|
|
|
|
|
A
lot of examples show that the
performance of standard compatible
8-node compatible solid elements
is unsatisfactory and wrong.
In XFINAS, four kinds of 8-node
hexahedral elements are presented
for the analysis of thick and
thin walled structures. The
XSOLID81~4 solid element
used both the Enhanced Assumed
Strain (EAS) method and Assumed
Natural Strain (ANS) method
to eliminate locking effects.
The XSOLID8R solid element
used the stabilized technique
to control the hourglass mode
and the assumed strain natural
method to eliminate locking
effects. The integration scheme
of the XSOLID81-4 solid
element requires full integration
but the integration scheme of
the XSOLID8R solid element
requires 1 point integration.
The XSOLID84 is implemented
in the current version.
|
|
|
| 
|
|
<
Fig. 13 8-node solid element
>
|
|
|
|
|
|
Example.
Linear analyses of a hemispherical
shell (Fig.14) with 18 degree
hole under pinched loading are
carried out to validate the
bending and membrane behaviour
of XSOLID.
Table
Results of hemispherical shell
with 18° hole (Reference
solution = 0.094)
|
|
|
|
Element
Size
|
Normalized
Solutio
|
|
XSOLID81
|
XSOLID82
|
XSOLID83
|
XSOLID84
|
XSOLID85
|
XSOLID8F
|
|
4*4*1
|
0.0922
|
0.0409
|
0.0897
|
1.0587
|
0.0123
|
0.0007
|
|
8*8*1
|
0.8698
|
0.7446
|
0.8626
|
1.0051
|
0.1838
|
0.0027
|
|
10*10*1
|
0.9533
|
0.9071
|
0.9495
|
0.9993
|
0.3536
|
0.0041
|
|
|
|
|
|
| 
|
|
|
|
|
|
Fig.
14.1 Preprocessing
of Hemispherical
shell
with 18 degree hole
|
Fig.14.2
Postprocessing of
hemispherical shell
with 18 degree hole
|
|
|
|
|
|
|
Example
: The solution of a simply supported
rhombic plate subjected to a
uniformly distributed load is
presented. The numerical results
of plate center deflection are
presented in Table. The reference
solution is W c =0.04455. Good
result is obtained from the
present elements.
|
| 
|
|
|
|
|
|
Table
Results of rhombic plate
(W=0.04455)
|
|
|
|
Element
Size
|
Normalized
Solutio
|
|
XSOLID81
|
XSOLID82
|
XSOLID83
|
XSOLID84
|
XSOLID85
|
XSOLID8F
|
|
4*4*1
|
0.8790
|
0.9464
|
0.8745
|
0.8790
|
0.3203
|
0.0215
|
|
8*8*1
|
0.8705
|
0.9535
|
0.8649
|
0.8705
|
0.6763
|
0.0715
|
|
16*16*1
|
0.9273
|
0.9856
|
0.9246
|
0.9273
|
0.8889
|
0.1832
|
|
20*20*1
|
0.9475
|
0.9960
|
0.9452
|
0.9475
|
0.9299
|
0.2325
|
|
32*32*1
|
0.9852
|
1.0146
|
0.9832
|
0.9852
|
0.9868
|
0.3528
|
|
|
|
|
|
| 
Bond-slip behaviour of Basemnet of Pylon
in cable stayed bridges
|
|
|
|
|
| 
|
|
|
|
<
Figure 3D modeling of reinforicing
bar and concrete in basement
of pylon >
|
|
|
|
|
|
|
| 
|
|
<
Figure Bond-slip behaviour of
reinforicing bar and concrete in basement of pylon
> |
|
|
|
|
