170 !定义三维目标单元为targe170
ET,4,conta174 !定义三维接触单元为conta17
j=(k-1)/2
r,j !定义接触实常数j
real,j
!前面已经定义了mp,mu,8,0.3,材料8,在这就不定义了
mat,8 !指定材料8
cmsel,s,tar%j% !target
type,3 !指定目标单元类型k
nsla,s,1 !选择目标面上的所有节点,包括边界点
esln,s,0 !选择依附于这些节点的单元
esurf,all !构建目标单元 ESURF, XNODE, Tlab, Shape
cmsel,s,con%j% !contact
type,4 !指定接触单元类型k+1
nsla,s,1 !选择接触面上的所有节点,包括边界点
esln,s,0 !选择依附于这些节点的单元
esurf,all
*enddo
allsel,all
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