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(with
special reference to welded structures)
Organized by
Stefan Vodenicharov
Address:
67 Shipchensky prohod
Str., 1574
Phone: X-359 2 973 39 70, FAX: X-359 2 973 39 70 E-mail: stvims@ims.bas.bg
and
Stojan Sedmak
Address: Society for Structural Integrity and Life (DIVK)
Bulevar vojvode Mišića 43 (room
258), 11000
Phone: X-381-11-2650322ext.202, FAX: X-381-11- E-mail: Sedmak@divk.org.yu
Symposium
Chair: Donka Angelova
Address:
8, Kliment Ohridsky,
Blvd, 1156
Phone: X-359 2 6254 362 FAX: X-359 2 685 488 E-mail:
dona_angelova@techno-link.com
Symposium Co-chair: Dragoslav Šumarac
Description:
The
achievement of fracture mechanics in definition of crack parameters, followed
by development of standards for crack parameters testing, enabled the basic
approach to structural integrity assessment. Starting with brittle fracture and
plane fracture toughness, KIc, structural
integrity assessment developed in most important service condition:
-
overloading and stable crack growth parameter in the form of COD or J
integral,
-
variable loading and stress intensity factor range, DK,
-
high temperature and Ct and C* integral,
-
hostile environment and stress corrosion cracking
parameter KIscc.
Practical
application of developed parameters is followed by many problems, like stress
state determination and stress concentration, microstructural
defects, irregular loading sequence, stable crack growth, combined with
limitation in non-destructive testing and data of service history. In the case
of welded structure the situation is more complicated due to welded joint
heterogeneity in microstructure and mechanical properties in heat-affected-zone
and in weld metal, residual stresses, imperfections induced by welding and welded
joints quality. Presentation of case studies and explanation of failure causes
will help better understanding of the problem and increase of structural
integrity.
Papers:
A. Authors from
1. Problems and Application of Fracture
Mechanics for the "Fitness for Purpose" of Weldments,
by Schelev
Al and N. Lolov
2. Investigations on Pressure Vessel Embritlement of Reactors WWER1000, by
3. An Electrochemical Kinetics Approach to the
Stress-Corrosion Cracking of Metals, by Raicheff R.
4. An Alternative Approach to Fatigue Data
Presentation, by Angelova D.
5. Predictions of Damage and Durability under
Cyclic Loading, by Hadjov Kl., D. Dontchev
6. Nanomaterials and
Nanostructures: State-of-the-art, Challenges and Achievements, by
Kothukharov Vl.
7. Modelling Damage in Crystalline Nanomaterials,
by Baltov A.
8. Synthesis, Structure and Properties of Hybrid Nanocomposites with Strong Chemical Bonds, by Samuneva B.
9. On Behaviour of Nanocomposite Materials, by Ivanov Y
10. Strenthening of Nanocomposites with Metal Particles,
by Dragieva I.
11. Influence of neutron irradiation on partition
impact fracture energies of reactor pressure vessel steel
by Svetoslava
Petkova
Phone: +359(2)
7142335, FAX: +359(2) 9733970 E-mail: sv_petkova@yahoo.com
12. Investigation of fracture mechanisms of high
nickel WWER 1000 weld metal under three point impact
loading
by
Phone: +359(2)
7142373, FAX: +359(2) 9733970 E-mail: nemak@gbg.bg
13. Assessment of dynamic fracture toughness of
reactor steels by using sub-sized specimens
by Martin Lolov
Phone:+359(2) 7142373 FAX:+359(2) 9733970 E-mail: oldmarti@mail.bg
14. Fracture toughness determination of reactor
pressure vessel steel
by Pavel Eskenazi
Phone:
+359(2) 7142545, FAX: +359(2) 9733970 E-mail: eskenazi@bigfoot.com
B. Authors from
1. Risk based integrity assessment of concrete structures, by Miodrag Pavišić
2. Optizimation of design shapes of welded joints, by
Božidar Rosić
3. Structural integrity assessment by local approach
to fracture, by Miodrag Zrilić
4. New approach for determination of resistance curve, by
Blačic Ivo and Grabulov Vencislav
5. The effect of loading rate on
fracture resistance of high strenth steel welded joints,
by V. Grabulov and
6. Structural integrity at elevated temperatures –
residual service life evaluation,
by Ljubica Milović
7. Theoretical and experimental analysis of satelite
holder welded structure in planetar gear box, by Miodrag
Arsić
8. Fracture in medium carbon V-microalloying
steel, by N. Radović and Drobnjak, H. Hraam
9. Some aspects of engineering approach to structural integrity
assessment, by Kirić Miodrag and Sedmak
Aleksandar
10. Structural integrity assessment by ultrasonic testing (and fracture
mechanics), by Kirić Miodrag
11. Crack initiation and growth in heat-affected-zone of microalloyed steel, by Katarina Gerić and Stojan Sedmak
12. The significance of crack-like defect on in-service behavior of
tubes produced of microallozed steel 7, CrMoVTiBo, by Z. Burzić, J. Kurai, N. Garić, J. Pecha, M. Zrilić
13. Monitoring of stress and strain state of boiler tubes during proof pressure
test, by Kurai, Z. Burzić, N. Garić, M. Zrilić, B. Aleksić
14. The effect of welding procedure of microalloyed
steel on fatigue crack growth,
by Z. Burzić,
15. Fracture resistance of high-strength
7000 forging alloys, by Z.Cvijovic, M.Rakin, M.Vratnica
Aleksandar Kojović
Faculty of Technology and Metallurgy,
Irena Živković, Ljiljana Brajović, Radoslav Aleksić, Dragan Mitraković
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