In this paper, finite element model of a shaft-disk system is developed to investigate the nonlinear breathing behavior of transverse cracks in terms of crack location and rotation speed. The crack model is built using the released strain energy concept in fracture mechanics. Zero Stress Intensity Factor (SIF) method is employed to determine the crack closure line at each time step by calculating the stress intensity factor of opening mode for prescribed resolutions in crack area. The stiffness matrix is updated every time step by integrating compliant coefficients over instantly calculated crack open area. With the finite element model of rotor system, the breathing behavior of cracks is explored as a function of eccentricity phase under different rotation speeds. The coupling of lateral, longitudinal and torsional vibration is studied in time and frequency domain, which may indicate the existence of damage.

Date Published: 23 March 2015
PDF: 9 pages
Proc. SPIE 9438, Health Monitoring of Structural and Biological Systems 2015, 94380F (23 March 2015);

Published in SPIE Proceedings Vol. 9438:
Health Monitoring of Structural and Biological Systems 2015
Tribikram Kundu, Editor(s)