Detecting Overload from Strain Information during Fatigue Crack Propagation under Negative Stress Ratio

2004 ◽  
Vol 32 (1) ◽  
pp. 11853 ◽  
Author(s):  
Chobin Makabe ◽  
Anindito Purnowidodo ◽  
Toshiyasu Sueyoshi ◽  
Takao Utsunomiya
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Stress Ratio

scholarly journals Effects of Crack Size, Stress Ratio and Hydrogen on the Near Threshold Fatigue Crack Propagation of High Strength Steel

2005 ◽  
Vol 54 (12) ◽  
pp. 1237-1243 ◽  
Author(s):  
Kazutoshi YANAGIHARA ◽  
Satoshi OHYANAGI ◽  
Masanobu KUBOTA ◽  
Chu SAKAE ◽  
Yoshiyuki KONDO
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
High Strength Steel ◽  
Stress Ratio ◽  
High Strength ◽  
Crack Size ◽  
Near Threshold

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 Effects of Shot-Peening and Stress Ratio on the Fatigue Crack Propagation of AL 7475-T7351 Specimens

2018 ◽  
Vol 8 (3) ◽  
pp. 375 ◽  
Author(s):  
Natália Ferreira ◽  
Pedro Antunes ◽  
José Ferreira ◽  
José D. M. Costa ◽  
Carlos Capela
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Shot Peening ◽  
Stress Ratio

Fundamental Research on Fatigue Properties of Closed-Packed Hexagonal Lattice Metal under Biaxial Stress

2007 ◽  
Vol 561-565 ◽  
pp. 167-170
Author(s):  
Yasumi Ito ◽  
Akira Shimamoto ◽  
Tetsuya Nemoto ◽  
Kazuharu Koide ◽  
Akira Inamori ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Magnesium Alloy ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Assisted Living ◽  
Stress Ratio ◽  
Hexagonal Lattice ◽  
Medical Implants ◽  
Biaxial Load ◽  
Joint Prostheses

Assisted living instruments and medical implants, such as wheelchairs and joint prostheses are usually subjected to biaxial or three-axial stresses instead of uniaxial stress. So, authors already developed a servo biaxial fatigue-testing machine, and clarified about the performance evaluation. Moreover, closed-packed hexagonal lattice metal, such as magnesium and titanium, is frequently used for assisted living instruments or medical implants. In this research, fatigue crack propagation tests of magnesium alloy AZ31B and pure titanium TP340C were conducted under conditions of biaxial and uniaxial loading by using a cruciform specimen in a bi-axial fatigue machine, in order to investigate the effect of non-singular stress cycling on the fatigue crack growth properties ⊿K-da/dN. From these comprehensive experiments, in the magnesium alloy, the re-markable effect was found in the specific biaxial load stress ratio on ⊿K-da/dN relation. When biaxial load stress ratio was 0.5, it turned out that the fatigue crack propagation rate of a magnesium alloy becomes very slow. On the other hand, in the titanium, it was confirmed that there is a little influence of a biaxial load stress ratio on ⊿KⅠ -da/dN relation.

Influence of Stress Ratio on Fatigue Crack Propagation in TiAl Alloy

2013 ◽  
Vol 457-458 ◽  
pp. 7-10 ◽  
Author(s):  
Rui Cheng Feng ◽  
Zhi Yuan Rui ◽  
Yan Rui Zuo ◽  
Guo Tao Zhang ◽  
Chang Feng Yan
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Stress Ratio ◽  
Tial Alloy ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Fatigue Crack Propagation Rate ◽  
Stress Ratios ◽  
Region Ii

Based on the experiments did by B.K.Parida and T.Nicholas [1], the fatigue crack propagation rate of TiAl alloy under different stress ratios had been tested in order to find out the role of stress ratio and to derive an improved fatigue crack propagation formula for region II(the expansion region) according to Paris formula and to calculate the specific values of the constants in the formula. The experimental results reveal that stress ratio has a significant influence on fatigue crack growth rate.

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