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http://dx.doi.org/10.12989/sem.2012.43.3.311

Crack-tip constraint analysis of two collinear cracks under creep condition  

Jiao, Guang-Chen (Key Lab of Education Ministry of China for Power Machinery and Engineering, Shanghai Jiao Tong University)
Wang, Wei-Zhe (Key Lab of Education Ministry of China for Power Machinery and Engineering, Shanghai Jiao Tong University)
Jiang, Pu-Ning (Key Lab of Education Ministry of China for Power Machinery and Engineering, Shanghai Jiao Tong University)
Publication Information
Structural Engineering and Mechanics / v.43, no.3, 2012 , pp. 311-320 More about this Journal
Abstract
The higher-order asymptotic C(t) - $A_2(t)$ approach was employed to investigate the crack-tip stress of two collinear cracks in a power-law creeping material under the plane strain conditions. A comprehensive calculation was made of the single crack, collinear crack model with S/a = 0.4 and 0.8, by using the C(t) - $A_2(t)$ approach, HRR-type field and the finite element analysis; the latter two methods were used to check the constraint significance and the calculation accuracy of the C(t) - $A_2(t)$ approach, respectively. With increasing the creep time, the constraint $A_2$ was exponentially increased in the small-scale creep stage, while no discernible dependency of the constraint $A_2$ on the creep time was found at the extensive creep state. In addition, the creep time and the mechanical loads have no distinct influence on accuracy of the results obtained from the higher-order asymptotic C(t) - $A_2(t)$ approach. In comparison with the HRR-type field, the higher-order asymptotic C(t) - $A_2(t)$ solution matches well with the finite element results for the collinear crack model.
Keywords
constraint; creep; plane strain; interacting cracks; C(t) - $A_2(t)$ approach;
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