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首页> 外文期刊>International Journal of Solids and Structures >Micromechanical modeling of ductile cast iron incorporating damage. Part I: Ferritic ductile cast iron
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Micromechanical modeling of ductile cast iron incorporating damage. Part I: Ferritic ductile cast iron

机译：球墨铸铁的微机械建模，包括损伤。第一部分：铁素体球墨铸铁

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摘要

The market for ductile cast iron as a substitute material increases every year. The material structural performance is strongly dependent on the microstructure. Micromechanics can help in understanding the role played by the microstructure constituents as well as the effects associated to the shape of the spheroids, their density, surface roughness, etc. The potential of application for micromechanics modeling can be further increased if features such damage mechanics and residual stresses are incorporated. In this paper, a micromechanics modeling approach based on the unit cell development has been developed paying particular attention to the role and the behavior of the constituents. Residual stresses, resulting from the cooling down to room temperature, have been demonstrated to be critical for an accurate prediction of the non-linear behavior of the DCI in the early deformation range. As far as damage mechanics is concerned, it has been demonstrated that voids nucleating from debonded spheroids are not sufficient to explain catastrophic failure at the macroscale while the occurrence of additional ductile damage in the matrix material is the driving process for rupture in ferritic DCI. (C) 2004 Elsevier Ltd. All rights reserved.
机译：球墨铸铁作为替代材料的市场每年都在增长。材料的结构性能在很大程度上取决于微观结构。微观力学可以帮助理解微观结构成分的作用，以及与球体形状，密度，表面粗糙度等相关的影响。如果具有这样的破坏力学和破坏特性，则可以进一步提高在微观力学建模中的应用潜力。引入了残余应力。在本文中，已经开发了一种基于晶胞发展的微力学建模方法，特别注意了成分的作用和行为。已经证明，冷却至室温所产生的残余应力对于准确预测DCI在早期变形范围内的非线性行为至关重要。就损伤力学而言，已经证明，从松散的球状体成核的空隙不足以在宏观上解释灾难性故障，而基体材料中其他延性损伤的发生是铁素体DCI破裂的驱动过程。 （C）2004 Elsevier Ltd.保留所有权利。

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