Microstructure-based modelling of cast iron with lamellar graphite inclusions under cyclic plastic loadings

循环塑性载荷下含有层状石墨夹杂物的铸铁的基于微观结构的建模

• 批准号: 199650204
• 负责人: Professor Dr.-Ing. Thomas Seifert
• 金额: --
• 依托单位: Fraunhofer-Institut für Werkstoffmechanik (IWM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/199650204?language=en
• 关键词: Microstructure; based; modelling; cast; iron

Cast iron with lamellar graphite inclusions is used for many components that are exposed to low-cycle fatigue loading conditions. Thus, at highly loaded regions in the components cyclic plasticity occurs. It is the goal of the project to investigate the influence of the microstructure of the graphite on cyclic plasticity of cast iron with lamellar graphite inclusions. To this end, representative volume elements (RVEs) are analysed which are generated from 3D-reconstructions of the real microstructure. For different microstructures of graphite (distribution, size, portion) yield surfaces are numerically computed and their evolution under cyclic loadings is followed. Moreover, the corresponding flow directions are evaluated. The probabilistic nature of the microstructure is allowed for by analyzing, besides RVEs, many smaller, not-representative test volume elements (TVEs) which in their collectivity are statistically representative and allow an analysis of scatter and upper and lower bounds of yield loci. The findings should be used to formulate a material model for cast iron with lamellar graphite inclusions. In the future, it should be possible with this model to take the local material properties into account in the computational component design.

具有层状石墨夹杂物的铸铁用于许多暴露于低周疲劳载荷条件下的部件。因此，在部件的高载荷区域发生循环塑性。本课题的目的是研究石墨显微组织对含片状石墨夹杂铸铁循环塑性的影响。为此，代表性的体积元素（RVE）进行了分析，这是从三维重建的真实的微观结构。对于不同的微观结构的石墨（分布，大小，部分）屈服面进行了数值计算，并遵循其在循环载荷下的演变。此外，相应的流动方向进行了评估。微观结构的概率性质允许通过分析，除了RVE，许多较小的，不具有代表性的测试体积元素（TVE），在他们的集体统计代表性，并允许分散和上限和下限的屈服位点的分析。研究结果应用于制定一个材料模型的铸铁与层状石墨夹杂物。在未来，它应该有可能与此模型，考虑到当地的材料性能，在计算组件设计。

项目成果

Does the cyclic J-integral ΔJ describe the crack-tip opening displacement in the presence of crack closure?

• DOI: 10.1016/j.engfracmech.2014.07.017
• 发表时间: 2015
• 期刊: Engineering Fracture Mechanics
• 影响因子: 5.4
• 作者: M. Metzger;T. Seifert;C. Schweizer

Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron—Part III: A new yield function derived from microstructure-based models

片状灰铸铁的微观结构相关塑性的计算评估——第三部分：从基于微观结构的模型导出的新屈服函数

• DOI: 10.1016/j.ijsolstr.2016.02.027
• 发表时间: 2016
• 期刊: International Journal of Solids and Structures
• 影响因子: 3.6
• 作者: M. Metzger;T. Seifert
• 通讯作者: T. Seifert

Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron – Part II: initial yield surfaces and directions

片状灰铸铁微观结构相关塑性的计算评估第二部分：初始屈服面和方向

• DOI: 10.1016/j.ijsolstr.2015.04.014
• 发表时间: 2015
• 期刊: International Journal of Solids and Structures
• 影响因子: 3.6
• 作者: M. Metzger;T. Seifert
• 通讯作者: T. Seifert

Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron – Part I: Methods and microstructure-based models

片状灰铸铁微观结构相关塑性的计算评估第一部分：方法和基于微观结构的模型

• DOI: 10.1016/j.ijsolstr.2015.04.016
• 发表时间: 2015
• 期刊: International Journal of Solids and Structures
• 影响因子: 3.6
• 作者: M. Metzger;T. Seifert
• 通讯作者: T. Seifert

Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron – Part IV: Assessment of the yield surface after plastic loading

片状灰铸铁微观结构相关塑性的计算评估 â 第四部分：塑性加载后屈服面的评估

• DOI: 10.1016/j.ijsolstr.2018.02.020
• 发表时间: 2018
• 期刊: International Journal of Solids and Structures
• 影响因子: 3.6
• 作者: M. Metzger;T. Seifert
• 通讯作者: T. Seifert