OS12-8 Effects of Crack Closure on Fatigue Crack Propagation Properties in Submicron-Thick Freestanding Copper Films(Mechanical properties of nano- and micro-materials-2,OS12 Mechanical properties of nano- and micro-materials,MICRO AND NANO MECHANICS)

2015 ◽  
Vol 2015.14 (0) ◽  
pp. 190
Author(s):  
Toshiyuki KONDO ◽  
Takaki ISHI ◽  
Hiroyuki HIRAKATA ◽  
Kohji MINOSHIMA
Keyword(s):  
Mechanical Properties ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Crack Closure ◽  
Copper Films ◽  
Propagation Properties

Effects of stress ratio on fatigue crack propagation properties of submicron-thick free-standing copper films

2013 ◽  
Vol 61 (16) ◽  
pp. 6310-6327 ◽  
Author(s):  
Toshiyuki Kondo ◽  
Takahiro Imaoka ◽  
Hiroyuki Hirakata ◽  
Masayuki Sakihara ◽  
Kohji Minoshima
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Stress Ratio ◽  
Copper Films ◽  
Free Standing ◽  
Effects Of Stress ◽  
Propagation Properties

scholarly journals P-Texture Effect on the Fatigue Crack Propagation Resistance in an Al-Cu-Mg Alloy Bearing a Small Amount of Silver

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2481 ◽  
Author(s):  
Yangcheng Hu ◽  
Zhiyi Liu ◽  
Qi Zhao ◽  
Song Bai ◽  
Fei Liu
Keyword(s):  
Electron Microscopy ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Crack Closure ◽  
High Intensity ◽  
Damage Tolerance ◽  
Mg Alloy ◽  
Random Texture ◽  
Texture Effect

P-texture effect on the fatigue crack propagation (FCP) resistance in an Al-Cu-Mg alloy containing a small amount of Ag, is investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron back scattering diffraction (EBSD). Results shows that the high intensity P-texture sheet has lower σ0.2/σb, lower FCP rate and higher damage tolerance than random texture sheet. Fracture analysis indicates that the striations spacing of high intensity P-texture sheet is much smaller than that of random texture sheet and it has a rougher fatigue fracture surface, which causes a significant roughness induced crack closure (RICC) effect. The calculation results manifest that high intensity P-texture sheet possesses a higher crack closure level reaching 0.73 as compared to random texture sheet (only 0.25). The statistical analysis results reveal the P-grains have large twist angle of 105–170° and tilt angle of 5–60° with neighboring grains, which is similar to Goss-grains. This is the fundamental reason that P-texture sheet has the same FCP resistance and induces fatigue crack deflection as Goss-texture sheet. Additionally, the most {111} slipping planes of P-grains are distributed in the range of 30–50° deviating from transverse direction of the sheet. This results in more {111} slipping planes to participate in cyclic plastic deformation, which is beneficial to reduce fatigue damage accumulation and improve the damage tolerance of Al-Cu-Mg-Ag alloy.

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