Abstracts
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| Datum: | 2014 |
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Інститут проблем міцності ім. Г.С. Писаренко НАН України
2014
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| Schriftenreihe: | Проблемы прочности |
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| Zitieren: | Abstracts // Проблемы прочности. — 2014. — № 4. — С. 172-174. — англ. |
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irk-123456789-1731342020-11-23T01:26:36Z Abstracts 2014 Article Abstracts // Проблемы прочности. — 2014. — № 4. — С. 172-174. — англ. 0556-171X http://dspace.nbuv.gov.ua/handle/123456789/173134 en Проблемы прочности Інститут проблем міцності ім. Г.С. Писаренко НАН України |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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English |
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Article |
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Abstracts |
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Abstracts Проблемы прочности |
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Abstracts |
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Abstracts |
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Abstracts |
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Abstracts |
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abstracts |
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Інститут проблем міцності ім. Г.С. Писаренко НАН України |
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2014 |
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http://dspace.nbuv.gov.ua/handle/123456789/173134 |
| citation_txt |
Abstracts // Проблемы прочности. — 2014. — № 4. — С. 172-174. — англ. |
| series |
Проблемы прочности |
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2025-07-15T09:40:13Z |
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2025-07-15T09:40:13Z |
| _version_ |
1837705371276279808 |
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Troshchenko V. T. and Khamaza L. A.
Conditions for the Transition from
Nonlocalized to Localized Damage in Metals
and Alloys. Part 2. Duration of Fatigue
Crack Initiation and Propagation Stages //
Problems of Strength. – 2014. – No. 4. – P. 5–
20.
A ratio between the durations of fatigue crack
initiation and propagation stages is analyzed tak-
ing into account the influence of crack sizes cor-
responding to the crack initiation, the presence
of local damages on the specimen surface, the
scatter of test results, the stress concentrators,
the type of stress state, and other factors. The ap-
proaches to identifying the conditions for a tran-
sition from dispersed to localized damage are
discussed; the paper gives the results of investi-
gation of these conditions, which is based on an
analysis of cyclic inelasticity characteristics of
metals and alloys versus the number of loading
cycles and the rate of propagation of short fa-
tigue cracks depending on the range of stress in-
tensity factor.
Matveev V. V. and Boginich O. E. The
Influence of Inelastic Resistance on Vibro-
diagnostic Parameters of the Presence of a
Closing Crack in an Elastic Body under
Superharmonic Resonance // Problems of
Strength. – 2014. – No. 4. – P. 21–35.
The authors discuss the methods for approxi-
mate determination of vibrodiagnostic parame-
ters of the presence of a closing mode I fatigue
crack in an elastic body taking into account vari-
ous types of inelastic resistance under second-or-
der superharmonic resonance.
Strizhalo V. A., Novogrudskii L. S., and
Opravkhata N. Ya. On the Critical State of
M76 Pearlite Steel under Action of Electric
Current // Problems of Strength. – 2014. –
No. 4. – P. 36–42.
A new criterion for assessment of the critocal
state of rail steel subjected to electric current
pulses is proposed and substantiated. As the criti-
cal state criterion we propose to use the condi-
tion of equality of the conventional yield stress
of the material after cycling operation with fur-
ther action of electric current pulses and the min-
imal yield strees regulated by the respective
standards.
Stepanov G. V. and Mameev I. A. Durability of
a Stress Concentrotor-Containing Cantilever
Beam under Cyclic Loading in Bending //
Problems of Strength. – 2014. – No. 4. – P. 43–
49.
The procedure and results of studies on the dura-
bility of the cantilever beam metal over the
stress concentrator area in pulsed cyclic bending
are presented. Comparison of experimental and
numerical simulation data resulted in establish-
ing the relation between the durability and in-
elastic cyclic deformation amplitude the effect
of strain hardening and plastic strain rates on
durability was elucidated.
Shul’zhenko N. G., Gontarovskii P. P., and
Protasova T. V. Influence of the Circumferential
Non-Uniformity in the Material Mechanical
Properties on the Deformation of Rotors of
Power-Generating Units // Problems of Strength.
– 2014. – No. 4. – P. 50–61.
