Abstract
The prediction of the behaviour of pressurized cracked thin shells to static or fatigue fracture requires a definition of a crack parameter more general than the stress intensity factors, in order to take into account the local three-dimensional effects of the pressure which causes a local bulging in the cracked area. It is shown that the generalized strain energy release rate derived from an overall energetic balance is a parameter particularly suitable for this problem. Its expression for a non-linear elastic structure is derived and two experimental tests carried out on plates and shells cracked under pressure are described. This proof being obtained, this concept is used in an investigation of sub-structure of a cracked shell in order to estimate this effect of local bulging and to build-up a series of reference results.
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