Skip to main content
main-content
Top

Hint

Swipe to navigate through the articles of this issue

Published in: Strength of Materials 2/2022

13-06-2022

On Experimental Procedure Development for Evaluating the Effect of Biaxial Loading on the Static Crack Resistance Characteristics of Reactor Vessel Steels

Authors: V. V. Pokrovs’kyi, V. G. Sidyachenko, V. M. Ezhov

Published in: Strength of Materials | Issue 2/2022

Login to get access
share
SHARE

Abstract

According to modern normative documents, the loading of postulated cracks in reactor vessels and standard specimens during crack resistance tests has a number of differences, namely: biaxiality of certain load configurations on the crack faces can change during non-isothermal, nonmonotonic processes under emergency modes of thermal shock, while crack front have a semi-elliptical shape of with relative depth ratio of 0.1–0.15. These factors prompt the development of an experimental technique to study crack resistance on non-standard type specimens. Cross-shaped (cruciform) bending specimens with a semi-elliptic surface crack and a through linear short crack, as well as model strip specimens with similar cracks in previous tests, were designed and studied for their static fracture strength. A method for monitoring fatigue crack initiation on a cross-shaped specimen by changes in its suppleness has been proposed. Evolution of semi-elliptic crack front shape at its initiation from a surface stress raiser under cyclic bending load has been investigated and the possibility of obtaining fatigue semi-elliptic crack of a certain configuration close to the postulated, according to the normative documents of cracks was shown. On the basis of test results, it was established that at temperature 20°C for 15Kh2NMFA-A steel, the standard conditions of a plane deformation in the used specimens were not satisfied, leading to the overestimated values of crack resistance since the steel ductile-brittle transition temperature T0 (according to the Master-curve) was much lower. It was shown that the obtained increase in crack resistance under equal-axial bending is comparable with literature sources for the conditions of large-scale yielding with uniaxial loading.
Literature
1.
go back to reference ASTM E399-19. Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness K Ic of Metallic Materials, ASTM International, West Conshohocken, PA (2019). ASTM E399-19. Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness K Ic of Metallic Materials, ASTM International, West Conshohocken, PA (2019).
2.
go back to reference PNAE G-7-002-86. Strength Calculation Norms for Equipment and Pipelines of Nuclear Power Plants [in Russian], Gosatomnadzor of the USSR, Moscow (1989). PNAE G-7-002-86. Strength Calculation Norms for Equipment and Pipelines of Nuclear Power Plants [in Russian], Gosatomnadzor of the USSR, Moscow (1989).
3.
go back to reference RD EO 0606-2005. Methodology for Calculating the Brittle Fracture Resistance of WWER Reactor Pressure Vessels during Operation (MRKR-SKhR-2000) [in Russian], St. Petersburg–Moscow (2005). RD EO 0606-2005. Methodology for Calculating the Brittle Fracture Resistance of WWER Reactor Pressure Vessels during Operation (MRKR-SKhR-2000) [in Russian], St. Petersburg–Moscow (2005).
4.
go back to reference MT-D.0.03.391-09. Methodology for Assessment of Strength and Service Life of WWER Reactor Pressure Vessels during Operation [in Russian], SE NAEK “Energoatom” (2009). MT-D.0.03.391-09. Methodology for Assessment of Strength and Service Life of WWER Reactor Pressure Vessels during Operation [in Russian], SE NAEK “Energoatom” (2009).
5.
go back to reference V. V. Pokrovsky, V. T. Troshchenko, G. A. Kopchinsky, et al., “The influence of plastic prestraining on brittle fracture resistance of metallic materials with cracks,” Fatigue Fract. Eng. Mater. Struct., 18, No. 6, 731–746 (1995). CrossRef V. V. Pokrovsky, V. T. Troshchenko, G. A. Kopchinsky, et al., “The influence of plastic prestraining on brittle fracture resistance of metallic materials with cracks,” Fatigue Fract. Eng. Mater. Struct., 18, No. 6, 731–746 (1995). CrossRef
