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首页> 外文期刊>Journal of engineering materials and technology >Continuum Models for the Plastic Deformation of Octet-Truss Lattice Materials Under Multiaxial Loading
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Continuum Models for the Plastic Deformation of Octet-Truss Lattice Materials Under Multiaxial Loading

机译：多轴载荷下八角形桁架格形材料塑性变形的连续模型

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The continuum models that take plastic material behavior into consideration are derived to analyze periodic octet-truss lattice materials under multiaxial loading. The main focus of this study is to investigate the basic topology of unit cell structures having the cubic symmetry and to formulate the analytical models for predicting pressure load-dependent stress surfaces accurately. The discrete lattice materials are converted into equivalent model continua that are obtained by physically homogenizing the property of the unit cell structures. The effective continuum models contain information on the mechanical characteristics of internal truss members with respect to axial stiffness, internal stress variable, structural packing, and material density at the microscale level. With the hardening material model introduced in the homogenization process, the plastic flow acting on the microscopic truss members gives rise to extend the elastic domain of the analytical stress function derived from homogenize constitutive equations at the macroscale level. Analytical stress predictions show excellent agreements with the results obtained from finite element (FE) analyses.
机译：推导了考虑塑性材料行为的连续模型，以分析多轴载荷下的周期八角形桁架晶格材料。这项研究的主要重点是研究具有立方对称性的晶胞结构的基本拓扑，并建立用于精确预测与压力载荷有关的应力表面的分析模型。离散的晶格材料被转换为等效模型连续体，该等效模型连续体通过物理上均匀化晶胞结构的属性而获得。有效的连续模型包含有关内部桁架构件的机械特性的信息，这些信息涉及轴向刚度，内部应力变量，结构填充和微观级别的材料密度。通过在均质化过程中引入硬化材料模型，作用在微观桁架构件上的塑性流引起了在宏观水平上扩展了由均质化本构方程得出的解析应力函数的弹性域。分析应力预测显示与有限元（FE）分析获得的结果非常吻合。

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