In the present paper, a micro-mechanical model based on energetic considerations is developed to simulate the effect of environmental temperature on the fracture toughness of metallic alloys. By considering a reference elementary volume (REV) with the same composition of the real material, the stress–strain field inside such a volume and the corresponding strain energy due to a temperature variation is determined. The energy balance to determine the material fracture toughness is generalised in order to take into account the temperature effects. The proposed micro-mechanical model is governed by few parameters which can be simply estimated, and allows us to determine the fracture toughness for any temperature below the room temperature. Such a model is applied to three metallic alloys which show a ductile–brittle transition temperature: ASTM A471, Carbon Steel D6ac, Steel S275 J2. From the comparison of theoretical results with experimental data, it can be concluded that the model seems to be able to correctly predict the fracture toughness at low temperatures.

A micromechanical model for the prediction of the temperature fracture behaviour dependence in metallic alloys / CARPINTERI, Andrea; BRIGHENTI, Roberto; ALAN DAVOLI; VANTADORI, Sabrina. - In: ENGINEERING FRACTURE MECHANICS. - ISSN 0013-7944. - 75:(2008), pp. 3646-3662. [10.1016/j.engfracmech.2007.09.009]

A micromechanical model for the prediction of the temperature fracture behaviour dependence in metallic alloys

BRIGHENTI, Roberto;
2008

Abstract

In the present paper, a micro-mechanical model based on energetic considerations is developed to simulate the effect of environmental temperature on the fracture toughness of metallic alloys. By considering a reference elementary volume (REV) with the same composition of the real material, the stress–strain field inside such a volume and the corresponding strain energy due to a temperature variation is determined. The energy balance to determine the material fracture toughness is generalised in order to take into account the temperature effects. The proposed micro-mechanical model is governed by few parameters which can be simply estimated, and allows us to determine the fracture toughness for any temperature below the room temperature. Such a model is applied to three metallic alloys which show a ductile–brittle transition temperature: ASTM A471, Carbon Steel D6ac, Steel S275 J2. From the comparison of theoretical results with experimental data, it can be concluded that the model seems to be able to correctly predict the fracture toughness at low temperatures.
2008
75
3646
3662
CARPINTERI, Andrea; BRIGHENTI, Roberto; ALAN DAVOLI; VANTADORI, Sabrina
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1328138
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