Crack Growth Process of Ni-Single Crystal with Cathodic Hydrogen Charging

2007 ◽  
pp. 137-140
Author(s):  
H. Matsui ◽  
N. Takano
Keyword(s):  
Single Crystal ◽  
Crack Growth ◽  
Growth Process ◽  
Hydrogen Charging ◽  
Crack Growth Process

Crack Growth Process of Ni-Single Crystal with Cathodic Hydrogen Charging

2007 ◽  
Vol 348-349 ◽  
pp. 137-140
Author(s):  
H. Matsui ◽  
Noriyuki Takano
Keyword(s):  
Single Crystal ◽  
Crack Growth ◽  
Cleavage Fracture ◽  
Growth Process ◽  
Tensile Axis ◽  
Tensile Tests ◽  
Slip Systems ◽  
Fracture Surfaces ◽  
Scanning Electron ◽  
Crack Growth Process

Notched tensile tests {orientation: tensile axis [001], direction of notching [010]or[110] } were performed to investigate the crack growth process in Ni-single crystal with hydrogen cathodic charging. Y-shaped hillocks and striation-like patterns were observed on the fracture surfaces of hydrogen embrittled specimens using the scanning electron microscope (SEM). The Y-shaped hillocks are exactly matched on both fracture surfaces of a specimen. In addition, cleavage fracture is occurred between a Y-shaped hillock and next one. It means that the cleavage fracture is occurred at first, and the Y-shaped hillock is secondary formed. It is considered that the striation-like pattern is formed by the localized slips and cleavage fracture between them. Peach-Koehler’s law leads that the dislocations on the equivalent slip systems with (111　)　[101] are subjected to the highest force of all dislocations at the crack tip. Furthermore, Ni-hydride was not observed on the surface of specimen just after charging hydrogen. Thus, it was concluded that Y-shaped hillock and striation-like pattern were occurred in Ni-single crystal with charging hydrogen under condition that Ni-hydride is not formed.

Finite element model for crack growth process in concrete bituminous

2012 ◽  
Vol 44 (1) ◽  
pp. 35-43 ◽  
Author(s):  
F. Dubois ◽  
R. Moutou-Pitti ◽  
B. Picoux ◽  
C. Petit
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Crack Growth ◽  
Growth Process ◽  
Element Model ◽  
Crack Growth Process

scholarly journals Energy description of fatigue crack growth process - theoretical and experimental approach

2017 ◽  
Vol 5 ◽  
pp. 904-911 ◽  
Author(s):  
G. Lesiuk ◽  
M. Szata ◽  
D. Rozumek ◽  
Z. Marciniak ◽  
J.A.F.O. Correia ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Process ◽  
Experimental Approach ◽  
Crack Growth Process
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