2D Finite Element Simulation of the Cracking Network Propagation in Four-Point Bending


CF.Perrin a,b*, N.Haddarb, A. Fissolob, V.Maillotc
E-mail : fabien.perrin@centrale-lille.net (* corresponding author)

a Ecole Centrale de Lille - Cité Scientifique BP 48, 59651 Villeneuve d'Ascq, France
b CEA-DEN-SEMT-LISN Commissariat ŕ l'Energie Atomique - Saclay, 91191 Gif sur Yvette cedex, France
c CEA-DEN-SRMA-LC2M Commissariat ŕ l'Energie Atomique - Saclay, 91191 Gif sur Yvette cedex, France



Various components of nuclear reactors are subjected to strong fluctuations of temperature. This loading may induce surface cracking networks. Such damages have been observed in reactor heat removal system (RHRS) of Pressurized Water Reactors (PWRs). This study investigates the stability of cracking networks under an additional mechanical loading for the AISI 304-L type stainless steel. The propagation of cracking networks in four-point bending is numerically simulated. First, the appropriate kind of support is determined. Then, propagations of parallel band cracks networks and real cracks networks are simulated in four-point bending controlled either by load or displacement. Numerical results are relatively in good agreement with previous experiments. At the beginning of the propagation, simulations show a strong shielding effect between neighbour cracks and a slight mixed mode. After this first stage, the shielding effect is continuously decreasing.#.

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