Strain-life approach in thermo-mechanical fatigue evaluation of complex structures

ABSTRACT 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 mu...

Full description

Saved in:

Bibliographic Details
Published in:	Fatigue & fracture of engineering materials & structures Vol. 30; no. 9; pp. 808 - 822
Main Authors:	ROSA, UROŠ, NAGODE, MARKO, FAJDIGA, MATIJA
Format:	Journal Article
Language:	English
Published:	Oxford, UK Blackwell Publishing Ltd 01-09-2007 Blackwell Science Wiley Subscription Services, Inc
Subjects:	Applied sciences Damage damage accumulation elastoplasticity Engineering research Exact sciences and technology Fatigue Fatigue failure Finite element analysis Finite element method Interpolation Low cycle fatigue Materials fatigue Mathematical models Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology Metals. Metallurgy Strain Stress-strain relationships Stresses Structural engineering Temperature effects thermo-mechanical fatigue Finite element method damage accumulation Fatigue life thermo- mechanical fatigue Elastoplasticity Mechanical properties Fatigue Cumulative damage finite element analysis Modeling Thermomechanical stress
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	ABSTRACT 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 developed Damage 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 Skelton's 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.
Bibliography:	ArticleID:FFE1154 istex:EF3148E6712D1F50BD5C412013BCF14BE4A94687 ark:/67375/WNG-FVKQFR24-M ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	8756-758X 1460-2695
DOI:	10.1111/j.1460-2695.2007.01154.x