scholarly journals Interpretation of hydrogen-assisted fatigue crack propagation in BCC iron based on dislocation structure evolution around the crack wake

2018 ◽  
Vol 156 ◽  
pp. 245-253 ◽  
Author(s):  
Domas Birenis ◽  
Yuhei Ogawa ◽  
Hisao Matsunaga ◽  
Osamu Takakuwa ◽  
Junichiro Yamabe ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Dislocation Structure ◽  
Structure Evolution ◽  
Crack Wake ◽  
Bcc Iron ◽  
Iron Based

scholarly journals On the Influence of Loading Order in Nanostructural Fatigue Crack Propagation in BCC Iron—A Molecular Dynamics Study

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 684 ◽  
Author(s):  
Markus Ladinek ◽  
Thomas Hofer
Keyword(s):  
Molecular Dynamics ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Crack Growth ◽  
Fatigue Crack Propagation ◽  
Crack Growth Behaviour ◽  
Embedded Atom ◽  
Bcc Iron ◽  
Molecular Dynamics Methods ◽  
Eam Potential

Most investigations dealing with fatigue crack propagation on the nanoscale, limit their studies on a loading scenario of constant stress or strain amplitudes. Since such a load scenario is rather rare, this paper aims to examine the influence of the load sequence on the crack growth using bcc iron. For this purpose, a specimen containing a central crack was loaded repeatedly by varying the load amplitude. All computations were carried out using molecular dynamics methods (MD), and the material behaviour was represented by utilising an embedded atom method (EAM) potential. Significant deviation in the crack growth behaviour was observed when loading the specimens with variable amplitudes rather than with constant amplitudes. Cracks did not only extend during the loading phase but also in the initial phase of the unloading process where cracks expanded from voids that had been formed in the last phase of loading. These voids coalesced with the main crack as the specimen was subjected to further loading.

Fatigue crack propagation of AZ61 magnesium alloy under controlled humidity and visualization of hydrogen diffusion along the crack wake

2014 ◽  
Vol 59 ◽  
pp. 234-243 ◽  
Author(s):  
Yoshihiko Uematsu ◽  
Toshifumi Kakiuchi ◽  
Masaki Nakajima ◽  
Yuki Nakamura ◽  
Satoshi Miyazaki ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Magnesium Alloy ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Hydrogen Diffusion ◽  
Crack Wake ◽  
Az61 Magnesium Alloy

High Cycle Fatigue and Fatigue Crack Propagation Behaviors of Modified A7075-T73 Alloy

2014 ◽  
Vol 52 (4) ◽  
pp. 283-291 ◽  
Author(s):  
Gwan Yeong Kim ◽  
Kyu Sik Kim ◽  
Joong Cheol Park ◽  
Shae Kwang Kim ◽  
Young Ok Yoon ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
High Cycle Fatigue ◽  
Cycle Fatigue
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