ポリスチレン粉体圧縮成形体の動的特性に及ぼす粒子表面処理の影響(<小特集>粉体小特集)

概要

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Powdered polystyrene was treated with concentrated sulfuric acid at various temperatures and then compacted into specimens having various void fractions. The dynamic mechanical properties of the compacts were measured by the vibratory method in the same manner as shown in our previous papers. The mechanical loss factor Q^<-1> of the compacts increased with increases in treating temperature. void fraction and strain amplitude of vibration. The dynamic modulus σ_0/ε_0 which was defined as the ratio of a stress amplitude σ_0 to a strain amplitude ε_0 decreased with increases in treating temperature and void fraction, but varied quite little with increasing strain amplitude. The relation between the mechanical loss factor and the value, which was defined by the cohesive force between particles, the static compressive force superimposed on vibration force and the frictional coefficient between polystyrene itself, was united into a function independent of the treating temperature and the void fraction. This fact can be interpreted by Mindlin's model with respect to the inelastic behavior of a pair of particles in contact subjected to a cyclic force : The increase in the mechanical loss factor of powder compacts is attributed to the friction at weak junctions between particles.
社団法人日本材料学会の論文
1981-09-15