Galvanized Pipe DN50 Galvanized Steel Pipe DN100 Galvanized Large Diameter Pipe DN300-DN600 Seamless Steel Pipe
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Galvanized Pipe DN50 Galvanized Steel Pipe DN100 Galvanized Large Diameter Pipe DN300-DN600 Seamless Steel Pipe
Local thinning is a common defect of elbow, but the domestic and
foreign researches on this kind of defect mainly focus on straight
pipe, and there are few literature reports on local thinning of
elbow. Through detailed finite element calculation and theoretical
analysis, this paper studies the internal pressure and bending
moment under the action of the local thinning to bend the influence
of ultimate bearing capacity, as well as the internal pressure
under the action of many local thinning the mutual interference
effect and under the action of bending moment of straight pipe to
elbow limit load of strengthening effect, and some experimental
verification, get the following results:
1. Using the finite element method under the action of internal
pressure limit load of local thinned elbow has carried on the
systematic analysis and calculation, it is concluded that the local
thinned elbow ultimate pressure is different from local thinning of
the straight pipe, elbow of extreme pressure not only depends on
the size of the local thinning, also associated with local thinned
position and bending radius, such as using the calculation method
for the evaluation of local thinned straight pipe elbow, Results
may be unsafe or too conservative; At the same time, the influence
of thinning width on ultimate load cannot be ignored. Based on the
finite element analysis, the formula for calculating the ultimate
pressure of local thinning elbow is given. The results of the
formula are in good agreement with the finite element calculation
and experimental results, and are safe. The formula can be applied
to the safety assessment of local thinning elbow, which complements
the blank of this research.
2. Through finite element analysis, the mutual interference effect
of multi-local thinning under internal pressure is studied. The
study shows that the mutual influence of multi-local thinning is
not only related to the spacing, but also to the thinning depth. It
is pointed out that when the thinning depth is shallow, the axial
local thinning spacing is greater than 2 times of wall thickness,
and the ultimate load of double local thinning is basically the
same as that of single local thinning. When the thinning depth is
deep and the axial local thinning spacing is greater than 4 times
the wall thickness, the ultimate load of double local thinning is
basically the same as that of single local thinning, which
complements the deficiencies of existing studies.
3. Through finite element calculation, the strengthening effect of
connected straight pipe on the ultimate bending moment of elbow is
studied, and it is pointed out that the ultimate bending moment of
elbow increases with the straight pipe connected to elbow, and the
ultimate load increases with different bending radius. When the
length of connected straight pipe is more than 3 times of pipe
diameter, the strengthening effect of straight pipe on elbow is no
longer increased. This study complements the deficiency of the
research on strengthening effect of straight pipe on elbow.
4. The influence of local thinning on the ultimate bending moment
of the elbow is studied in detail by finite element analysis. It
can be concluded that the ultimate bending moment of the local
thinning elbow under the action of internal bending moment is
related to the thinning position, the thinning size and the bending
radius. The results show that the influence of geometric
nonlinearity is significant under bending moment. Based on the
finite element analysis of the local thinning of the inner wall and
large deformation, the formula for calculating the ultimate bending
moment of the local thinning elbow under the action of the internal
bending moment is given. The calculated results can reflect the
finite element calculation results accurately and conservatively,
and agree with the experimental results. This study fills in a gap
in the field.
Galvanized Pipe DN50 Galvanized Steel Pipe DN100 Galvanized Large Diameter Pipe DN300-DN600 Seamless Steel Pipe
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