A Technique for Measuring Load-Line Displacements of Compact Ductile Fracture Toughness Specimens at Elevated Temperatures

1977 ◽  
Vol 5 (6) ◽  
pp. 446 ◽  
Author(s):  
RL Meltzer ◽  
KC Lieb ◽  
RT Horstman ◽  
IC Moore ◽  
WJ Mills ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Ductile Fracture ◽  
Elevated Temperatures ◽  
Load Line ◽  
Ductile Fracture Toughness

Effect of inclusion density on ductile fracture toughness and roughness

2014 ◽  
Vol 63 ◽  
pp. 62-79 ◽  
Author(s):  
A. Srivastava ◽  
L. Ponson ◽  
S. Osovski ◽  
E. Bouchaud ◽  
V. Tvergaard ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Ductile Fracture ◽  
Ductile Fracture Toughness

About Relation Between Irradiation Hardening of Ferritic Steels and Ductile Fracture Toughness Decrease

2009 ◽  
Author(s):  
Jiri Novak
Keyword(s):  
Fracture Toughness ◽  
Temperature Dependence ◽  
Ductile Fracture ◽  
Stress Level ◽  
Deformation Theory ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Irradiation Hardening ◽  
Ductile Fracture Toughness

We showed recently that temperature dependence of the ductile fracture toughness can be predicted on the base of two assumptions: 1) assumption of constant characteristic length, 2) assumption of proportionality between J-R curve slope and deformation work in unit volume, evaluated from zero to critical strain for initiation of deformation bands determined in plane strain geometry for material modeled by deformation theory of plasticity. Temperature dependence of ductile fracture toughness results simply from temperature dependence of the stress-strain curve. Irradiation hardening changes stress-strain behavior in a qualitatively different way: It is observed that irradiation hardening to certain yield stress level changes the stress-strain curve of the material in the same way as prestraining of the unirradiated material to the same flow stress level does. Equivalence of irradiation and prestraining concerns all key properties of deformation theory; namely the secant modulus should be taken from the stress-strain curve of unirradiated material. With exception of this specific feature, the task of finding relative fracture toughness decrease by irradiation is the same as prediction of relative decrease of fracture toughness by temperature change. In the frame of the corresponding theory, relative decrease of ductile fracture toughness expressed by J-R curve slope can be obtained from the stress-strain curve of unirradiated material and irradiation hardening level. Quantitative results are presented for the weld metals 72W and 73W, studied in the Fifth Irradiation Series in the Heavy-Section Steel Irradiation Program, and compared with experimental data.

A Procedure for the Determination of Ductile Fracture Toughness Values Using J Integral Techniques

1979 ◽  
Vol 7 (1) ◽  
pp. 49 ◽  
Author(s):  
RT Horstman ◽  
KC Lieb ◽  
RL Meltzer ◽  
MB Vieth ◽  
GA Clarke ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Ductile Fracture ◽  
J Integral ◽  
Ductile Fracture Toughness

Establishment of Unified Correlation of In-Plane and Out-of-Plane Constraints with Ductile Fracture Toughness of Steel

2016 ◽  
Vol 853 ◽  
pp. 22-27 ◽  
Author(s):  
Bo Rui Yan ◽  
G.Z. Wang ◽  
Fu Zhen Xuan ◽  
Shan Tung Tu
Keyword(s):  
Fracture Toughness ◽  
Ductile Fracture ◽  
Structural Integrity ◽  
Damage Model ◽  
Equivalent Plastic Strain ◽  
Specimen Thickness ◽  
Wide Range ◽  
Out Of Plane ◽  
Correlation Line ◽  
Ductile Fracture Toughness

In this paper, the finite element method (FEM) based on GTN damage model was used to obtain ductile fracture toughness and investigate the establishment method of unified correlation of in-plane and out-of-plane constraints with ductile fracture toughness of steels. The unified constraint parameter Ap at different equivalent plastic strain (εp) isolines has been calculated and analyzed for SEN(B) specimens with a wide range of in-plane and out-of-plane constraints. The results show that the average Ap along the specimen thickness (Apave) can well characterize a wide range of in-plane and out-of-plane constraints. The suitable εpisolines range for establishing the unified correlation between Apave and ductile fracture toughness of the steel has been obtained. For the specimens with lower constraint, the higher εp values should be used. The results also show that the correlation line of JC/Jref-Apave1/2is independent of the selections of the suitable εp isolines and the reference specimen. This may bring convenience for the establishment and application of the JC/Jref-Apave1/2correlation lines. Using ductile fracture toughness data of a small number of specimens with different constraints (such as three specimens with different a/W) together with FEM calculations of the parameter Ap, the correlation line of JC/Jref-Apave1/2can be established. The correlation line may be used in structural integrity assessments incorporating both in-plane and out-of-plane constraints.

Characterization of Ductile Fracture Toughness Based on Subsized Charpy and Tensile Test Results

2009 ◽  
pp. 63-63-19
Author(s):  
W Schmitt ◽  
H Talja ◽  
W Böhme ◽  
S Oeser ◽  
H Stöckl
Keyword(s):  
Fracture Toughness ◽  
Tensile Test ◽  
Ductile Fracture ◽  
Test Results ◽  
Ductile Fracture Toughness
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