Scale effects have been observed during the ductile rupture of two widely different stells: a plain carbon steel containing MnS inclusions and a cast ferrite - austenite duplex stainless steel. These observations raise the problem of transferability of data obtained on laboratory specimens to relatively large industrial components. This work presents finite element simulations, accounting for experimentally measured material heterogeneities (inclusion local concentration or local damage rate, ...), which allow to predict both scatter band width and size efefcts. Using the same technique, it is alos confirmed that heterogeneities significantly reduces the ductility.
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