首页 | 本学科首页   官方微博 | 高级检索  
     

多孔材料代表单元的性质
引用本文:张俊彦,张平,甘秋兰,肖映雄.多孔材料代表单元的性质[J].工程力学,2004,21(2):124-128,100.
作者姓名:张俊彦  张平  甘秋兰  肖映雄
作者单位:湘潭大学基础力学与材料工程研究所,湘潭,411105
基金项目:高等学校骨干教师资助计划(gg-130-10530-1021),湖南省自科基金(01JJY2001)资助
摘    要:为了弄清多孔材料代表单元的基本性质,对泡沫镍的力学性能进行了实验研究和计算机模拟,两者结果的变化趋势吻合较好。在此基础上,用离散的弹性梁构成代表单元,结合连续介质力学的方法,建立了多孔材料的理想力学模型,导出了其宏观本构关系,讨论了其代表单元各向异性性质和材料常数之间的关系。结果表明由代表单元周期性排列构成的多孔材料,在宏观上呈各向异性,只有当代表单元无序地随机排列时,多孔材料才在宏观上出现统计各向同性。同时指出了一些文献中存在的错误。

关 键 词:多孔材料  代表单元  本构关系  计算机模拟  各向异性  体积模量
文章编号:1000-4750(2004)02-0124-06

THE PROPERTIES OF REPRESENTATIVE UNITS OF POROUS MATERIALS
ZHANG Jun-yan,ZHANG Ping,GAN Qiu-lan,XIAO Ying-xiong.THE PROPERTIES OF REPRESENTATIVE UNITS OF POROUS MATERIALS[J].Engineering Mechanics,2004,21(2):124-128,100.
Authors:ZHANG Jun-yan  ZHANG Ping  GAN Qiu-lan  XIAO Ying-xiong
Abstract:To clarify the essential properties of a representative unit of cellular materials, an experimental study and computer simulations on the mechanical properties of nickel foam were performed, and the results agreed well. Considering a discrete elastic beam as representative unit and combining continuous medium mechanics theory an ideal mechanical model for porous materials was established and its macroscopic constitutive relation was given. The relation between the anisotropy nature of representative unit and material constants was discussed. The results showed that the porous material consisting of periodically arrayed units exhibited macroscopic anisotropy. Only when the units were arrayed randomly without order, the porous material exhibited statistical macroscopic isotropy. At the same time, errors in the literature were pointed out.
Keywords:porous material  representative unit  constitutive equation  computer simulation  anisotropy  bulk modulus  
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号