The paper considers the irreversible deformation
of steam turbine rotors due to the circumfer-
ential non-uniformity of the material mechani-
cal properties based on the numerical analysis
of their three-dimensional stress-strain state. It
is shown that this non-uniformity can be one of
the causes for the occurrence and development
of progressive creep deflection of high-tempera-
ture rotors that have been in long-term operation
and also their bending in case of excess of the
rated rotational speed.
Savchenko K. V., Zinkovskii A. P., Tokar’ I. G.,
and Kruglii Ya. D. Effect of Contact Surface
Orientation of End-Winding Shelves on
Static Stressed State of Operating Turbine
Blades // Problems of Strength. – 2014. – No. 4.
– P. 62–72.
We provide the numerical simulation results on
the variation of characteristics of static stressed
state of turbine blades versus inclination angle
of shelves’ contact surfaces to the rotation plane
of the blade wheel with account of action of the
field of centrifugal forces and high temperatures
of the gas flow.
Bobyr’ N. I., Babenko A. E., Lavrenko Ya. I.,
and Khalimon A. P. Durability of Centrifuge
Structural Components with Account of
Their Damageability // Problems of Strength. –
2014. – No. 4. – P. 73–83.
Abstracts
172 ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 4
We propose a new technique for calculation and
assessment of the current state of heavy-duty
structural elements under low-cycle fatigue in
view of the operating mode specific features.
The technique is based on the concept of dis-
persed damageability and the account of dam-
age parameter in the system of governing
equations on example of high-speed rotating
components of laboratory centrifuges. Macro-
and microstructural analyses of the material are
performed , as well as static and cyclic tests of
7075 (V95) aluminum alloy. The results of ex-
perimental studies are compared with theoretical
calculations by the finite element method via
the ANSYS software package.
Muzyka N. R. and Shvets V. P. Determination of
Stresses and Strains in Elastoplastic Deformed
Body from Hardness Characteristics //
Problems of Strength. – 2014. – No. 4. – P. 84–
91.
The paper considers the possibility of determin-
ing stresses and strains in elastoplastic deformed
body from hardness spreading parameters.
Sajikumar K. S., Asok Kumar N., and
Nageswara Rao B. Application of the Point
Stress Criterion to Assess the Bond Strength
of a Single-Lap Joint // Problems of Strength. –
2014. – No. 4. – P. 92–101.
Finite element analysis has been carried out to
obtain the interfacial stresses in a single lap
joint using a special 6-node isoparametric ele-
ment for adhesive layer. The analysis results are
found to be in good agreement with the closed-
form solution of Goland and Reissner. The peak
normal and shear stresses found in the adhesive
layer at the edges of the joint are due to stress
singularity. The bond strength of the single-lap
joint is estimated considering one of the stress
fracture criteria known as the point stress crite-
rion. Bond strength estimates are found to be rea-
sonably in good agreement with existing test
results.
Li Y. Development of Strength and Yield
Criteria Based on the Relationship between
Elastic and Plastic Strains // Problems of
Strength. – 2014. – No. 4. – P. 102–108.
The presented research results imply a certain re-
lationship between elastic and plastic parts of
strain. Based on the preliminary summary of
this relationship, a new strength criterion is pro-
posed, which can be treated as modification of
the maximum principal strain criterion. Since
the proposed approach establishes a relationship
between strength and yield criteria, it can also
be treated as a new yield criterion.
Torabi H. and Shariati M. Buckling Analysis of
Steel Semi-Spherical Shells with Square
Cutout under Axial Compression // Problems
of Strength. – 2014. – No. 4. – P. 109–122.
Buckling of steel thin walled semi-spherical
shells with square cutout due to axial compres-
sive loads has been studied by numerical simula-
tions, and results were compared with those
from the experiments. Three vertical compres-
sion loadings were applied to specimens using
the following methods: a rigid flat plate and a
rigid bar with circular and spherical cross sec-
tions. The main aim of this study is to determine
the influence of the cut out size-to-location
(a/H) and the thickness-to-diameter (t/D) on the
mean collapse load of the semi-spherical shells.
The finite element models were analyzed using
ABAQUS nonlinear buckling analysis and the
experimental tests were performed using an
INSTRON 8802 servo-hydraulic machine. Fi-
nally, the different results obtained using the
two analysis methods were compared. The com-
parison reveals that experimental and numerical
nonlinear model results match closely with each
other.
