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Calibration of Beremin Parameters for 20MnMoNi55 Steel and Prediction of Reference Temperature (T0) for Different Thicknesses and a/W Ratios

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Abstract

Master curve and reference temperature (T0) from three-point bending specimens of 20MnMoNi55 steel for different thicknesses and a/W ratios are determined using Kim Wallin’s master curve methodology (ASTM E1921-02) to study the effect of variation in thickness and a/W ratio at reference temperature (T0). Weibull stress at the crack tip is calculated from FE analysis of each fracture test using FE software ABAQUS. Calibration of Beremin parameters, like Weibull modulus (m) and scaling parameter (σu), and Cm,n is done using linear regression analysis of a large number of fracture test data at single test temperature. T0 for different thicknesses and a/W ratios are also evaluated from corresponding Weibull stress based on Beremin model using calibrated m, σu and Cm,n which are compared with experimental results showing case-specific good matching. The same calibrated values of Beremin parameters and Cm,n are also used to evaluate T0 for CT specimen of the same material using Beremin model, and an excellent matching with the experimental result is found.

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Abbreviations

m :

Weibull modulus

σ u :

Scaling parameter

C m,n :

Beremin coefficient

σ w :

Weibull stress

a :

Physical crack size (mm)

B :

Gross thickness of specimens (mm)

B 1T :

Thickness of 1T (one inch) specimen

B 0 :

Thickness of tested specimen (mm)

a/W :

Crack length-to-width ratio of the specimen

W :

Specimen width

RPV:

Reactor pressure vessel

DBT:

Ductile-to-brittle transition

TPB:

Three-point bending

CT:

Compact tension

P f :

Probability of fracture

K JC :

Converted value of JC equal to critical K

K min :

Minimum possible fracture toughness

K JC(median) :

Median fracture toughness

K 0 :

Scale parameter dependent on test temperature and specimen thickness

M :

Censor parameter

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Authors and Affiliations

  1. Department of Mechanical Engineering, Jadavpur University, 188, Raja S. C. Mallick Road, Kolkata, West Bengal, 700032, India

    K. Bhattacharyya, S. Acharyya & S. Dhar

  2. Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    J. Chattopadhyay

Authors
  1. K. Bhattacharyya
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  2. S. Acharyya
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  3. S. Dhar
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  4. J. Chattopadhyay
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Correspondence to K. Bhattacharyya.

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Bhattacharyya, K., Acharyya, S., Dhar, S. et al. Calibration of Beremin Parameters for 20MnMoNi55 Steel and Prediction of Reference Temperature (T0) for Different Thicknesses and a/W Ratios. J Fail. Anal. and Preven. 18, 1534–1547 (2018). https://doi.org/10.1007/s11668-018-0549-7

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