6.
go back to reference V. V. Pokrovsky, V. T. Troshchenko, V. G. Kaplunenko, et al., “A promising method for enhancing resistance of pressure vessels to brittle fracture,” Int. J. Pres. Ves. Pip. 58, 9–24 (1994). CrossRef V. V. Pokrovsky, V. T. Troshchenko, V. G. Kaplunenko, et al., “A promising method for enhancing resistance of pressure vessels to brittle fracture,” Int. J. Pres. Ves. Pip. 58, 9–24 (1994). CrossRef
7.
go back to reference G. Chell, “The effects of sub-critical crack growth on the fracture behavior of cracked ferritic steels after warm prestressing,” Fatigue Fract. Eng. Mater. Struct., 9, 259–274 (1986). CrossRef G. Chell, “The effects of sub-critical crack growth on the fracture behavior of cracked ferritic steels after warm prestressing,” Fatigue Fract. Eng. Mater. Struct., 9, 259–274 (1986). CrossRef
8.
go back to reference K. Wallin, “Master curve implementation of the warm prestress effect,” Eng. Fract. Mech., 70, 2587–2602 (2003). CrossRef K. Wallin, “Master curve implementation of the warm prestress effect,” Eng. Fract. Mech., 70, 2587–2602 (2003). CrossRef
9.
go back to reference T. D. Swankie and D. J. Smith, “Low temperature mixed mode fracture of a pressure vessel steel subject to prior loading,” Eng. Fract. Mech., 61, 387–405 (1998). CrossRef T. D. Swankie and D. J. Smith, “Low temperature mixed mode fracture of a pressure vessel steel subject to prior loading,” Eng. Fract. Mech., 61, 387–405 (1998). CrossRef
11.
go back to reference V. Pokrovskii, V. Sidyachenko, and V. Ezhov, “Numerical-experimental study of the viscosity of fracture of heat-resistant reactor steels with allowance for different modes of preliminary thermomechanical loading,” Vestn. TNTU, Special Issue, Part 1, 66–73 (2011). V. Pokrovskii, V. Sidyachenko, and V. Ezhov, “Numerical-experimental study of the viscosity of fracture of heat-resistant reactor steels with allowance for different modes of preliminary thermomechanical loading,” Vestn. TNTU, Special Issue, Part 1, 66–73 (2011).
12.
go back to reference B. Z. Margolin and V. I. Kostylev, “Analysis of biaxial loading effect on fracture toughnes of reactor pressure vessel steels,” Int. J. Pres. Ves. Pip., 75, 589–601 (1998). CrossRef B. Z. Margolin and V. I. Kostylev, “Analysis of biaxial loading effect on fracture toughnes of reactor pressure vessel steels,” Int. J. Pres. Ves. Pip., 75, 589–601 (1998). CrossRef
13.
go back to reference R. E. Link, J. A. Joyce, and C. Roe, “An experimental investigation of the effect of biaxial loading on the master curve transition temperature in RPV steels,” Eng. Fract. Mech., 74, 2824–2843 (2007). CrossRef R. E. Link, J. A. Joyce, and C. Roe, “An experimental investigation of the effect of biaxial loading on the master curve transition temperature in RPV steels,” Eng. Fract. Mech., 74, 2824–2843 (2007). CrossRef
14.
go back to reference J. Hohe, S. Luckow, V. Hardenacke, et al., “Enhanced fracture assessment under biaxial external loads using amall scale cruciform bending specimens,” Eng. Fract. Mech., 78, 1876–1894 (2011). CrossRef J. Hohe, S. Luckow, V. Hardenacke, et al., “Enhanced fracture assessment under biaxial external loads using amall scale cruciform bending specimens,” Eng. Fract. Mech., 78, 1876–1894 (2011). CrossRef
15.
go back to reference W. J. McAfee, B. R. Bass, J. W. Bryson, Jr, and W. E. Pennel, Biaxial Loading Effects on Fracture Toughness of Reactor Pressure Vessel Steel, NREG/CR-6273, Nuclear Regulatory Commission, Washington, DC (1995). W. J. McAfee, B. R. Bass, J. W. Bryson, Jr, and W. E. Pennel, Biaxial Loading Effects on Fracture Toughness of Reactor Pressure Vessel Steel, NREG/CR-6273, Nuclear Regulatory Commission, Washington, DC (1995).
16.
go back to reference D. Lidbury (Ed.), Validation of Constraint-Based Assessment Methodology in Structural Integrity (VOCALIST), Final Report (2006). D. Lidbury (Ed.), Validation of Constraint-Based Assessment Methodology in Structural Integrity (VOCALIST), Final Report (2006).
