Abstract
A simple model is developed for the calculation of dynamic stress intensity factors for lengthwise cracked beams subjected to impact or transient loading. The model is based on a Global/Local approach that separates the Global structural dynamics from the Local crack tip zone dominated by singular stresses. The Global model is that of connected waveguides while the Local model is based on a novel application of the J-integral that converts dynamic structural resultants directly into strain energy release rate. The accuracy of this approach is assessed by comparing it to a fully two-dimensional finite element analysis in which the modified crack closure integral is used to calculate the dynamic strain energy release rate. Both mode I and mode II examples are given, and situations with multiple wave reflections are emphasized.
Similar content being viewed by others
References
T.N.Farris and J.F.Doyle, International Journal of Fracture 50 (1991) 131–141.
J.F. Doyle, T.N. Farris and H.M. Ledington, in Proceedings of the International Conference on Photomechanics and Speckle Metrology, SPIE 814, San Diego, CA, August (1987) 655–661.
J.F. Doyle, T.N. Farris and H.M. Ledington, in Proceedings of the 6th International Congress on Experimental Mechanics, SEM, Portland, Oregon, June (1988) 1253–1260.
T.N.Farris and J.F.Doyle, Journal of Sound and Vibration 130, No. 1 (1989) 137–147.
J.F. Doyle and T.N. Farris, in Proceedings of the 1990 SEM Spring Conference on Experimental Mechanics, Albuquerque, New Mexico, June (1990) 27–33.
E.F.Rybicki and M.F.Kanninen, Engineering Fracture Mechanics 9 (1977) 931–938.
C.J.Jih and C.T.Sun, Engineering Fracture Mechanics 37 (1990) 313–322.
J.G.Williams, International Journal of Fracture 36 (1988) 101–119.
Y.Xia and C.Ruiz, International Journal of Fracture 48 (1991) 205–218.
B.V.Sankar and J.Hu, Journal of Composite Materials 25 (1991) 1414–1426.
PLADYN: a program for the Static and Dynamic Analysis of Flat Plates, Ikayex Software Tools, Lafayette, IN (1992).
SPECDYN: Spectral analysis for the dynamics of framed structures, Ikayex Software Tools, Lafayette, IN (1989).
J.F.Doyle and T.N.Farris, International Journal of Analytical and Experimental Modal Analysis 5 (1990) 223–237.
J.F.Doyle, Wave Propagation in Structures, Springer-Verlag, New York (1989).
S.N.Atluri, Computational Methods in the Mechanics of Fracture, North-Holland, New York (1986) 121–165.
M.H.El-Haddad, D.M.Ramadan and R.R.Bazaraa, International Journal of Fracture 45 No. 2 (1990) 81–102.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Farris, T.N., Doyle, J.F. A Global/Local approach to lengthwise cracked beams: dynamic analysis. Int J Fract 60, 147–156 (1993). https://doi.org/10.1007/BF00012442
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00012442