Mokaddem A., Alami M., Doumi B., and
Boutaous A. Prediction by a Genetic
Algorithm of the Fiber–Matrix Interface
Damage for Composite Material. Part 1.
Study of Shear Damage in Two Composites
T300/914 and PEEK/APC2 // Problems of
Strength. – 2014. – No. 4. – P. 123–129.
We have conducted research on the effect of fi-
ber arrangement on the optimization of the dam-
age to the interface, recently published. We
develop in this paper the evolution of the dam-
age in the shearing direction by genetic algo-
rithm. The results obtained by varying the shear
rate of the interface of the two materials studied
T300 and PEEK, show a good agreement be-
tween our genetic approach and the mathemati-
cal models presented by Cox and Weibull.
Mokaddem A., Alami M., Ziani N., Beldjoudi N.,
and Boutaous A. Prediction by a Genetic
Algorithm of the Fiber–Matrix Interface
Damage for Composite Material. Part 2.
Study of Shear Damage in Graphite/Epoxy
Nanocomposites // Problems of Strength. –
2014. – No. 4. – P. 130–135.
Abstracts
ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 4 173
The objective in this paper is to apply the same
genetic model as applied in Part 1 to optimizing
the shear damage to the fiber–matrix interface
of nanocomposite material graphite epoxy. The
results show good agreement between the nu-
merical simulation and the actual behavior of
the material chosen composite and
nanocomposites, and these results are similar to
results obtained by processing techniques ex-
panded graphite reinforced polymer nanocom-
posites made by Asma Yasmine. These results
were confirmed by calculating the rate of dam-
age with a genetic simulation.
Levchuk S. A. Application of Potential Theory
Methods for Static Deformation Studies on
Sectional Cone Shells // Problems of Strength.
– 2014. – No. 4. – P. 136–141.
The static deformation problem for cone shells
is examined. The solution is built on potential
theory methods. An examined body is treated as
the sectional structure, including several cone
shells. The conditions of shell connection in the
sectional structure are formulated. For the exam-
ined problem, the Green-type matrix is con-
structed. Basic stress state characteristics of a
sectional cone shell in relation to cone angles
are investigated.
Shvab’yuk V. I., Rotko S. V., and Uzhegova O. A.
Bending of a Composite Beam with a
Longitudinal Cut // Problems of Strength. –
2014. – No. 4. – P. 142–151.
Within the framework of the composite beam
theory, an analytical solution is obtained for a
beam with a longitudinal cut, which is collinear
to its median line. The beam bending loading re-
sults in the cut opening. The elementary formu-
las for stresses and displacements of all beam
sections are derived. The accuracy of the results
obtained is confirmed by their comparison with
the respective data derived by solving the elastic
theory plane problem by the method of
boundary elements.
Bazhenov V. A., Luk’yanchenko O. O., Kostina
O. V., and Gerashchenko O. V. Probabilistic
Approach to Reliability Assessment of the
Imperfect Shell Support // Problems of
Strength. – 2014. – No. 4. – P. 152–161.
A probabilistic approach to reliability assess-
ment of the imperfect cyclindrical shell support
by stability is proposed. The nonlinear resis-
tance of the shell is assessed, in view of its im-
perfect geometry, under action of combined
loading. The critical load combination surface is
constructed and the stable zone is specified. The
reliability by strength is calculated with account
of different types of distribution of the imperfec-
tion probability density and its preset maximal
value using the obtained reliability surface. The
acceptable combinations of combined loads are
obtained, which should be taken into account in
the design and operation calculations of the
shell support under study.
Semegen O. M., Odosii Z. M., and Kustov V. V.
Study and Simulation of the Effect of Design
and Technological Parameters of Toothed
Roller Bits on Wear Resistance of Their
Tipped Cladding Surfaces // Problems of
Strength. – 2014. – No. 4. – P. 162–171.
For assessment of the effect of design and tech-
nological parameters of toothed roller bits on
wear resistance of their tipped cladding surfaces
during the drilling process, tests on a specially
developed bench are performed. Based on the
test results, mathematical models are obtained,
which describe the effect of these parameters on
wear characteristics of tipped teeth surfaces of
the toothed roller bits produced by various clad-
ding schemes. It is shown that the optimal clad-
ding scheme is provided by using the “relite”
tungsten carbide-based powder and a larger clad-
ding area by the tooth width.
Abstracts
174 ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 4
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