17.
go back to reference N. G. Taylor, K.-F. Nilsson, P. Minnebo, et al., NESC-IV Project, An Investigation of the Transferability of Master Curve Technology to Shallow Flaws in Reactor Pressure Vessel Applications, Final Report, European Commission (2005). N. G. Taylor, K.-F. Nilsson, P. Minnebo, et al., NESC-IV Project, An Investigation of the Transferability of Master Curve Technology to Shallow Flaws in Reactor Pressure Vessel Applications, Final Report, European Commission (2005).
18.
go back to reference B. R. Bass, J. W. Bryson, W. J. McAfee, et al., “Design of a cruciform bend specimen for determination of out-of-plane biaxial tensile stress effects on fracture toughness for shallow cracks,” in: SMiRT-12, CONF-930803-13 (1993). B. R. Bass, J. W. Bryson, W. J. McAfee, et al., “Design of a cruciform bend specimen for determination of out-of-plane biaxial tensile stress effects on fracture toughness for shallow cracks,” in: SMiRT-12, CONF-930803-13 (1993).
19.
go back to reference A. Obermeier, “CABINET: Constraint and Biaxial Loading Effects and Their Interaction Considering Thermal Transients (WPS),” in: Proc. of the 3rd Int. Conf. on NPP Life Management (PLiM), Salt Lake City, USA (2012). A. Obermeier, “CABINET: Constraint and Biaxial Loading Effects and Their Interaction Considering Thermal Transients (WPS),” in: Proc. of the 3rd Int. Conf. on NPP Life Management (PLiM), Salt Lake City, USA (2012).
21.
go back to reference Y. Murakami, Stress Intensity Factors Handbook, Vol. 2, Pergamon Press, Oxford–New York (1987). Y. Murakami, Stress Intensity Factors Handbook, Vol. 2, Pergamon Press, Oxford–New York (1987).
22.
go back to reference V. V. Panasyuk, A. I. Sushinskii, and L.V. Katsov, Fracture of Structural Elements with Non-Cross Cracks [in Russian], Naukova Dumka, Kiev (1991). V. V. Panasyuk, A. I. Sushinskii, and L.V. Katsov, Fracture of Structural Elements with Non-Cross Cracks [in Russian], Naukova Dumka, Kiev (1991).
23.
go back to reference GOST 25.506-85. Calculations and Strength Tests. Methods of Mechanical Tests of Metals. Determination of Crack Resistance Characteristics (Fracture Toughness) under Static Loading [in Russian], Valid since January 1, 1986. GOST 25.506-85. Calculations and Strength Tests. Methods of Mechanical Tests of Metals. Determination of Crack Resistance Characteristics (Fracture Toughness) under Static Loading [in Russian], Valid since January 1, 1986.
24.
go back to reference ASTM E1820-20b. Standard Test Method for Measurement of Fracture Toughness, ASTM International, West Conshohocken, PA (2020). ASTM E1820-20b. Standard Test Method for Measurement of Fracture Toughness, ASTM International, West Conshohocken, PA (2020).
25.
go back to reference V. S. Barbosa and C. Ruggieri, “Fracture toughness testing using non-standard bend specimens, Part I: Constraint effects and development of test procedure,” Eng. Fract. Mech., 195, 279–296 (2018). CrossRef V. S. Barbosa and C. Ruggieri, “Fracture toughness testing using non-standard bend specimens, Part I: Constraint effects and development of test procedure,” Eng. Fract. Mech., 195, 279–296 (2018). CrossRef
26.
go back to reference Y. Lei, “J-integral and limit load analysis of semi-elliptical surface cracks in plates under bending,” Int. J. Pres. Ves. Pip., 81, 31–41 (2004). CrossRef Y. Lei, “J-integral and limit load analysis of semi-elliptical surface cracks in plates under bending,” Int. J. Pres. Ves. Pip., 81, 31–41 (2004). CrossRef
27.
Metadata
Title
On Experimental Procedure Development for Evaluating the Effect of Biaxial Loading on the Static Crack Resistance Characteristics of Reactor Vessel Steels
Authors
V. V. Pokrovs’kyi
V. G. Sidyachenko
V. M. Ezhov
Publication date
13-06-2022
Publisher
Springer US
Published in
Strength of Materials / Issue 2/2022
Print ISSN: 0039-2316
Electronic ISSN: 1573-9325
DOI
https://doi.org/10.1007/s11223-022-00394-3

Other articles of this Issue 2/2022

Strength of Materials 2/2022 Go to the issue

Premium Partners