Civil Engineering Reference
In-Depth Information
block. Since
(
phi
) is set to zero, the Mohr-Coulomb criterion reduces to the Tresca,
and starting stresses can be set to zero. There is no analytical solution to this problem, but
approximate solutions indicate an increase in 3D above the
φ
(
2
+
π)c
u
recorded in plane
strain.
In our case the 3D ultimate load is computed to be about 5
, as shown in the results
listed in Figure 12.15 Performance data are shown in Figure 12.16
.
4
c
u
phi c psi e v cons
0.0 100.0 0.0 100.0 0.3 0.0
nels nxe nze nip
1000 10 10 8
aa bb cc incs
1.0 1.0 1.0 12
plasits cjits plastol cjtol
250 1000 1.0e-4 1.0e-5
incs,(qinc(i),i=1,incs)
200.0 100.0 50.0 50.0 50.0 30.0
20.0 10.0 10.0 5.0 5.0 5.0
Figure 12.14
Data for Program 12.2 example
This job ran on 8 processors
There are 4961 nodes 1541 restrained and 12580 equations
Time after setup is : 0.169999999998253770
The critical timestep is 0.5200E-01
The displacement is -0.6831E+01
sigma z sigma x sigma y
-0.1966E+03 -0.1236E+03 -0.1236E+03
The total number of cj iterations was 157
The number of plastic iterations was 2
cj iterations per plastic iteration were 78.50
The displacement is -0.1033E+02
sigma z sigma x sigma y
-0.2853E+03 -0.1808E+03 -0.1808E+03
The total number of cj iterations was 388
The number of plastic iterations was 7
cj iterations per plastic iteration were 55.43
.
.
.
The displacement is -0.4098E+02
sigma z sigma x sigma y
-0.5375E+03 -0.3586E+03 -0.3586E+03
The total number of cj iterations was 6040
The number of plastic iterations was 138
cj iterations per plastic iteration were 43.77
This analysis took : 593.080000000001746
Figure 12.15
Results from Program 12.2 example
Mesh
No of Processors Analysis Time(secs)
10x10x10 8 593
16 375
Figure 12.16
Performance statistics: Program 12.2 (IBM SP2)
