摘要
对塑木地板进行弯曲性能测试,选取25%、50%和75%3种应力水平进行疲劳/蠕变试验。结果表明:从断面结构来看,空心型塑木地板的疲劳/蠕变性能最好,实心型次之,开口型最差;在交变载荷最大值为塑木复合材料破坏载荷的50%、75%时,其疲劳/蠕变断裂曲线为三段式曲线,随着最大载荷保持时间的增加,蠕变加剧材料塑性变形,导致材料应变增大、迅速断裂;在25%和50%应力水平作用后,材料的剩余弯曲强度为原来的96%～98%。
The bending properties of three special-shaped wood-plastic composite decking board were tested. The creeps at 25 % ,50 % and 75 % of three stress levels were tested. The results showed that among three special-shaped cross-section structures, the fatigue creep behavior of the hollow profile was best, solid profile was the second, opening profile was the worst. When the alternating loads were 50 % and 75 % of the damaging loads, the fracture curves of fatigue/creep had three stages, namely, transient elastic deformation stage, delayed elastic deformation stage and accelerated fracture stage. After the action of fatigue and creep,the remained modulus of rupture was 96 % - 98 % of primary at 25 % and 50 % stress lever.
出处
《塑料》
CAS
CSCD
北大核心
2009年第2期85-87,共3页
Plastics
基金
国家自然科学基金(930871968
30771683)
关键词
塑木地板
弯曲强度
弹性模量
蠕变
疲劳
wood-plastic composite decking board
modulus of rupture
modulus of elasticity
creep
fatigue
