材料科学
复合材料
多孔性
无定形固体
多孔玻璃
相(物质)
变形(气象学)
幂律
抗压强度
玻璃化转变
压缩(物理)
弹性模量
模数
结晶学
聚合物
化学
统计
数学
有机化学
作者
Nikolai V. Priezjev,Maxim A. Makeev
标识
DOI:10.1016/j.jnoncrysol.2018.04.008
摘要
The role of porous structure and glass density in the response behavior to compressive deformation of amorphous materials is investigated via molecular dynamics simulations. The disordered, porous structures were prepared by quenching a high-temperature binary mixture below the glass transition point into the phase coexistence region. With decreasing average glass density, the pore morphology in quiescent samples varies from a random distribution of compact voids to complex pore networks embedded in a continuous glass phase. We find that during compressive loading at constant volume, the porous structure is linearly transformed in the elastic regime and the elastic modulus follows a power-law increase as a function of the average glass density. Upon further compression, pores deform significantly and coalesce into large voids leading to formation of domains with nearly homogeneous glass phase, which provides an enhanced resistance to deformation at high strain.
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