Crack Modelling for Structural Health Monitoring

MI Friswell (University of Wales Swansea) & JET Penny (Aston University)

Structural Health Monitoring: An International Journal, Vol. 1, No. 2, October 2002, pp. 139-148


There are a number of approaches to the modeling of cracks in beam structures reported in the literature, that fall into three main categories; local stiffness reduction, discrete spring models, and complex models in two or three dimensions. This paper compares the different approaches to crack modeling, and demonstrates that for structural health monitoring using low frequency vibration, simple models of crack flexibility based on beam elements are adequate. This paper also addresses the effect of the excitation for breathing cracks, where the beam stiffness is bilinear, depending on whether the crack is open or closed. Most structural health monitoring methods assume that the structure is behaving linearly, whereas in practice the response will be non-linear to an extent that varies with the form of the excitation. This paper will demonstrate these effects for a simple beam structure.

Paper Availability

This material has been published in the International Journal of Structural Health Monitoring Vol. 1, No. 2, October 2002, pp. 139-148, the only definitive repository of the content that has been certified and accepted after peer review. The copyright has been assigned to Sage Publications.

Link to paper using doi: 10.1177/1475921702001002002

Structural Health Monitoring: An International Journal