Formation of a high-cycle fatigue fracture surface and a crack growth mechanism of ultrafine-grained copper with different stages of microstructural evolution

2010 ◽  
Vol 58 (19) ◽  
pp. 6294-6305 ◽  
Author(s):  
M. Goto ◽  
S.Z. Han ◽  
K. Euh ◽  
J.-H. Kang ◽  
S.S. Kim ◽  
...  
Keyword(s):  
Fracture Surface ◽  
Crack Growth ◽  
Fatigue Fracture ◽  
Microstructural Evolution ◽  
Growth Mechanism ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Fatigue Fracture Surface ◽  
Ultrafine Grained ◽  
Crack Growth Mechanism

scholarly journals Crack Growth Behavior and Fatigue Fracture Surface in Ultrafine Grained Copper Plain Specimens

2010 ◽  
Vol 76 (765) ◽  
pp. 610-616
Author(s):  
Masahiro GOTO ◽  
Yoshinori ANDO ◽  
Seung-Zeon HAN ◽  
Norihiro TESHIMA ◽  
Terutoshi YAKUSHIJI ◽  
...  
Keyword(s):  
Fracture Surface ◽  
Crack Growth ◽  
Fatigue Fracture ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Fatigue Fracture Surface ◽  
Ultrafine Grained

Analysis on Low Cycle Fatigue Life and Fatigue Fracture Surface Morphology of TC25 Titanium Alloy

2016 ◽  
Vol 697 ◽  
pp. 652-657
Author(s):  
Rong Guo Zhao ◽  
Yi Yan ◽  
Yong Zhou Jiang ◽  
Xi Yan Luo ◽  
Qi Bang Li ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Fatigue Crack ◽  
Fatigue Life ◽  
Fracture Surface ◽  
Crack Growth ◽  
Fatigue Fracture ◽  
Low Cycle Fatigue ◽  
Observation System ◽  
Cycle Fatigue ◽  
Stress Strain

At room temperature, the low cycle fatigue tests for smooth specimens of TC25 titanium alloy under various stress ranges are operated at a CSS280I-20w Electro Hydraulic Servo Universal Testing Machine with a microscopic observation system, and the low cycle fatigue lifetimes are measured. Based upon the analysis of stress-strain hysteresis loop of low cycle fatigue of TC25 titanium alloy, a simplified Manson-Coffin formula is derived according to both the experimental characteristics and the stress-strain constitutive model, the fatigue lifetimes are plotted against stress ranges, and a stress-fatigue life curve for TC25 titanium alloy is obtained by the linear regression analysis method. Finally, the fracture surface morphologies of TC25 specimens are investigated using a JSM-6360 Scanning Electron Microscopy, and the fatigue fracture mechanisms of low cycle fatigue are studied. It shows that the plastic deformations are mainly formed at the accelerated fracture stage, and various shear lips can be observed on the fracture surfaces, which demonstrates that the shear stress results in the final rupture of TC25 titanium alloy. During the fracture of low cycle fatigue, the cleavage nucleation leads to the formation of fatigue crack initiation region, the fatigue crack growth exhibits a mixed transgranular and intergranular crack growth mode, and in the final rupture region, the fracture surface of low cycle fatigue of TC25 titanium alloy appears as a typical semi-brittle fracture mode.

GS0302 Surface Damage and Crack Growth Behavior of Ultrafine Grained Copper in High-Cycle Fatigue

2008 ◽  
Vol 2008 (0) ◽  
pp. _GS0302-1_-_GS0302-2_
Author(s):  
Yoshinori ANDO ◽  
Masahiro GOTO ◽  
Seung-Zeon HAN ◽  
Norihiro TESHIMA ◽  
Takamasa HIMENO ◽  
...  
Keyword(s):  
Crack Growth ◽  
High Cycle Fatigue ◽  
Surface Damage ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Cycle Fatigue ◽  
Ultrafine Grained

Relationship between Grain Growth and Formation of Fracture Surface of Ultrafine Grained Cu in High-Cycle Fatigue

2016 ◽  
Vol 713 ◽  
pp. 147-150
Author(s):  
M. Goto ◽  
Seung Zeon Han ◽  
Takaei Yamamoto ◽  
J. Kitamura ◽  
Kamil Kusno ◽  
...  
Keyword(s):  
Fracture Surface ◽  
High Cycle Fatigue ◽  
Crack Tip ◽  
Plastic Zone Size ◽  
Fatigue Tests ◽  
Growth Behavior ◽  
Cycle Fatigue ◽  
Zone Size ◽  
Angular Pressing ◽  
Ultrafine Grained

Fatigue tests were conducted on specimens of ultrafine grained copper produced by equal channel angular pressing. The growth behavior of a fatal crack was monitored successively. The morphological features of the crack growth paths and fracture surfaces were influenced by variation of grain size and damaged areas of the crack tip, depending on the stage of progress of the fatigue damage. The change in fracture surface was discussed by considering the interrelation between the reversible plastic zone size at the crack tip and the microstructure evolved during cyclic stressing.

Correlation between fatigue crack growth rate and striation spacing in XZM

1990 ◽  
Vol 48 (4) ◽  
pp. 834-835
Author(s):  
Scott M. DeTurk ◽  
Roy J. Cunningham
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Fracture Surface ◽  
Crack Growth ◽  
Fatigue Fracture ◽  
Growth Rates ◽  
Load Cycle ◽  
Fatigue Fracture Surface ◽  
Metallic Component ◽  
The Relationship

Much information can be learned from the fracture surface of a metallic component. At a microscopic level, the relationship between a fatigue fracture surface and the rate at which the crack propagated through the material is of particular interest. At certain growth rates, a fatigue fracture surface is comprised of striations which are the results of a cyclical loading being applied to a component. When evaluating a fatigue fracture surface to determine crack growth rates, a Transmission Electron Microscope (TEM) is employed to observe the striations. However, the following question arises, “Does one fatigue striation equal one load cycle”? In previously published literature, the relationship of one striation being equal to one load cycle has been confirmed for various aluminum alloys. The test data presented herein is for steel, i.e., a High Hot Hardness (HHH) gear material utilized in helicopter transmissions. The correlation of one striation being equal to one load cycle was obtained and documented during a fatigue crack growth test of X2M gear steel. A prime use of this data would be in the evaluation of a fatigue fracture surface to determine the initiation time and propagation rate for a service related failure.

Sign in / Sign up

Export Citation Format

Share Document