Proceedings of 10th International Conference ITELMS’2015
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J. Smith *, K. Manier ** Bold 12pt
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*Kaunas University of Technology, Donelaičio str. 17, 44239, Kaunas, Lithuania, E-mail: smith@ktu.lt 10pt
**Kaunas University of Technology, Vytauto av. 3, 44354, Kaunas, Lithuania, E-mail: manier@ktu.lt
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Abstract 10pt
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The paper presents an investigation of fracture toughness of steam pipelines Ду-300 in Ignalina NPP. Main metal steel
0X18H10T, weld metal welded by manual arc method using electrodes ЭА-100/10У or ЭА-100/10T, manual or
automatic welding with wire Cв-0419H11M3 (TIG method) and heat treatment zone metal specimens was tested and
crack resistance curves was determined. 10pt
KEY WORDS: fracture toughness, weld metal, welded joint metal, heat treatment zone metal. 10pt
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1. Introduction 10pt
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The program of the conference is intended to be published on Web page of KTU. The authors are requested to
submit the manuscript (not exceeding six pages), summary and the presentation title (in English, up to 600 characters)
before April 15, 2011 by E-mail as an attached file.
The article should be prepared using Microsoft Word XP for Windows. The font for English text should be
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Table 1.
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Title
Authors
Organization address
Abstract
Key words
Other text
References
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1. Testing procedure of curve is described in the American standard ASTM E1152-87 [1]. In the majority of
tests compact specimens C(T) for ten-sion or B(T) for bending are applied.
2. The procedure of precracking in details is described in [2,3]. The elastic compliance method using remote
load line displacement measurements to de-velop J-R curve was carried out on a 250 kN tension -compression testing
ma-chine, the loading speed during unloading - reloading cycle was taken about 40 seconds [4].
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Fig. 2. Page size setup
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Proceedings of 10th International Conference ITELMS’2015
Basic sizes of specimens B and W-а should exceed the size of plastic zone in advance of a developing crack
minimum 50 times, otherwise the incorrect characteristics of fracture toughness will be received. Sizes of the test
specimens depend on the thickness of material, from which they are made. Specimens of the size 1/2T and 1T have
been used in our test, because the diameter of steam pipes from which they were made is 300 mm and 630 mm, and the
thickness of walls – 15 mm and 27 mm.
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2. Testing Procedures
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All specimens were cyclically precracked on testing machine YPC-200 at loading frequency 16 - 20 Hz at load
values. For C(T) specimens:
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0.4 Bb02 σ Y
PM 
.
(1)
2W  a
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where b0  W  a0
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500
500
3
J,
kN/m
400
2
Jmax
300
200
200
4
JQ
100
9 or 10 pt
Italic
5 or 6 pt
1
00

 c, mm 3



0
0.5
1 
1.5 max22 a2
.5
3
Fig. 3. Page J-R curve for steel 16GS at T=285oC, crack limits and the exclusion line: 1, 2, 3 - experimental results: 4 theoretical curve.
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In order to account the crack opening displacement in C(T) specimens for its rotation compliance was
corrected, new values of J i and ai were calculated and J  R curves J i versus ai were plotted.
An example of calculated J  R curve at T=285oC for specimen cut from pipe DU-630 steel 16GS. Averaged
J-R curves for welded specimens in series cut from pipe DU-300 at normal and elevated (T=285oC) temperature. These
equivalent parameters are given in Table.1.
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3. Conclusions
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Fracture toughness research has shown that side grooves on the specimens are necessary to receive straight
crack front and initial ratio 0.55  a0 W  0.65 is preferable to give excellent sensivity of compliance measurement.
Comparison of J  R curves using two methods has shown that J 1C integral values for all investigated metals
are similar, except steel 16GS at normal ( J1C20
0
C
  125 kN/m), elevated ( J 2850 C   59 kN/m) temperature and pipe’s
1C
DU-300 weld metal ( J 1C20 C   109 kN/m) and varies from 73 to 88 kN/m.
Maximum K1C values were for steel 08X18H10T, its weld and steel 16GS at normal temperature
0
( K1C20 C   142.3 - 162.3 MPa m ), minimum – for steel 08X18H10T at elevated (285oC) temperature ( K1C285
0
0
C
  96.4
MPa m ). For other metals temperature of testing has not significant influence on K1C values and were in the
range K1C =109.1 - 131.8 Pa m .
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Proceedings of 10th International Conference ITELMS’2015
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References
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1. Standard Test Method for Determining J-R Curves. ASTM E1152-87.-11p.
2. J. Smith, J. Smith.. Ignalinos VAE garotiekio vamzdžio Ду-630 suvirinto sujungimo medžiagų J  R kreivių tyrimas.Mechaninė technologija.-Kaunas: Technologija, 1999, t.XXVII, p.182-199.
3. Standard Test Method for J IС , a Measure of Fracture Toughness, Philadelphia, ASTM E813-87.-600p.
4. Anderson, T.L.. Fracture Mechanics. Fundamentals and Applications.-Boca Raton, Ana Arbor:- CRC Press,
1991.-793p..
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