新型Ti-Al金属间化合物多孔材料有效泊松比的理论表征

发布时间：2018-03-03 08:29

本文选题：Ti-Al金属间化合物　切入点：多孔材料　出处：《粉末冶金材料科学与工程》2017年03期 　论文类型：期刊论文

【摘要】：基于新型Ti-Al金属间化合物多孔材料真实孔隙的空间结构特征,采用三维八面体结构模型,首次通过能量法推导出表征多孔材料有效泊松比的理论公式,给出有效泊松比与其相对密度的显式表达式。并以圆形截面的孔棱为例,将本文有效泊松比与已有结果进行比较。结果表明:本文方法表征有效泊松比理论公式的推导过程更简单直接,所得结果更合理可靠。同时分析了孔棱横截面的几何形状和孔棱变形时剪力对有效泊松比的影响规律。分析表明,两者对有效泊松比的影响均随相对密度增大而增加,当相对密度较大时必须考虑剪力的影响。
[Abstract]:Based on the spatial structure characteristics of the real pores of new Ti-Al intermetallic compound porous materials, the theoretical formula of effective Poisson's ratio of porous materials is first derived by energy method using a three-dimensional octahedral structure model. An explicit expression of the effective Poisson's ratio and its relative density is given. The effective Poisson's ratio is compared with the existing results. The results show that the derivation process of the theoretical formula of effective Poisson's ratio is simpler and more direct. The results obtained are more reasonable and reliable. At the same time, the effects of the geometry of the cross section of the hole and the shear force on the effective Poisson's ratio during the deformation of the hole edges are analyzed. The results show that the influence of both of them on the effective Poisson's ratio increases with the increase of the relative density. The influence of shear force must be considered when the relative density is high.
【作者单位】：中南林业科技大学土木工程与力学学院;中南大学土木工程学院;中南大学粉末冶金研究院;
【基金】：国家自然青年科学基金项目(11502307) 湖南省自然青年科学基金项目(2016JJ3187) 湖南省教育厅一般项目(14C1189) 中南林业科技大学引进高层次人才科研启动基金
【分类号】：TB383.4;TG146.2

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