缺陷对多胞固体力学性能的影响

Effect of defects on mechanical properties of cellular solids

研究缺陷对多胞固体材料力学性能的影响,为此类材料的设计、制备工艺提供一定的理论指导.将胞壁抽象成理想弹性波纹梁,利用连续介质力学方法,建立了同时包含胞壁弯曲和胞壁缺省缺陷的多胞材料的力学模型,导出了多胞固体体积模量、剪切模量和弹性模量随缺陷、相对密度变化的表达式.胞壁弯曲和胞壁缺省对多胞固体产生极大影响,多胞材料的体积模量、剪切模量和弹性模量随胞壁弯曲程度、胞壁缺省的增加显著下降.

The influence of defects on mechanical properties of cellular solids is studied in order to offering guidance for the design and manufacture techniques of this kind of material in some degree. The cell walls of cellular solids are considered in the abstract as elastic corrugated beams using continuum mechanics. The mechanical model containing both wavy cell wall and missing cell wall is established, and expressions of bulk modulus, shear modulus and elastic modulus varying with imperfections and relative density are derived. The results show that the bulk modulus, shear modulus and elastic modulus decrease remarkably with the increasing degree of wavy and the missing of cell wall.