Damage development of Inconel 718 due to laboratory simulated creep (original) (raw)
2018, Journal of Theoretical and Applied Mechanics
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On the Creep Crack Growth Behaviour of Inconel 718
IASMiRT, 2005
In this paper CCG behaviour of Inconel 718 is investigated by means of numerical simulations of some preliminary Creep Crack Growth (CCG) experimental tests. At first, a criterion of crack length versus time is given to control the crack growth; the crack is assumed to growth constantly from the experimental initial value to the final one, under the external load, according to the experimental results of CCG tests. Then a damage variable, based on the equivalent (von Mises) creep strain rate and the Cocks and Asbhy void growth model, is used to predict CCG. The creep behavior of the material is described by a secondary creep law using the creep properties obtained by creep tests previously carried out on the same material. The development of the creep zone is observed and the load line displacement is compared with the experimental one. In the case of simulation based on a damage variable also the crack growth is calculated and compared with the crack growth measured experimentally.
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