Finite-element pre-analyses for pressurized thermoshock tests

Vessel I: Tests 4, 5 and 6

Heikki Keinänen, Heli Talja, Mikko Lehtonen, Rauno Rintamaa, Ralf Ahlstrand, Pekka Nurkkala, Pentti Rajamäki, Alexander Bljumin, Boris Timofeev

Research output: Book/ReportReportProfessional

Abstract

The behaviour of a model pressure vessel is studied in a pressurized thermal shock loading. The tests were performed at the Prometey Institute in St. Petersburg. The calculations were performed at the Technical Research Centre of Finland. This report describes the preliminary finite- element analyses for the fourth, fifth and sixth thermoshock tests with the first model pressure vessel. Seven pressurized thermoshock tests were made with the same model pressure vessel using five different flaw geometries. In the first three tests the flaw was actually a blunt notch. In the two following tests (tests 4 and 5) a sharp pre-crack was produced before the test. In the last two tests (tests 6 and 7) the old crack was used. According to the measurements and a post-test ultrasonic examination of the crack front, the sixth test led to significant crack extension. Both temperatures and stresses were calculated using the finite- element method. The calculations were made using the idealized initial flaw geometry and preliminary material data. Both two- and three-dimensional models were used in the calculations. J-integral values were calculated from the elastic-plastic finite-element results. The stress intensity factor values were evaluated on the basis of the calculated J-integrals and compared with the preliminary material fracture toughness data obtained from the Prometey Institute. When the calculated temperatures, strains and crack opening displacements are compared to measured values, a sufficient agreement is observed. The calculated stress intensity factor exceeds the preliminary material fracture toughness value and thus crack initiation is predicted.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages39
ISBN (Print)951-38-4221-5
Publication statusPublished - 1992
MoE publication typeNot Eligible

Publication series

NameVTT Publications
PublisherVTT
No.103
ISSN (Print)1235-0621
ISSN (Electronic)1455-0849

Fingerprint

Cracks
Pressure vessels
Stress intensity factors
Defects
Fracture toughness
Geometry
Thermal shock
Crack initiation
Ultrasonics
Plastics
Finite element method
Temperature

Keywords

  • pressure vessels
  • model tests
  • thermal shock
  • finite element analysis
  • temperature
  • pressurizing
  • stresses
  • thermal stresses
  • cracking (fracturing)
  • crack propagation
  • crack initiation
  • calculations

Cite this

Keinänen, H., Talja, H., Lehtonen, M., Rintamaa, R., Ahlstrand, R., Nurkkala, P., ... Timofeev, B. (1992). Finite-element pre-analyses for pressurized thermoshock tests: Vessel I: Tests 4, 5 and 6. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 103
Keinänen, Heikki ; Talja, Heli ; Lehtonen, Mikko ; Rintamaa, Rauno ; Ahlstrand, Ralf ; Nurkkala, Pekka ; Rajamäki, Pentti ; Bljumin, Alexander ; Timofeev, Boris. / Finite-element pre-analyses for pressurized thermoshock tests : Vessel I: Tests 4, 5 and 6. Espoo : VTT Technical Research Centre of Finland, 1992. 39 p. (VTT Publications; No. 103).
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Keinänen, H, Talja, H, Lehtonen, M, Rintamaa, R, Ahlstrand, R, Nurkkala, P, Rajamäki, P, Bljumin, A & Timofeev, B 1992, Finite-element pre-analyses for pressurized thermoshock tests: Vessel I: Tests 4, 5 and 6. VTT Publications, no. 103, VTT Technical Research Centre of Finland, Espoo.

Finite-element pre-analyses for pressurized thermoshock tests : Vessel I: Tests 4, 5 and 6. / Keinänen, Heikki; Talja, Heli; Lehtonen, Mikko; Rintamaa, Rauno; Ahlstrand, Ralf; Nurkkala, Pekka; Rajamäki, Pentti; Bljumin, Alexander; Timofeev, Boris.

