scholarly journals J-Integral Approach to Fatigue Crack Propagation in Vulcanized Natural Rubber

2003 ◽  
Vol 69 (680) ◽  
pp. 758-765
Author(s):  
Keisuke TANAKA ◽  
Yoshiaki AKINIWA ◽  
Hirohisa KIMACHI ◽  
Kazuyuki ITOH
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Natural Rubber ◽  
Fatigue Crack Propagation ◽  
Integral Approach ◽  
J Integral

Application of J-Integral to High-Temperature Crack Propagation: Part II—Fatigue Crack Propagation

1979 ◽  
Vol 101 (2) ◽  
pp. 162-167 ◽  
Author(s):  
Shuji Taira ◽  
Ryuichi Ohtani ◽  
Tomio Komatsu
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Large Scale ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Integral Approach ◽  
Fatigue Crack Propagation Rate ◽  
J Integral ◽  
Creep Crack

On the basis of the successful results of our previous study on a J-integral approach to the creep crack propagation of steels, the applicability of the creep J-integral to the time dependent fatigue crack propagation in creep range was studied. A satisfactory correlation was obtained between crack propagation rate and creep J-integral, and the same correlation was found in creep crack propagation under constant load as well as two-step loading. It was also found that the cycle dependent fatigue crack propagation rate could be successfully correlated by the cyclic J-integral. The high crack propagation rate in large scale yielding fatigue may be in agreement with the straight line extrapolation on log-log plots of the linear elastic fatigue crack propagation rate versus cyclic J-integral data.

scholarly journals Improvement of a Cycle J Integral for CT-Specimens

1985 ◽  
Author(s):  
Liu Shao-Lun ◽  
Xie Ji-Zhou
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Integral Formula ◽  
J Integral ◽  
Application Range

The cycle J integral formula for CT-specimens has been improved as follows Δ J = 2 B b a 1 • U + a 2 • Δ δ + 2 B b U e { -1.2025 a w + 0.6233 0.3 ⩽ a w ⩽ 0.53 -0.02 Sin ⁡ π 0.23 a w - 0.53 0.53 < a w < 0.95 This formula is applicable to the fatigue crack propagation range of 0.3 ≤a/w<0.95. In comparision with other formulae of cycle J integral, the application range of the above expression is enlarged and its precision is also increased to a certain extent.

Improvement of a Cycle J Integral for CT Specimens

1986 ◽  
Vol 108 (3) ◽  
pp. 521-524 ◽  
Author(s):  
Shao-Lun Liu ◽  
Ji-Zhou Xie
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Integral Formula ◽  
J Integral ◽  
Application Range

The cycle J integral formula for CT specimens has been improved as follows: ΔJ=(2/Bb)(α1•U + α2•ΔP•Δδ) + (2/Bb)Ue−1.2025a/w + 0.6233 for 0.3≤a/w≤0.53; ΔJ=(2/Bb)(α1•U + α2•ΔP•Δδ) + (2/Bb)Ue−0.02 sin[(π/0.23)(a/w−0.53)] for 0.53<a/w<0.95. This formula is applicable to the fatigue crack propagation range of 0.3≤a/w<0.95. In comparison with other formulae of the cycle J integral, the application range of the above expression is enlarged and its accuracy is also increased to a certain extent.

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