Statistical models for the analysis of fracture toughness test data

In this study the analysis of fracture toughness test data has been performed in terms of estimation of the proper T0 value for several WWER-1000 RPV materials in unirradiated condition. The surveillance test data for the standard and reconstituted specimens were included in the analysis. It was found that a reference temperature T0 for reconstituted specimens is 31°C higher on average in comparison to the standard specimens. The possible reason is a high level of the stress intensity factor Kmax during the cycle at the stage of completion of crack tip sharpening for standard specimens. Furthermore, the Charpy impact and fracture toughness test data for standard and reconstituted specimens have been compared considering the known relationship between the reference temperature T0 and the transition temperature T28J which corresponds to the Charpy energy level of 28 J. Another objective of this study was to compare the RPV metal embrittlement rate for the two reactor pressure vessels using surveillance test data from standard and reconstituted fracture toughness specimens. The analysis has shown that test data for the reconstituted specimens is consistent with the test data for the standard specimens with regard to the embrittlement rate.

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A Method to Quantify Thermal Aging Effect on Fracture Toughness of Cast Stainless Steels Using Small Punch Test

Volume 1: Codes and Standards ◽

10.1115/pvp2014-28233 ◽

2014 ◽

Author(s):

Jun-Young Jeon ◽

Dong-Il Ryu ◽

Yun-Jae Kim ◽

Mi-Yeon Lee ◽

Jin-Weon Kim

Keyword(s):

Fracture Toughness ◽

Test Data ◽

Stainless Steels ◽

Fracture Strain ◽

Fracture Toughness Test ◽

Small Punch ◽

Fracture Simulation ◽

Toughness Test ◽

Axial Fracture ◽

Strain Model

In this study, a method to predict fracture toughness of aged cast austenitic stainless steels (CASSs) using small punch (SP) test and finite element (FE) analysis is proposed. Grade CF8M is considered and thermally aged up to 5,000 hours at 400°C. SP tests and fracture toughness test using compact tension (C(T)) specimen are conducted with virgin (unaged) and aged CF8M. FE analyses performed in this study use ductile fracture simulation technique with ‘the multi-axial fracture strain model’. The multi-axial fracture strain model for each aged CF8M are determined from SP test data and FE analyses. Fracture toughness of aged CF8M are predicted by conducting fracture toughness test simulations using FE damage analyses. Predicted fracture toughness results are compared with C(T) data to validate the method suggested in this study. The predicted initiation toughness values are predicted well and fracture toughness values are slightly conservative compared to test data.

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STATISTICAL EVALUATION OF FRACTURE TOUGHNESS TEST DATA

Fatigue & Fracture of Engineering Materials & Structures ◽

10.1111/j.1460-2695.1993.tb00733.x ◽

1993 ◽

Vol 16 (11) ◽

pp. 1187-1202 ◽

Cited By ~ 6

Author(s):

Mons Hauge ◽

Christian Thaulow

Keyword(s):

Fracture Toughness ◽

Test Data ◽

Statistical Evaluation ◽

Fracture Toughness Test ◽

Toughness Test

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Precise Instrumentation and Stabilization of Interlaminar Fracture Toughness Test on CFRP by Long Gage Strain Measurement.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.65.1405 ◽

1999 ◽

Vol 65 (634) ◽

pp. 1405-1411

Author(s):

Kouichi KATSURA ◽

Kiyoshi TANAKA ◽

Kenji AONO

Keyword(s):

Fracture Toughness ◽

Strain Measurement ◽

Fracture Toughness Test ◽

Interlaminar Fracture Toughness ◽

Interlaminar Fracture ◽

Toughness Test

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Experimental Investigation on Relative Crack Length For Fracture Toughness of Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.146-147.1524 ◽

2010 ◽

Vol 146-147 ◽

pp. 1524-1528 ◽

Cited By ~ 3

Author(s):

Xue Zhi Wang ◽

Zong Chao Xu ◽

Zhong Bi ◽

Hao Wang

Keyword(s):

Fracture Toughness ◽

Experimental Investigation ◽

Crack Length ◽

Fracture Toughness Test ◽

Test Results ◽

Toughness Test ◽

Wedge Splitting Test ◽

Splitting Test ◽

Wedge Splitting

The wedge splitting test specimens with three series of different relative crack length were used to study the influences of relative crack length on the fracture toughness of common concrete. The suitable formulation for fracture toughness of concrete with different relative crack length was gotten on comparing between fracture toughness test results and computation results of the model developed from Hu formula.

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