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J Nucl Mater, 2004, 326: 195-200. [4] DENG Aiming, YANG Hongya, LI Yuanrui, et al. Low-cycle fatigue of thin-walled tube of Ti alloy in high temperature environment[J]. Journal of University of Science and Technology Beijing, 2001, 23: 71-72(in Chinese). [5] H. Y. Sun, L. Xiao, J. Sun, P. Ge. 5Zr alloy at 298 and 673 K[J]. Materials Science and Engineering: A, Volume 527, Issue 15, 15 June 2010, Pages 3493-3500. M. Y. R. LI. Low-cycle fatigue of thin-walled tube of Ti alloy in high temperature environment[J].

If the valve input pressure is pm , the valve output pressure is pb ,and the relief valve is 0. The duty ratio of valve is D , the density of the hydraulic oil is ρ , the flow coefficient is C , the max area of valve port is A ,the average is calculated as: ∼ 2 2 (1) Q = DCA ( p − p ) − (1 − D)CA p m ρ b If the coordinates point is is calculated as: ρ b ( D, P ) , the average flow through the valve after linearization at this point (2) ∼ Q = K q D − Kt P Where Kq is the flow coefficient gain, Kc is pressure flow coefficient.

2. 2. 3. 6%/s. 6 gives stable cyclic stress-strain curves of the tube specimens and each hysteresis is taken from a stable stress-strain curve in half-life of one failed specimen. The test results show that the special self-invented grips can lead stress-strain cycling smooth for the small tubes at elevated temperatures. 4. 8. Evidently, 2Nf ~∆ε/2 curves of Zr-1Nb and Zr-4 are closed with each other, and the fatigue life of N18 turns to be short due to elevated temperature. 3 was used to describe relation between 2Nf and ∆ε/2 of the zircaloys.

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Advances in Material Engineering and Mechanical Engineering by Edited by Liang Gao


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