Material characterization by J-R curves of a 20MnMoNi55 forging

Blauel, J.G.; Hodulak, L.; Hollstein, Thomas; Voss, B.

doi:10.1016/0308-0161(84)90066-8

Cited by 18 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The critical J-values at crack growth initiation are 168, 114 and 119 kN/m at 25°C, 300°C and 400°C, respectively. This is consistent with the behavior reported by other authors [10][11][12][13][14]. Since the influence of the loading rate on the deformation behavior has been found to be small, no great effect of loading rate on the JR -curve is expected and actually none is detected, In other materials, a higher strain rate tends to give slightly higher JR-curves [7,11 ].…”

Section: The Validity Of J In the Presence Of Time-dependent Deformationsupporting

confidence: 81%

See 1 more Smart Citation

Time-dependent deformation and fracture of steel between 20�C and 400�C

Kuhnle

Riedel

1987

Int J Fract

View full text Add to dashboard Cite

A~traet. The time-dependent deformation and cracking behavior of the quenched and tempered steel 15 NiCuMoNb 5 was investigated in the temperature range 20°C to 400°C. Fracture mechanics tests were carried out under various loading conditions including load-hold times of up to three weeks. The time-dependent crack growth can be described by the crack resistance (JR-) curve. Only above 300°C, the JR-curves obtained from constant-load tests start to deviate substantially from constant-displacement-rate tests. In this temperature range, the C,-parameter, which has been developed for creep crack growth testing, can be used to describe crack growth rates. For practical purposes, it is important to note that hold-time effects reduce the load-bearing capacity of cracked specimens by less than 10 percent for the present material and testing conditions.

show abstract

Section: The Validity Of J In the Presence Of Time-dependent Deformationsupporting

confidence: 81%

“…At the usual loading rates, the crack growth resistance as described by the JR-curve decreases with increasing temperature [10][11][12][13][14]. Ferritic steels often exhibit a minimum in crack resistance between 250°C and 300°C, which is usually ascribed to dynamic strain ageing.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent deformation and fracture of steel between 20�C and 400�C

Kuhnle

Riedel

1987

Int J Fract

View full text Add to dashboard Cite

show abstract

“…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%

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

View full text Add to dashboard Cite

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

show abstract

The effect of constraint on elastic-plastic fracture

Aurich

Sommer

1988

Steel Research

View full text Add to dashboard Cite

The influence of the local constraint in the near field zone of cracks in terms of the parameter (Ym/u,= f (r, e, s) on fracture initiation and fracture resistance is investigated for several crack configurations in specimens and components. Experimental results from various authors are compared with corresponding numerical findings. Methods to transfer test results obtained for specimens to more complex situations in components are reported.Uber den EinfluB der Verformungsbehinderung auf den elastisch-plastischen Bruch. Der EinfluB der 6rtlichen Verformungsbehinderung im Nahfeld von Rissen, dargestellt durch den Parameter a.Jtr; = f (r, e, s), auf die Bruchinitiierung und den Bruchwiderstand wird fur mehrere RiBkonfigurationen in Proben und Bauteilen untersucht. Experimentelle Ergebnisse von verschiedenen Autoren werden mit entsprechenden numerischen Resultaten verglichen. Uber die Obertragbarkeit von Versuchsergebnissen von Proben auf komplexere Situationen in Bauteilen wird berichtet.

show abstract

Material characterization by J-R curves of a 20MnMoNi55 forging

Cited by 18 publications

References 1 publication

Time-dependent deformation and fracture of steel between 20�C and 400�C

Time-dependent deformation and fracture of steel between 20�C and 400�C

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

The effect of constraint on elastic-plastic fracture

Contact Info

Product

Resources

About