Inverse of Wallin's relation for the effect of strain rate on the ASTM E-1921 reference temperature and its application to reference temperature estimation from Charpy tests

Sreenivasan, P.R.

doi:10.1016/j.nucengdes.2010.09.035

Cited by 11 publications

(9 citation statements)

References 16 publications

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“…For calibration of the procedure, that is for determining the scaling factors as discussed in the previous paragraph, the data for the steels tested mainly at 20-25 º C or 280-300 º C and described in Aurich [4], Blauel [12], Eberle [13], Yoon [14] and El-Fadaly [15] have been used. For later comparison of the reference temperature estimates, apart from the above steels (only those for which full transition range Charpy data are available), all the steels described in Sreenivasan [9] have been used along with a few other steel data culled from recent literature, which are not listed here to restrict the bulk of the paper.…”

Section: Methodsmentioning

confidence: 99%

“…Since all the calibrations given Table 1 pertain to 1" thick quasi-static test, the K J-WLm values obtained from J WL are considered as pertaining to 1" specimen tests. Equation (6) is as given below [10,9]…”

Section: Application Of K J-wlm For Estimation Of Astm E 1921 Referenmentioning

confidence: 99%

“…(6) range from 100-170 to 200-270 MPa√m, depending on the steel. Figure 4 shows the residuals of the T Q-WL values (i. e., T 0 (test) -T Q-WL ) for about 59 steels (all steels mentioned in [9] plus some additional steels) in comparison with other estimates discussed in [9] (T Q-IGC : T Q-est based on the IGC procedure described by Sreenivasan [9] and T Q-41J : taking T Q-est = T 41J , the 41J Charpy transition temperature, a very conservative estimate). It can be seen that T Q-WL is either as much conservative or more over the whole range of T 0 values ranging from about -140 to +140°C examined in Fig.…”

Section: Application Of K J-wlm For Estimation Of Astm E 1921 Referenmentioning

confidence: 99%

“…To achieve this, many Charpy-fracture toughness correlations have been proposed; because of differences in loading rate, notch acuity, constraint etc. between the Charpy and fracture toughness tests, these lack universal applicability and are restricted to the specific material and test conditions for which they were derived [1][2][3][4][5][6][7][8][9]. However, some of the recent correlations are more promising from the point of view of producing design relevant fracture toughness properties that are consistently, and, often, assuredly, conservative [1,9].…”

Section: Introductionmentioning

confidence: 99%

“…Then this method is applied to fracture toughness and reference temperature (T 0 -ASTM E-1921 [10]) estimation from the full Charpy-transition data. The results are compared with those from Sreenivasan's [9] IGC-procedure and modifications, if any, are suggested. Also, the effectiveness of the new formulae in predicting the upper-shelf fracture toughness is examined and compared with the results from the well known Rolfe-Novak-Barsom (RNB) equation [3].…”

Section: Introductionmentioning

confidence: 99%

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Estimation of quasi-static J–R curves from Charpy energy and adaptation to ASTM E 1921 reference temperature estimation of ferritic steels

