The existence of a circumferential or axial crack in the curved wall of a structure can greatly affect the free and forced vibration characteristics of the structure. Pipelines and nuclear reactor vessels are examples of structures which could easily be subjected to time-dependent loads in earthquakes and/or explosions. A knowledge of the effect of a crack on the dynamical behavior of such structures is essential if the integrity of the structure is to be guaranteed. These systems and many others can be represented reasonably well by a circular cylindrical shell. The present paper deals with the dynamic response of a thin, finite, elastic circular cylindrical shell to time-dependent loadings such as in earthquakes and/or explosions symmetric with respect to the axis of the cylinder. For a particular time-dependent loading, extensive numerical results are obtained for dynamic stress intensity factors in aluminum and steel pressure vessels. It is shown that the dynamical stresses exhibit a square root singularity which is also characteristic of elastostatic crack problems. All the stress intensity factors (bending and membrane), except one, exhibit the same general trend. They first decrease from their corresponding static value and then begin to increase.
Dynamic analysis of cracked pipes in earthquakes
1999
9 Seiten, 9 Quellen
Aufsatz (Konferenz)
Englisch
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