Journal
ENGINEERING FAILURE ANALYSIS
Volume 131, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfailanal.2021.105805
Keywords
Fatigue-oxidation-creep damage; Non-proportional hardening; Elastic-viscoplastic; Notch; Multiaxial loading
Funding
- National Natural Science of China [51535001, 11572008, 11672010]
- Engineering and Physical Sciences Research Council (EPSRC) UK [EP/N509991/1]
- China Scholarship Council (CSC)
- CSC
- EPSRC [EP/N509991/1] Funding Source: UKRI
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A new life assessment framework is proposed based on elastic-viscoplastic modeling and damage behavior for structural components under multiaxial nonproportional loading at high temperature. The framework utilizes a viscoplastic constitutive model to capture non-proportional hardening effect and a damage model to assess failure life comprehensively. Evaluation of the framework at 650 degrees C shows errors within a factor of 2 under proportional and non-proportional fatigue loadings.
In this paper, a new life assessment framework is proposed based on the elastic-viscoplastic modeling and the damage behavior for the structural component under multiaxial nonproportional loading at high temperature. The viscoplastic constitutive model with the ability to capture the non-proportional hardening effect is used to obtain the stress-strain fields, in which a new method based on the rotation of strain axis is proposed to evaluate the notch rotation factor. The damage model, which can comprehensively capture the multiaxial fatigue-oxidationcreep behaviors, is used to assess the failure life. In addition, the proposed framework is evaluated by the life results under proportional and non-proportional fatigue loadings at 650 degrees C, and the errors are found to be within a factor of 2.
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