中文摘要：

研究了户外自然气候条件对木塑复合材料抗弯性能和弯曲蠕变性能的影响，并采用力学模型拟合其弯曲蠕变性能．结果表明：放置屋顶阳台上曝晒2—6个月后，材料的抗弯性能和抗蠕变能力下降，抗弯强度下降10．09％-20．27％；2个月后，材料产生的应变为室温时的1．4～1．9倍；4个月后，材料产生的应变开始减小，但仍为室温时的1．1—1．2倍；6个月后，由于温湿度和紫外强度的下降，材料产生的应变反而比室温时小．六元件模型能很好地模拟木塑复合材料的蠕变特性，且其具有简单热流变材料的特点，遵从时间-温度-应力等效原理．

英文摘要：

The effects of natural weathering on the bending properties and flexural creep behavior of wood -plastic composite （WPC） were studied and the creep behavior was simulated by mechanical model. The results showed that the bending properties and creep behavior reduced and modulus of rupture （MOR） reduced by 10.09% -20.27% for 2 -6 months under the natural environment （balcony in the roof）. And the creep strain under the natural environment for 2 months was 1.4 - 1.9 times bigger than the WPC at room temperature; it began to decrease for 4 months; but it was still 1.1 - 1.2 times bigger than what was at room temperature. And it was even smaller than what was at the room temperature for 6 months as the temperature and humidity and ultraviolet intensity decreased. The creep behavior of WPC could be well simulated by six - component model. WPC had simple thermal rheological property and met the time -temperature -stress correspondence principle.