Time dependent dc resistance degradation in lead-based perovskites: 0.7 Pb(Mg1/3Nb2/3)O3−0.3 PbTiO3

2009 ◽  
Vol 105 (5) ◽  
pp. 053705 ◽  
Author(s):  
S. Zhao ◽  
S. J. Zhang ◽  
W. Liu ◽  
N. J. Donnelly ◽  
Z. Xu ◽  
...  
Keyword(s):  
Time Dependent ◽  
Resistance Degradation ◽  
Dc Resistance

Research on resistance degradation and reliability of pre-stressed concrete structures in freeze-thaw zone

2018 ◽  
Vol 9 (4) ◽  
pp. 442-454
Author(s):  
Jinliang Liu ◽  
Yanmin Jia ◽  
Guanhua Zhang ◽  
Jiawei Wang
Keyword(s):  
Service Life ◽  
Structural Reliability ◽  
Concrete Structures ◽  
Calculation Model ◽  
Time Dependent ◽  
Content Type ◽  
Freeze Thaw ◽  
Remaining Service Life ◽  
Resistance Degradation ◽  
Thaw Zone

Purpose In the freeze-thaw zone, the pre-stressed concrete of bridge structure will be damaged by freezing-thawing, the bearing capacity of structure will decrease and the safety will be affected. The purpose of this paper is to establish the time-dependent resistance degradation model of structure in the freeze-thaw zone, and analysis the structural reliability and remaining service life in different freeze-thaw zones. Design/methodology/approach First, according to the theory of structural design, a calculation model of the resistance of pre-stressed concrete structures in f freeze-thaw zone is established. Second, the time-dependent resistance model was verified by the test beam bending failure test results done by the research group, which has been in service for 20 years in freeze-thaw zone. Third, using JC algorithm in MATLAB to calculate the index on the reliability of pre-stressed concrete structure in frozen thawed zones, forecasting the s remaining service life of structure. Findings First, the calculation model of the resistance of pre-stressed concrete structures in freeze-thaw zone is accurate and it has excellent applicability. Second, the structural resistance deterioration time in Wet-Warm-Frozen Zone is the earliest. Third, once the pre-stressed reinforcement rusts, the structural reliability index will reach limit value quickly. Finally, the remaining service life of structure meets the designed expectation value only in a few of freeze-thaw zones in China. Originality/value The research will provide a reference for the design on the durability of a pre-stressed concrete structure in the freeze-thaw zone. In order to verify the security of pre-stressed concrete structures in the freeze-thaw zone, engineers can use the model presented in this paper for durability checking, it has an important significance.

scholarly journals Polarity dependent DC resistance degradation and electrical breakdown in Nb doped PZT films

APL Materials ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 120901 ◽  
Author(s):  
Betul Akkopru-Akgun ◽  
Wanlin Zhu ◽  
Clive A. Randall ◽  
Michael T. Lanagan ◽  
Susan Trolier-McKinstry
Keyword(s):  
Electrical Breakdown ◽  
Pzt Films ◽  
Resistance Degradation ◽  
Dc Resistance

Leakage current characteristics and DC resistance degradation mechanisms in Nb doped PZT films

2021 ◽  
Vol 129 (17) ◽  
pp. 174102
Author(s):  
Betul Akkopru-Akgun ◽  
Thorsten J. M. ◽  
Kosuke Tsuji ◽  
Ke Wang ◽  
Clive A. Randall ◽  
...  
Keyword(s):  
Leakage Current ◽  
Degradation Mechanisms ◽  
Pzt Films ◽  
Resistance Degradation ◽  
Current Characteristics ◽  
Dc Resistance

scholarly journals Time-dependent reliability of (weighted) k-out-of-n systems with identical component deterioration

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Cao Wang
Keyword(s):  
System Performance ◽  
Reliability Assessment ◽  
Logic Model ◽  
Time Dependent ◽  
Civil Infrastructure ◽  
Infrastructure Systems ◽  
Mathematical Solution ◽  
Special Cases ◽  
Powerful Approach ◽  
Resistance Degradation

AbstractThe performance of civil infrastructure systems is vital in supporting a community’s functionalities. Reliability assessment of these systems is a powerful approach to evaluate whether the system performance is desirably safe under the impacts of resistance degradation and non-stationary loads. A k-out-of-n system is a widely-used logic model for a system with n components, which survives (works) if at least k components work. Its special cases include a series or a parallel system. Furthermore, a weighted k-out-of-n system has components with positive integer weights and the system survives if the total weight of working components reaches the predefined threshold k. This paper proposes a method for estimating the time-dependent reliability of both ordinary and weighted k-out-of-n systems, taking into account the effects of resistance deterioration, resistance correlation and load non-stationarity, for which a mathematical solution is derived. The applicability of the proposed method is illustrated through reliability evaluation of a representative k-out-of-n system.

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