基于位错密度的体心立方晶体塑性本构模型

发布时间：2019-04-17 19:10

【摘要】：晶体塑性理论是将晶体微观尺度的位错运动与宏观尺度的塑性形变相结合的重要理论,提供了在细观尺度内研究材料力学行为的有效方法。位错的密度变化对金属晶体的硬化行为有着重要的影响。该文在晶体塑性理论的基础上引入位错运动理论,建立基于位错密度的体心立方晶体(body center cubic,BCC)塑性本构模型,研究BCC的力学行为;并借助ABAQUS有限元软件,编写UMAT子程序,实现对BCC结构的铁单晶及多晶单轴拉伸试验的数值模拟。结果表明:该本构模型能有效地模拟铁单晶及多晶单轴拉伸的力学行为。
[Abstract]:The theory of crystal plasticity is an important theory which combines dislocation motion in micro-scale with plastic deformation in macro-scale. It provides an effective method to study the mechanical behavior of materials in micro-scale. The change of dislocation density has an important effect on the hardening behavior of metal crystals. In this paper, based on the theory of crystal plasticity, the dislocation motion theory is introduced, and the plastic constitutive model of bulk-centered cubic crystal (body center cubic,BCC) based on dislocation density is established to study the mechanical behavior of BCC. With the help of ABAQUS finite element software, the Umats subprogram is compiled to simulate the single crystal and polyaxial tensile test of BCC structure. The results show that the constitutive model can effectively simulate the mechanical behavior of single crystal iron and polycrystalline uniaxial tension.
【作者单位】：清华大学核能与新能源技术研究院;
【基金】：国家自然科学基金资助项目(11202114) 北京高等学校青年英才计划项目(YETP0156)
【分类号】：O772

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