Dissipative aspects in thermographic methods
Article first published online: 13 JUN 2012
© 2012 Wiley Publishing Ltd.
Fatigue & Fracture of Engineering Materials & Structures
Volume 35, Issue 12, pages 1133–1147, December 2012
How to Cite
CURÀ, F., GALLINATTI, A. E. and SESANA, R. (2012), Dissipative aspects in thermographic methods. Fatigue & Fracture of Engineering Materials & Structures, 35: 1133–1147. doi: 10.1111/j.1460-2695.2012.01701.x
- Issue published online: 20 NOV 2012
- Article first published online: 13 JUN 2012
- Received in final form 04 April 2012
- fatigue limit evaluation;
- infrared thermography;
Object of this paper is to emphasize some dissipative aspects of steels in high cycle fatigue from the thermographic point of view by relating anelastic and microplastic behaviours to loading levels respectively below and above the fatigue limit. To this aim, the Two Curves Thermographic Method has been modified by using both a parabola and a power curve as regression laws instead of the traditional linear ones. Two new thermal parameters have also been considered, the thermal increment and the subtended area by the thermal profile at a very low number of cycles. Experimental data referred to C45 standard and 25CrMo4 notched steel specimens have been processed using both original and modified Two Curves methodologies and both traditional and new thermographic parameters. All changes introduced in the present paper provide good results both in terms of fatigue limit values and for as concerns the rapidity of the fatigue tests.