A model of ductile fracture based on the nucleation and growth of voids

1981 ◽  
Vol 29 (8) ◽  
pp. 1509-1522 ◽  
Author(s):  
G. Le Roy ◽  
J.D. Embury ◽  
G. Edwards ◽  
M.F. Ashby
Keyword(s):  
Ductile Fracture ◽  
Nucleation And Growth ◽  
Growth Of Voids

Observations oh Nucleation and Growth of Voids in Nickel

1970 ◽  
Vol 28 ◽  
pp. 414-415
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
B. Mastel
Keyword(s):  
High Purity ◽  
Growth Stage ◽  
Elevated Temperatures ◽  
Early Growth ◽  
Nucleation And Growth ◽  
Pure Nickel ◽  
Different Temperatures ◽  
Total Fluence ◽  
Neutron Exposure ◽  
Growth Of Voids

Some information on the size and density of voids that develop in several high purity metals and alloys during irradiation with neutrons at elevated temperatures has been reported as a function of irradiation parameters. An area of particular interest is the nucleation and early growth stage of voids. It is the purpose of this paper to describe the microstructure in high purity nickel after irradiation to a very low but constant neutron exposure at three different temperatures.Annealed specimens of 99-997% pure nickel in the form of foils 75μ thick were irradiated in a capsule to a total fluence of 2.2 × 1019 n/cm2 (E > 1.0 MeV). The capsule consisted of three temperature zones maintained by heaters and monitored by thermocouples at 350, 400, and 450°C, respectively. The temperature was automatically dropped to 60°C while the reactor was down.

Nucleation and growth of voids by radiation

1980 ◽  
Vol 95 (1-2) ◽  
pp. 44-45 ◽  
Author(s):  
R.M. Mayer ◽  
L.M. Brown ◽  
U. Gösele
Keyword(s):  
Nucleation And Growth ◽  
Growth Of Voids

Nucleation and Growth of Voids in Silicon

1997 ◽  
Vol 490 ◽  
Author(s):  
P. S. Plekhanov ◽  
U. M. Gösele ◽  
T. Y. Tan
Keyword(s):  
Void Growth ◽  
Homogeneous Nucleation ◽  
Nucleation And Growth ◽  
Vacancy Formation ◽  
Limited Time ◽  
Dislocation Loops ◽  
Nucleation Barrier ◽  
Different Temperatures ◽  
Type Dislocation ◽  
Growth Of Voids

ABSTRACTNucleation of voids and vacancy-type dislocation loops in Si under vacancy supersaturation conditions has been considered. Based upon nucleation barrier calculations, it has been found that voids can be nucleated, but not dislocation loops. The homogeneous nucleation rate of voids has been calculated for different temperatures by assuming different enthalpy values of Si vacancy formation. The process of void growth due to precipitation of vacancies has been numerically simulated. Comparing results of the nucleation and the growth modeling and taking into account the competition between the two processes, the limited time available, and the crystal cooling rate after growth, it has been shown that homogeneous nucleation of voids to experimentally observed densities and void growth to observed sizes is possible if enthalpy of Si vacancy formation is within the range of 2.9 to 3.6 eV with the nucleation temperature in the range of 980–1080 °C.

The nucleation and growth of voids at carbides in 9 Cr-1 Mo steel

1986 ◽  
Vol 34 (7) ◽  
pp. 1321-1327 ◽  
Author(s):  
B.A. Senior ◽  
F.W. Noble ◽  
B.L. Eyre
Keyword(s):  
Nucleation And Growth ◽  
Growth Of Voids

Coalescence-Controlled Anisotropic Ductile Fracture

1999 ◽  
Vol 121 (2) ◽  
pp. 221-229 ◽  
Author(s):  
A. A. Benzerga ◽  
J. Besson ◽  
A. Pineau
Keyword(s):  
Ductile Fracture ◽  
Shape Change ◽  
Manganese Sulfide ◽  
Limit Load ◽  
Low Alloy Steels ◽  
Load Models ◽  
Spacing Effects ◽  
Alloy Steels ◽  
Void Shape ◽  
Growth Of Voids

The anisotropic ductile fracture of rolled plates containing elongated inclusions is promoted by both the dilational growth of voids and the coalescence process. In the present article, the emphasis is laid on the latter process. The effects of void shape and mainly of inter-particle spacings are investigated. Two types of coalescence models are compared: a localization-based model and plastic limit-load models. The capabilities of both approaches to incorporate shape change and spacing effects are discussed. These models are used to predict the fracture properties of two low alloy steels containing mainly manganese sulfide inclusions. Both materials are characterized in different loading directions. Microstructural data inferred from quantitative metallography are used to derive theoretical values of critical void volume fractions at incipient coalescence. These values are used in FE-calculations of axisymmetrically notched specimens with different notch radii and loading directions.

Nucleation and Growth of Voids in Quenched Aluminum

1966 ◽  
Vol 21 (11) ◽  
pp. 2291-2299 ◽  
Author(s):  
Michio Kiritani ◽  
Akikazu Sato ◽  
Sho Yoshida
Keyword(s):  
Nucleation And Growth ◽  
Growth Of Voids
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