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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (3): 889-897.doi: 10.7527/S1000-6893.2014.0265

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

Test method of failure mechanism consistency based on degradation model

WANG Haowei1, XU Tingxue1, WANG Weiya2   

  1. 1. Department of Ordnance Science and Technology, Naval Aeronautical and Astronautical University, Yantai 264000, China;
    2. Department of Command, Naval Aeronautical and Astronautical University, Yantai 264000, China
  • Received:2014-03-12 Revised:2014-09-18 Online:2015-03-15 Published:2015-03-31
  • Supported by:

    National Natural Science Foundation of China (61273058)

Abstract:

An effective accelerated test must guarantee that the failure mechanism is unchanged. According to the features of reliability modeling under accelerated degradation test (ADT), a test method of failure mechanism consistency based on degradation model is proposed. Taking the degradation models based on stochastic process and degradation path fitting as examples, the inner connection between model parameters and failure mechanism consistency is constructed through two equivalent definitions of acceleration factor. Furthermore, the relationships which should be satisfied at different stresses are deduced. Then t statistic is utilized to test the consistency of samples on the basis that samples are assumed following a normal distribution. Two ADT cases are provided to validate the rationality of the proposed method.

Key words: reliability, failure mechanism consistency, degradation model, acceleration coefficient, t statistic

CLC Number: