A load spectra design method for multi-stress accelerated testing

Zhonghai Ma, Songlin Nie, Haitao Liao

Research output: Contribution to journalArticlepeer-review


Accelerated testing (AT) is an effective testing method for evaluating the reliability of highly reliable products. In many applications, such products are often subject to multiple stresses in actual working environments. Then, how to design the load spectra for multi-stress AT becomes a critical issue. In this paper, a new load spectra design method is proposed to overcome this challenge. Considering the properties of multiple stresses, a novel multi-stress loading matrix (MSLM) is modified to fully describe the load spectra in actual working environments and to generate the corresponding load spectra for AT. For illustration purposes, an inverse Gaussian (IG) process incorporating life-stress relationships is adopted to model product degradation under multiple stresses. A case study on a type of hydraulic piston pump is provided to demonstrate the use of the proposed method in guiding the load spectra design for multi-stress AT.

Original languageEnglish (US)
Pages (from-to)994-1006
Number of pages13
JournalProceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability
Issue number6
StatePublished - Dec 2022
Externally publishedYes


  • Accelerated testing
  • inverse Gaussian process
  • load spectra
  • multiple stresses

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality


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