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材料三维微结构表征及其晶体塑性有限元模拟
3D modeling microstructure and crystal plasticity finite element simulation
投稿时间:2017-11-27  修订日期:2017-12-28
DOI:
中文关键词:  Voronoi  多晶集合体;晶体塑性有限元;晶体取向;各向异性
英文关键词:Voronoi diagram  Polycrystal  CPFEM  Crystal orientation  Anisotropic
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目),山西省自然科学青年基金
作者单位E-mail
辛存 太原理工大学 1277686203@qq.com 
赵聃 太原理工大学  
闫晓鹏 太原理工大学 zhaodantyut@163.com 
王志华 太原理工大学  
摘要点击次数: 26
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中文摘要:
      摘 要:铝合金具有轻质、高强等特性,已较为广泛地应用于航空、航天等运载工程领域。材料的力学性能,尤其是在有限变形下所呈现出的宏观各向异性,是航天器设计和服役寿命要考虑的关键因素。由于宏观模型不能较好地反映材料微观结构(晶粒的形貌,取向等)对宏观塑性各向异性的影响,因此,本文建立了能实际反映晶粒形貌的三维Voronoi模型,并基于晶体塑性理论对铝合金在有限变形下的响应进行计算。首先,建立反映材料微结构的代表性体积单元(RVE)模型进行计算,并与实验结果进行对比验证。其次,以单向拉伸为例,分析了有限变形过程中构成试件的晶粒形貌,取向分布等微观因素对宏观各向异性演化的影响,并从材料和结构两个层面讨论了微观结构对宏观力学性能的影响。结果表明,本文所建立的模型能够反映微观结构对宏观力学性能的影响,为航空航天领域、生产制造领域实际结构件的力学性能提供可靠的预测。
英文摘要:
      Abstract: Aluminum alloy has the characteristics of light quality and high strength. It has been widely used in aviation, aerospace and other transportation engineering fields. The anisotropy mechanical performance especially under finite deformation are the key factors in spacecraft design and service life. The phenomenal model can't reflect material microstructures (grain shape, orientation, etc.) which mainly influence the macroscopic plastic anisotropy. In this paper, the three-dimensional Voronoi model that can reflect actual structure of crystal has been established. Finite deformation response of aluminum alloy based on the crystal plasticity theory has been calculated. First, the material microstructure of representative volume unit (RVE) is established and calculated, verifying the accuracy of crystal plastic finite element method (CPFEM) through compared the result with experiment. Second, the process of grain morphology and macroscopic anisotropic influenced by orientation distribution in simple tension is analyzed. The mechanical properties from structure and material microstructure on the macroscopic are discussed. Finally, results show that the model established can reflect the mechanical properties, providing reliable mechanical properties predictions of the actual structures in aerospace field and manufactures.
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