Quasi-Static Brittle Fracture

1998 ◽  
Vol 539 ◽  
Author(s):  
J. A. Pfaendtner ◽  
R. C. Muthiah ◽  
C. J. McMahon
Keyword(s):  
Brittle Fracture ◽  
Recent Work ◽  
Diffusion Controlled ◽  
Intergranular Brittle Fracture ◽  
Dynamic Embrittlement

AbstractRecent work on the phenomenon of diffusion-controlled quasi-static brittle fracture, known as dynamic embrittlement, is reviewed here with reference to sulfur-induced embrittlement of steel, tin-induced embrittlement of Cu-Sn alloys, and oxygen-induced embrittlement of copper-based and nickel-based alloys. The mechanisms of this generic form of intergranular brittle fracture are discussed.

Quasi-static intergranular brittle fracture: Dynamic embrittlement

1995 ◽  
Vol 45 (11) ◽  
pp. 965-978 ◽  
Author(s):  
C. J. McMahon ◽  
J. A. Pfaendtner ◽  
R. C. Muthiah
Keyword(s):  
Brittle Fracture ◽  
Intergranular Brittle Fracture ◽  
Dynamic Embrittlement

Dynamic Embrittlement Of Beryllium-Strengthened Copper In Air

1995 ◽  
Vol 409 ◽  
Author(s):  
Ranjani C. Muthiah ◽  
C. J. McMahon ◽  
Amitava Guha
Keyword(s):  
Oxygen Diffusion ◽  
Model Material ◽  
Time To Failure ◽  
Temperature Model ◽  
Kcal Mole ◽  
Intergranular Cracking ◽  
Diffusion Controlled ◽  
Intergranular Brittle Fracture ◽  
Stress Dependent ◽  
Dynamic Embrittlement

AbstractA precipitation-hardened Cu-0.26%Be alloy is used as a low-temperature model material for “dynamic embrittlement”, or quasi-static diffusion-controlled intergranular brittle fracture. This alloy is shown to undergo intergranular cracking in air at 150°C and to be almost free of this cracking in 2×10−6 Torr vacuum at 200°C. The time to failure is highly stress dependent. The temperature dependence of cracking was found to be 30 kcal/mole. This is about 50% greater than the activation energy for oxygen diffusion in copper, but the present experiments also include an unknown incubation time.

A Study on Tensile Properties of NiCoCrAl/YSZ Multiscalar Microlaminate

2011 ◽  
Vol 311-313 ◽  
pp. 1769-1772
Author(s):  
Guo Dong Shi ◽  
Min Cong Liu ◽  
Sheng Jin
Keyword(s):  
Brittle Fracture ◽  
Tensile Testing ◽  
Room Temperature ◽  
Failure Modes ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Testing ◽  
Intergranular Brittle Fracture ◽  
Metal Layers ◽  
Thick Layers

One multiscalar microlaminate (MSML) with 5 thick layers of NiCoCrAl whose thickness were different interspersed with 66 thin layer stacks of NiCoCrAl/YSZ was fabricated by EB-PVD. Uniaxial tensile testing was performed and fracture was examined using SEM. The results show that the microlaminate exhibits brittle-like behavior without macroscopic plastic deformation in room temperature tensile tests and the maximum engineering stress is 212MPa. Examination of fracture surfaces from the samples reveals that ceramic layers fail by intergranular brittle fracture between columns, but metal layers display features of both ductile and brittle fracture. It is also found that the thicknesses of metal layers have a great effect on their failure modes. And interfacial debonding and bridging metal layers are observed. Moreover, the resistance of crack propagation in the microlaminate is discussed.

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