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RISS 인기검색어
- 검색키워드
- 저자 : Pu Ning Jiang (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Crack-tip constraint analysis of two collinear cracks under creep condition
Guang-Chen Jiao,Wei-Zhe Wang,Pu-Ning Jiang 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.43 No.3
The higher-order asymptotic C(t) − A2(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) − A2(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) − A2(t) approach,respectively. With increasing the creep time, the constraint A2 was exponentially increased in the smallscale creep stage, while no discernible dependency of the constraint A2 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) − A2(t) approach. In comparison with the HRR-type field, the higher-order asymptotic C(t) − A2(t) solution matches well with the finite element results for the collinear crack model.
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Crack-tip constraint analysis of two collinear cracks under creep condition
Jiao, Guang-Chen,Wang, Wei-Zhe,Jiang, Pu-Ning Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.43 No.3
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.
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Influence of rub groove on rotordynamics associated with leakage air flow through a labyrinth seal
Wei Zhe Wang,Ying Zheng Liu,Guang Meng,Pu Ning Jiang 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.8
An extensive investigation of influence of rub grooves on dynamics and stability of the rotor, which is subjected to aerodynamic forcing associated with the leakage flow through 44 straight-through seals, was performed by using numerical calculations based on the single control-volume method and the perturbation analysis. Three cases of different groove configurations were chosen for the comparative study, e.g., the seal without rub groove (case1), the seal with upstream shifting of the seal tooth in respect to the rub groove (case2) and the seal with location of the seal tooth in the middle station of the rub groove (case3). The orifice contract coefficient adopted in reduction of rotordynamic coefficients was provided by using Computational Fluid Dynamics (CFD). Influence of rub grooves on the leakage flow was obtained in terms of the close-up view of the flow pattern near the seal tooth, leakage flow rate, distributions of the mean pressure and circumferential velocity in cavities. In comparison to case 1, the leakage flow in case 3 is considerably intensified, while which in case 2 is slightly increased. Dynamics and instability of the rotor in all cases was discussed in terms of the rotordynamic coefficients and the logarithmic decrement, respectively. The results disclosed that the aerodynamic forcing in case 2 intensified the destabilization of the rotor system.
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