Constitutive model for flake graphite cast iron automotive brake discs: induced anisotropic damage model under complex loadings

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• 作者：L. Augustins ; R. Billardon ; F. Hild
• 刊名：Continuum Mechanics and Thermodynamics
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：28
• 期：5
• 页码：1445-1460
• 全文大小：1,530 KB
• 刊物类别：Engineering
• 刊物主题：Theoretical and Applied Mechanics
  Engineering Thermodynamics and Transport Phenomena
  Mechanics, Fluids and Thermodynamics
  Structural Materials
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0959
• 卷排序：28

文摘

The present paper details an elasto-viscoplastic constitutive model for automotive brake discs made of flake graphite cast iron. In a companion paper (Augustins et al. in Contin Mech Thermodyn, 2015), the authors proposed a one-dimensional setting appropriate for representing the complex behavior of the material (i.e., asymmetry between tensile and compressive loadings) under anisothermal conditions. The generalization of this 1D model to 3D cases on a volume element and the associated challenges are addressed. A direct transposition is not possible, and an alternative solution without unilateral conditions is first proposed. Induced anisotropic damage and associated constitutive laws are then introduced. The transition from the volume element to the real structure and the numerical implementation require a specific basis change. Brake disc simulations with this constitutive model show that unilateral conditions are needed for the friction bands. A damage deactivation procedure is therefore defined.KeywordsFlake graphite cast ironConstitutive modelBrake discsAnisotropic damageDamage deactivation