Sreenivasan¹

2014

Nuclear Engineering and Design

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Many researchers had suggested a sort of scaling procedure for predicting the quasi-static J-R curves from dynamic J-R curves obtained from instrumented Charpy V-notch (CVN) impact tests using key-curve, compliance or other procedures. Chaouadi, based on extensive tests and literature data, had quantitatively formalized the method and suggested general applicability of his method for a class of steels. In this paper, first, Chauoadi-procedure is tried on some selected data from the literature (including the data used by Chaouadi and other workers) and an adaptation of the method is suggested using Wallin's as well as Landes's lower bound methods for upper-shelf J-R curve estimation from CVN energy. Using Chaouadi and other data as the benchmark, suitable scaling factors have been determined that enable estimation of quasi-static J-R curves from CVN energy alone, without the need for dynamic CVN J-R curves. The final formulae are given. This new method can be called modified Wallin-Landes procedure. Then this method is applied to fracture toughness and reference temperature (T 0 -ASTM E-1921) estimation from the full Charpy-transition data. The results are compared with those from the author's IGC-procedure, and modifications , if any, are suggested. Based on the new results, it is suggested that the IGC-procedure may be modified as: final T Q-est = T Q-IGC for T Q-Sch dy ≤ 20 °C (in the IGC-procedure the dividing temperature was 60 °C); and for T Q-Sch dy > 20°C, T Q-IGC = T Q-WLm (different from the IGC-procedre and subscript WLm indicating modified Wallin-Landes procedure). For the 59 or more steels examined (including highly irradiated steels), the T Q-WL estimates at higher temperatures are consistent and conservative; a few non-conservative values are acceptably less than 20°C, where as other predictions show non-conservatism of up to 40-50°C. At lower temperatures, T Q-IGC is consistently conservative and not over-conservative as the other estimates. The limitations suggested by Chaouadi for his method, namely, dependence on work-hardening, strain rate, yield stress, etc., hold good for the present method also and require further quantification based on finite element analysis, if necessary; however, these are not likely to affect the T Q estimation significantly. K J-WLm is better than RNB correlation in making a conservative or closer estimate of fracture toughness at the upper shelf. 1000 1200 QS J R -CT25 test J W J L J WLm J Ch J R CVN dynamic Steel: E460(3) tested at 20 0 C  ys = 480 MPa;  yd = 626 MPa Charpy energy, C V = 104 J Average J R-QS /J W : 1.55 Average J R-QS /J L : 2.295

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Section: Methodsmentioning

confidence: 99%

Section: Application Of K J-wlm For Estimation Of Astm E 1921 Referenmentioning

confidence: 99%

Section: Application Of K J-wlm For Estimation Of Astm E 1921 Referenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Estimation of quasi-static J–R curves from Charpy energy and adaptation to ASTM E 1921 reference temperature estimation of ferritic steels

Sreenivasan¹

2014

Nuclear Engineering and Design

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Transition Reference Temperature for 20MnMoNi55 RPV Steel at Different Loading Rates

Paul

Acharyya

Sahoo

et al. 2019

Lecture Notes on Multidisciplinary Industrial Engineering

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Reliability research of reference temperature estimation of RPV materials using Charpy impact energy

Yin

Jin

2019

SN Appl. Sci.

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The standard fracture toughness test is usually limited in practical engineering projects due to the expensive and sophisticated experimental procedure or limited specimens. The traditional method to evaluate the structural integrity is to estimate the ductile-brittle transition region by Charpy tests. However, this fuzzy estimation is sometimes too conservative and cannot obtain quantitative fracture toughness data. In recent years, many achievements have been made in the study of the relations between Charpy impact test and fracture toughness test. Although acceptable, the errors caused by these formulas are rarely compared in detail formulas with stable deviation will be more suitable for research or engineering application. Therefore, this paper compares the data of four different ferritic steels to test the error stability of each formula, so as to provide reference for experimental research and engineering facilities. The reliability of each correlation is checked from the view of accuracy or appropriate conservatism. In this research, We found that the T 28J-T 0 correlations, the empirical formula proposed by Rolfe, Novak and Barsom (abbreviated as RNB) and the Mean-4 Procedure obtained by IGC-parameter give the reference temperatures more accurately or appropriately conservatively. These formulas should be preferred in practical application.

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Inverse of Wallin's relation for the effect of strain rate on the ASTM E-1921 reference temperature and its application to reference temperature estimation from Charpy tests

Cited by 11 publications

References 16 publications

Estimation of quasi-static J–R curves from Charpy energy and adaptation to ASTM E 1921 reference temperature estimation of ferritic steels

Estimation of quasi-static J–R curves from Charpy energy and adaptation to ASTM E 1921 reference temperature estimation of ferritic steels

Transition Reference Temperature for 20MnMoNi55 RPV Steel at Different Loading Rates

Reliability research of reference temperature estimation of RPV materials using Charpy impact energy

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