非充填およびガラス短繊維充填ポリエステル樹脂Xenoyの破壊じん性J_cおよび微視力学物性に対するウェザリングの効果

概要

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Influence of weathering on fracture toughness (J_c), microhardness (H_μ) and ultrasonic velocity (V_r) in unfilled and short-glass-fiber-filled polyester, Xenoy, has been investigated. The materials were weathered outdoors in Perth, West Australia. The specimens weathered for 6 months showed a slight increase in J_c as compared with unweathered specimens. Weathering for 11 months caused a large decrease in J_c and a slight increase in yield strength. Fracture surfaces of the specimens, however, exhibited little difference. 0n the other hand, H_μ measurements revealed a feature consistent with the trend of J_c. V_r decreased considerably in the surface layer weathered for 11 months. Weathering by artificial ultraviolet rays induced a strong increase in H_μ and a small decrease in V_r. Consequently, it was shown that the measurement of J_c in combination with H_μ and V_r is an effective way of studying weathering effects for thermoplastics.
一般社団法人日本機械学会の論文
1995-02-25