Journal Published Online: 28 August 2014
Volume 4, Issue 2

Hold-Time Effect on Thermo-Mechanical Fatigue Life and its Implications in Durability Analysis of Components and Systems



Thermo-mechanical fatigue (TMF) resistance of engineering materials is extremely important for the durability and reliability of components and systems subjected to combined thermal and mechanical loadings. However, TMF testing, modeling, simulation, validation, and the subsequent implementation of the findings into product design are challenging tasks because of the difficulties not only in testing but also in results interpretation and in the identification of the deformation and failure mechanisms. Under combined high-temperature and severe mechanical loading conditions, creep and oxidation mechanisms are activated and time-dependent failure mechanisms are superimposed to cycle-dependent fatigue, making the life assessment very complex. In this paper, the testing procedures and results for high-temperature fatigue testing using flat specimens and thermal-fatigue testing using V-shape specimens are reported; emphasis is given to hold-time effects and the possible underlying mechanisms. The uncertainty nature and the probabilistic characteristics of the V-shape specimen test data are also presented. Finally, the impact of hold-time effect on current product design and validation procedure is discussed in terms of virtual life assessment.

Author Information

Wei, Zhigang
Tenneco Inc., Grass Lake, MI, US
Luo, Limin
Tenneco Inc., Grass Lake, MI, US
Lin, Burt
Tenneco Inc., Grass Lake, MI, US
Yang, Fulun
Tenneco Inc., Grass Lake, MI, US
Konson, Dmitri
Tenneco Inc., Grass Lake, MI, US
Ellinghaus, Kay
Tenneco GmbH, Edenkoben, DE
Pieszkalla, Markus
Tenneco GmbH, Edenkoben, DE
Avery, Katherine
Univ. of Michigan, Ann Arbor, MI, US
Pan, Jwo
Univ. of Michigan, Ann Arbor, MI, US
Engler-Pinto, Carlos
Ford Motor Company, Dearbon, MI, US
Pages: 20
Price: $25.00
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Stock #: MPC20140032
ISSN: 2165-3992
DOI: 10.1520/MPC20140032