水浸漬後のジュート繊維/PLA複合材料の引張クリープ寿命

抄録

In this study, tensile creep rupture life of plain woven jute fiber/PolyLactic Acid (PLA) composite after water immersion was investigated. The water absorption test of the composite was conducted in distilled water by 24 hours. The water temperature was room temperature. Water absorption rates of composites at 4 hours and 24 hours were 4 % and 8 %, respectively. Tensile creep tests of non and water absorbed composites were conducted based on Japanese Industrial standard K 7115. The environmental (ambient) temperature was room temperature. The maximum test time was 100 hours. As a result, the following conclusion was obtained. Creep rupture strengths of non, 4 % and 8 % water absorbed composite decreased with an increase of loading time. Creep rupture strengths at 100 hours of 4 % and 8 % water absorbed composite decreased 15 % and 30 %, respectively, compared with that of non water absorbed composite. When maximum stress was 33 MPa, the creep rupture life of composite decreased with an increase of water absorption rate. Generally, viscoelasticity of PLA resin as matrix was decreased by water absorption. Therefore, creep rupture strength and life of the composite were affected by decrease of viscoelasticity of PLA resin under water immersion.