International Scientific-Technical and Production Journal
April
2012
# 4
English translation of the monthly «Avtomaticheskaya Svarka» (Automatic Welding) journal published in Russian since 1948
Editor-in-Chief B.E.Paton
Yu.S.Borisov V.F.Khorunov
A.Ya.Ishchenko I.V.Krivtsun
B.V.Khitrovskaya L.M.Lobanov
V.I.Kyrian A.A.Mazur
S.I.Kuchuk-Yatsenko
Yu.N.Lankin I.K.Pokhodnya
V.N.Lipodaev V.D.Poznyakov
V.I.Makhnenko K.A.Yushchenko
O.K.Nazarenko A.T.Zelnichenko
I.A.Ryabtsev
CONTENTS
SCIENTIFIC AND TECHNICAL
. and
. and
N.P.Alyoshin (Russia)
U.Diltey (Germany)
Guan Qiao (China)
D. von Hofe (Germany)
V.I.Lysak (Russia)
N.I.Nikiforov (Russia)
B.E.Paton (Ukraine)
Ya.Pilarczyk (Poland)
G.A.Turichin (Russia)
Zhang Yanmin (China)
A.S.Zubchenko (Russia)
V.N.Lipodaev, V.I.Lokteva
A.T.Zelnichenko (exec. director)
A.A.Fomin, O.S.Kurochko,
I.N.Kutianova, T.K.Vasilenko
N.A.Dmitrieva
D.I.Sereda, T.Yu.Snegiryova
. and
.
Heat-protecting properties of thermal spray coatings
containing quasi-crystalline alloy of the Al—Cu—Fe
system ................................................................................... 31
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© PWI, International Association «Welding», 2012
. and
. Fields
.
Capacitor-discharge stud welding in vacuum ........................... 37
. and
of application of magnetic-pulse welding (Review) ................... 42
. Equipment for heat treatment of
welded joints on pipelines ....................................................... 47
Theory and technology of submerged-arc welding ................... 51
News ............................................................................... 19, 50
. and
. Experimental
review of the welding metallurgy of high-strength
aluminium alloy 7025-T6 ......................................................... 20
. Calculation
of local stresses in welded joint zones of large-sized
space structures ..................................................................... 2
. Electron beam
welding of thick-wall shells of aluminium AMg6 and
M40 alloys .............................................................................. 6
. and
. Vacuum diffusion welding of γ-TiAl
intermetallic alloy to 12Kh18N10T steel ................................... 12
. and
. Laser welding of sheet stainless steel by
modulated radiation ................................................................ 15
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Bovkun V.A
Стр.1
CALCULATION OF LOCAL STRESSES IN WELDED JOINT
ZONES OF LARGE-SIZED SPACE STRUCTURES
V.I. KYRIAN, V.I. DVORETSKY and M.G. MALGIN
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
An approach to calculation of local stresses in zones of welded joints on structures has been developed. The approach is
based on introducing absolutely rigid bodies (ARB) in the form of plane sections into the calculation model. According
to plane section hypothesis, ARB provides an adequate transfer of external force effects from one fragment model to
another, and permits local distribution of stresses in the zones of the welded joints to be investigated, taking into account
the 3D work of the entire structure, thus providing a qualitatively new tool to allow for service loading of elements in
evaluation of fatigue life.
Keywords: large-sized space structures, welded joints, local
stresses, finite-element method, finite-element model, absolutely
rigid body, calculation
At determination of the level and repeatability of
stresses in welded connections it is highly important
to take into account the 3D work of the structure.
The main method of 3D analysis of the stress-strain
state (SSS) of structural connection and elements is
the finite-element method (FEM) which allows approximating
any deformed body by a model, consisting
of a certain type of finite elements (FE). In mathematical
terms calculation is reduced to solving a system
of equations of equilibrium, consistency of deformations
and physical equations.
At calculation evaluation of welded connection SSS
it is necessary to adequately reflect the nature of element
interaction in structural stress raiser zones with welded
joint geometry. Therefore, it is necessary to approximate
the entire structure by 3D FE. It is extremely
difficult to perform calculations with such a detailed
approximation of all the components and elements.
Such calculations require application of high-power
computers and are performed in exceptional cases. In
common engineering practice calculation of local
stresses in welded connections of metal structures of
industrial buildings and engineering constructions is
related to their separation into individual fragments
and stage-by-stage analysis of SSS [1]. The welded
structure is first considered as a rod model with specified
loads and fastening conditions. Then a fragment
with the studied welded connection is separated from
the rod model of the entire structure and it is represented
as shell FE. After calculation of a fragment
from shell FE, the welded connection is separated
from it, and is represented by 3D FE. Calculation of
the latter gives volume distribution of SSS of each
structural element present in it. In such cases, basic
and quite difficult to implement is the need to establish
at transition from one calculation model of a fragment
to another one (with a more complex approximation),
the boundary conditions in the form of nodal
ties and external force impacts derived in calculation
of previous fragment SSS. The complexity is increased
in the case of structure operation under alternating
© V.I. KYRIAN, V.I. DVORETSKY and M.G. MALGIN, 2012
2
loading, leading to a change of the nature of interaction
of structural elements of welded connections. In
order to adequately represent the influence of external
alternating impacts on SSS in the analyzed points of
welded connection at different loading schematics, it
is necessary to develop new boundary conditions for
each calculation model of a fragment. This makes it
more difficult to perform structure design, and analysis
of the level and nature of stress variation in individual
elements of welded connection at the same
initial conditions (specifying the design characteristics,
design loads and their comparison criteria).
At the same time, in calculations of building structures,
in particular, concrete, such an FE as an absolutely
rigid body (ARB) is used, which allows creating
a rigid constraint between models of fragments, consisting
of various FE types [2, 3]. It is used for transfer
of information on SSS from one part of structure model
to another one. Used as ARB is one of the structural
(connecting) elements, as a result of which the entire
structure is considered as one calculation model. The
idea of ARB application in the form of structural
elements is quite good and well-proven at rather simple
forms of transition: combining the model of a
column of industrial buildings with the model of covering
plate from plate FE; combining rod models of
ribs of bridge structure beams with the roadway slab
from plate FE, etc. At evaluation of welded connection
SSS, however, it is difficult to apply ARB in the form
of a structural element, as the transition itself (welded
connection) should be analyzed.
As deformation of welded structure stressed elements
quite satisfactorily obeys the plane-section hypothesis,
at each transition from one calculation model
of a fragment to another one, it is the most rational
to introduce ARB not in the form of a structural element,
but as plane ARB – section of structural element
of the next model. If certain conditions of interaction
of ARB in the form of a plane section with
fragment models are followed, it is believed to be
possible to perform, using FEM, calculations of local
stresses in welded connections of structures of any
degree of complexity, adequately transferring hereditary
information about SSS from one calculation
model to another one, allowing for the loading fea4/2012
Стр.2