Strain-life approach in thermo-mechanical fatigue evaluation of complex structures
Rosa, Uroš (Author), Nagode, Marko (Author), Fajdiga, Matija (Author)

URLURL - Presentation file, Visit http://dx.doi.org/10.1111/j.1460-2695.2007.01154.x This link opens in a new window

This paper is a contribution to strain-life approach evaluation of thermo-mechanically loaded structures. It takes into consideration the uncoupling of stress and damage evaluation and has the option of importing non-linear or linear stress results from finite element analysis (FEA). The multiaxiality is considered with the signed von Mises method. In the developedDamage Calculation Program (DCP) local temperature-stress-strain behaviour is modelled with an operator of the Prandtl type and damage is estimated by use of the strain-life approach and Skeltonćs energy criterion. Material data were obtained from standard isothermal strain-controlled low cycle fatigue (LCF) tests, with linear parameter interpolation or piecewise cubic Hermite interpolation being used to estimate values at unmeasured temperature points. The model is shown with examples of constant temperature loading and random force-temperature history. Additional research was done regarding the temperature dependency of the Kp used in the Neuber approximate formula for stress-strain estimation from linear FEA results. The proposed model enables computationally fast thermo-mechanical fatigue (TMF) damage estimations for random load and temperature histories.

Keywords:termomehansko utrujanje, akumuliranje poškodb, elastoplastičnost, analize končnih elementov, damage accumulation, elastoplasticity, thermomechanical fatigue, finite element analysis
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Number of pages:str. 808-822
Numbering:Letn. 30, št. 9
ISSN on article:8756-758X
COBISS.SI-ID:10087195 Link is opened in a new window
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Record is a part of a journal

Title:Fatigue & fracture of engineering materials & structures
Shortened title:Fatigue fract. eng. mater. struct.
Publisher:Blackwell Publishing
COBISS.SI-ID:584210 This link opens in a new window

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