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采用长为850~2 000μm的杨木纤维(PWF)增强高密度聚乙烯(HDPE),利用模压成型法制备了PWF/HDPE复合材料,对其进行了弯曲力学性能测试、无缺口简支梁冲击强度测试、24h弯曲蠕变-24h回复性能测试、1 000h蠕变性能测试及蠕变后残余弯曲力学性能测试,并利用两参数指数模型、Findley指数模型及四元件Burgers模型拟合蠕变曲线。结果表明:PWF/HDPE复合材料的弯曲强度为21.14 MPa,弹性模量为2.31GPa,无缺口冲击强度为6.77kJ/m~2;24h形变为0.803mm,24h回复率为78.46%,蠕变后弯曲强度下降了6.45%,而弹性模量增加了8.95%;1 000h形变为0.809mm,蠕变后弯曲强度保留了72.35%,弹性模量增加了10.67%;3种模型中,四元件Burgers模型拟合PWF/HDPE复合材料蠕变性能的效果较好。
The high density polyethylene (HDPE) was reinforced with poplar fiber (PWF) of 850 ~ 2 000 μm. The PWF / HDPE composites were prepared by compression molding. The flexural properties of the composites were tested. Strength test, 24 h creep creep -24 h reheat test, 1000 h creep test and creep residual flexural test. The creep curves were fitted by two-parameter exponential model, Findley exponential model and four-element Burgers model. The results show that the flexural strength of PWF / HDPE composites is 21.14 MPa, the elastic modulus is 2.31 GPa, the unnotched impact strength is 6.77 kJ / m ~ 2, the deformation of PWF / HDPE composites is 0.803 mm, the recovery rate of 24h is 78.46% The flexural strength decreased by 6.45%, the elastic modulus increased by 8.95%, the deformation at 1000h was 0.809mm, the flexural strength retained by 72.35% after creep, and the elastic modulus increased by 10.67%. Among the three models, the four element Burgers model Fitting PWF / HDPE composite creep better.