ポリスチレン粉体圧縮成形体の動的特性(<小特集>粉体小特集)

概要

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Powdered polystyrene was compacted into specimens having various void fractions. The dynamic mechanical properties of these specimens were measured by the vibratory test method. The mechanical loss factor Q^<-1> of the compaction-molded specimen was found to increase with increasing void fraction and with increasing strain amplitude of vibration at various temperatures below the glass transition temperature of polystyrene. The dynamic modulus σ_0/ε_0, which was defined as a ratio of a stress amplitudeσ_0 to a strain amplitudeε_0, varied quite little with increasing strain amplitude and decreased with increasing void fraction. The Q^<-1> value decreased by sintering of interparticle contact points. Therefore, it was considered that the energy dissipation mechanism was attributed to the friction at a part having weak cohesive force in contact surfaces between adjacent particles. This was also supported by the fact that the Q^<-1>, value increased with decreasing tensile strength which implied decreasing interparticle cohesive force.
社団法人日本材料学会の論文
1980-09-15