Accelerated degradation test

Tydeman, M. S., and Kirkwood, T. B. L. (1984), Design and analysis of accelerated degradation tests for the stability of biological standards. I. Properties of maximum likelihood estimators, / Biol. Stand., 12,195-206. 

Comparing to the accelerated life test where only the life distribution under a given stress level is recorded, the accelerated degradation test keeps track of the evolution of a damage metric (Fr), which allows the experimental validation of the correlation approach if the selected damage metric is observable. For example, the projected life distribution under normal stress can sometime... 

Figure 25. Concept of accelerated life and accelerated degradation test T1 and T2 are two stress levels and T3 is the normal stress level PI, P2, and P3 are the life distribution under stress level Tl, T2, and T3.

It must be noted that actual-time testing of proteinaceous reagents is not feasible. While commonly practiced in the pharmaceutical field (15, 16), high-temperature accelerated degradation testing when applied to immunochemicals such as antisera and antibodies can be irrelevant or even misleading (17,18). 

The data available up to now as to the effect of higher temperatures on all these phenomena of degradation and destruction are very limited. Research into these problems needs considerable time. Various accelerated degradation tests that are conducted often lead to ambiguous results. 

The superposition principle to develop the concept of accelerated degradation testing... 

Candidate WHO materials are subjected to accelerated degradation tests (see Section IV for further details) to predict the stability of the material at the temperature of storage. This prediction supplements real-time measurements. 

The precision of estimates of degradation rate from accelerated degradation tests is much improved by ... 

Bae, S.J., Kim, S.-J., Park, J.I., Lee, J.-H., Cho, H., and Park, J.-Y. (2010) Lifetime prediction through accelerated degradation testing of membrane electrode assemblies in direct methanol fuel cells. Int.J. Hydrogen Energy, 35, 9166-9176. Shao, M. (2011) Palladium-based electrocatalysts for hydrogen oxidation and oxygen reduction reactions. J. Power Sources, 196, 2433-2444. 

Fig. 2 Schematic representation of apparatus for the accelerated degradation test.

Ornelas R, Stassi A, Modica E, Arico AS, Antonucci V. Accelerated degradation tests for Pt/C catal5Tsts in sulphuric acid. ECS Transactions 2006 3 633 1. 

ADT accelerated degradation test or accelerated durability test... 

Li, X.-Y, Liu, L., He, B. Jiang, T.-M. 2013. Accelerated Degradation Test and Particle Filter Based Remaining Useful Life Prediction. Chemical Engineering Transactions 33 343-348. 

Liu, X. Tang, L.C. 2010. A Bayesian optimal design for accelerated degradation tests. Quality and Reliability Engineering International 26(8) 863-875. 

Tseng, S.T, Balakrishnan, N. Tsai, C.C. 2009. Optimal Step-Stress Accelerated Degradation Test Plan for Gamma Degradation Processes. IEEE Transactions on Reliability 58(4) 611-618. 

Wang, X.-H., Li, Q.-X. Feng, Y-L 2014 Research of Double Nozzle Flapper Valve Accelerated Degradation Test. Applied Mechanics and Materials 532 18-21. 

Life and reliability evaluation of tuner by Constant-Stress Accelerated Degradation Testing method... 

The Accelerated Degradation Testing (ADT) technology is the effective way to solve this problem. The ADT is not need to observe the occurrence of failure and just need to monitor the changes of specified products performance parameters. Recently, ADT has been successfully applied in many kinds of products, such as direct methanol fuel cells (Bae Suk-Joo et al. 2010), aerospace electrical connector (Chen Wenhua et al. 

Bae Suk-Joo, Kim Seong-Joon, Park Jong, 2010. In Lifetime prediction through accelerated degradation testing of membrane electrode assemblies in direct methanol fuel cells. International Journal of Hydrogen Energy, 35(7) 9166-9176. 

Li Xiao-yang, Jiang Tong-min, 2007. Constant-stress accelerated degradation Testing of Satellite assemblies. Hangkong Xuebao/Acta Aeronautica et Astro-nautica Sinica, 28, 100-103. 

Rong Pan, Taeho Crispin, 2011. A Hierarchical Modeling Approach to Accelerated Degradation Testing Data Analysis A Case Study. Quality and Reliability Engineering International, 27(2) 229-237. 

Wang Fu-Kwun, Chu Tao-Peng, 2012. Lifetime predictions of LED-based light bars by accelerated degradation test. Microelectronics Reliability, 52(7) 1332-1336. 

For space instruments, the accelerated degradation test method is good ways to solve the difficulty of obtain the failure data. There are many literatures about accelerated degradation test and there are two problems we should pay attention to ... 

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