The local approach criterion of fracture mechanics, initially developed by Beremin for brittle cleavage fracture, is applied here to A508 class 3 low-alloy ferritic steel. This criterion, based on the maximum principal stress and Weibull statistics, has previously been verified in the case of uniaxial tests. In this study, it is extended to multiaxial loading tests, that can lead to more significant levels of plastic strain, and thus permit a study of the effect of plastic strain on cleavage fracture. Uniaxial tests on axisymmetric notched tensile bars (AE2-6) were used to determine Beremin’s model parameters m and σu. The cleavage fracture behavior, described by these parameters, was then verified by multiaxial tension-torsion tests carried out on thin tubular specimens. Numerical simulations of the tension-torsion tests, by the finite element method, were also performed, taking into account the nonlinear geometrical effects and the specimen plastic buckling. The buckling critical loads were calculated and used to ascertain whether fracture was associated with the instability phenomenon. Beremin’s model is shown to correctly describe experimental data which are not affected by buckling.

1.
Beremin
F. M.
,
1983
, “
A Local Criterion for Cleavage Fracture of a Nuclear Pressure Vessel Steel
,”
Metallurgical Transactions A
, Vol.
14A
, pp.
2277
2287
.
2.
Combescure
A.
,
1986
, “
Static and Dynamic Buckling of Large Thin Shells
,”
Nuclear Engineering and Design
, Vol.
92
, pp.
339
354
.
3.
Eripret, C., Lidbury, D. P. G., Sherry, A., and Howard, I., 1996, “Prediction of Fracture in the Transition Regime: Application to an A533B Pressure Vessel Steel,” 1st European Mechanics of Materials Conference on Local Approach to Fracture, September 9–11, Fontainebleau, France.
4.
Gurson
A. L.
,
1977
, “
Continuum Theory of Ductile Rupture by Void Nucleation and Growth: Part I—Yield Criteria and Flow Rules for Porous Ductile Media
,”
ASME Journal of Engineering Materials and Technology
, Vol.
99
, pp.
2
7
.
5.
INCA, 1986, A 2D Structural Analysis Code, CEA/DMT, Saclay, France.
6.
Kantidis
E.
,
Marini
B.
,
Allais
L.
, and
Pineau
A.
,
1994
, “
Validation of a Statistical Criterion for Intergranular Brittle Fracture of a Low Allow Steel through Uniaxial and Biaxial (Tension-Torsion) Tests
,”
International Journal of Fracture
, Vol.
66
, pp.
273
294
.
7.
Knott
J. F.
,
1967
, “
Effects of Strain on Notch Brittleness in Mild Steel
,”
Journal of The Iron and Steel Institute
, Vol.
205
, pp.
966
969
.
8.
Mudry, F., 1982, “Ductile Fracture and Cleavage Fracture of Low Alloy Steels,” thesis, Compie`gne, France.
9.
Mylonas
C.
,
Kobayashi
S.
, and
Armenakas
A. E.
,
1969
, “
Exhaustion of Ductile under Notch Constraint Following Uniform Prestraining
,”
Transactions of The Metallurgical Society
, AIME, Vol.
245
, pp.
919
927
.
10.
Renevey, S., Carassou, S., Marini, B., Eripret, C., and Pineau, A., 1996, “Ductile-Brittle Transition of Ferritic Steels Modelled by the Local Approach to Fracture,” 1st European Mechanics of Materials Conference on Local Approach to Fracture, September 9–11, Fontainebleau, France.
11.
Rousselier
G.
,
1987
, “
Ductile Fracture Models and Their Potential in Local Approach of Fracture
,”
Nuclear Engineering and Design
, Vol.
105
, pp.
97
111
.
12.
Soulat, P., Miannay, D., Marini, B., Schill, R., and Horowitz, H., 1993, “The Irradiation Embrittlement of Two Pressure Vessel Steels-Contribution of Local Approach,” IAEA Specialist Meeting on Irradiation Embrittlement and Optimization of Annealing, September 20–23, Paris, France.
13.
Timoshenko, S. P., 1966, Theory of Elastic Stability, McGraw-Hill, New York, NY.
14.
Zienkiewicz, O. G., 1977, The Finite Element Method, McGraw-Hill, New York, NY.
This content is only available via PDF.
You do not currently have access to this content.