Espoo : VTT Technical Research Centre of Finland, 1992. 39 p. (VTT Publications; No. 103).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Finite-element pre-analyses for pressurized thermoshock tests

T2 - Vessel I: Tests 4, 5 and 6

AU - Keinänen, Heikki

AU - Talja, Heli

AU - Lehtonen, Mikko

AU - Rintamaa, Rauno

AU - Ahlstrand, Ralf

AU - Nurkkala, Pekka

AU - Rajamäki, Pentti

AU - Bljumin, Alexander

AU - Timofeev, Boris

N1 - Project code: MET001611

PY - 1992

Y1 - 1992

N2 - The behaviour of a model pressure vessel is studied in a pressurized thermal shock loading. The tests were performed at the Prometey Institute in St. Petersburg. The calculations were performed at the Technical Research Centre of Finland. This report describes the preliminary finite- element analyses for the fourth, fifth and sixth thermoshock tests with the first model pressure vessel. Seven pressurized thermoshock tests were made with the same model pressure vessel using five different flaw geometries. In the first three tests the flaw was actually a blunt notch. In the two following tests (tests 4 and 5) a sharp pre-crack was produced before the test. In the last two tests (tests 6 and 7) the old crack was used. According to the measurements and a post-test ultrasonic examination of the crack front, the sixth test led to significant crack extension. Both temperatures and stresses were calculated using the finite- element method. The calculations were made using the idealized initial flaw geometry and preliminary material data. Both two- and three-dimensional models were used in the calculations. J-integral values were calculated from the elastic-plastic finite-element results. The stress intensity factor values were evaluated on the basis of the calculated J-integrals and compared with the preliminary material fracture toughness data obtained from the Prometey Institute. When the calculated temperatures, strains and crack opening displacements are compared to measured values, a sufficient agreement is observed. The calculated stress intensity factor exceeds the preliminary material fracture toughness value and thus crack initiation is predicted.

AB - The behaviour of a model pressure vessel is studied in a pressurized thermal shock loading. The tests were performed at the Prometey Institute in St. Petersburg. The calculations were performed at the Technical Research Centre of Finland. This report describes the preliminary finite- element analyses for the fourth, fifth and sixth thermoshock tests with the first model pressure vessel. Seven pressurized thermoshock tests were made with the same model pressure vessel using five different flaw geometries. In the first three tests the flaw was actually a blunt notch. In the two following tests (tests 4 and 5) a sharp pre-crack was produced before the test. In the last two tests (tests 6 and 7) the old crack was used. According to the measurements and a post-test ultrasonic examination of the crack front, the sixth test led to significant crack extension. Both temperatures and stresses were calculated using the finite- element method. The calculations were made using the idealized initial flaw geometry and preliminary material data. Both two- and three-dimensional models were used in the calculations. J-integral values were calculated from the elastic-plastic finite-element results. The stress intensity factor values were evaluated on the basis of the calculated J-integrals and compared with the preliminary material fracture toughness data obtained from the Prometey Institute. When the calculated temperatures, strains and crack opening displacements are compared to measured values, a sufficient agreement is observed. The calculated stress intensity factor exceeds the preliminary material fracture toughness value and thus crack initiation is predicted.

KW - pressure vessels

KW - model tests

KW - thermal shock

KW - finite element analysis

KW - temperature

KW - pressurizing

KW - stresses

KW - thermal stresses

KW - cracking (fracturing)

KW - crack propagation

KW - crack initiation

KW - calculations

M3 - Report

SN - 951-38-4221-5

T3 - VTT Publications

BT - Finite-element pre-analyses for pressurized thermoshock tests

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Keinänen H, Talja H, Lehtonen M, Rintamaa R, Ahlstrand R, Nurkkala P et al. Finite-element pre-analyses for pressurized thermoshock tests: Vessel I: Tests 4, 5 and 6. Espoo: VTT Technical Research Centre of Finland, 1992. 39 p. (VTT Publications; No. 103).