湿热老化对树脂增强生物板蠕变性能影响及其时间-应力等效性研究  

Effect of hydrothermal aging on creep properties of resin reinforced bioboard and its time-stress equivalence

作　　者：李玉果 罗迎社[1,2] 彭万喜[3] LI Yuguoa;b;LUO Yingshea(a.Hunan Province Key Laboratory of Engineering Rheolog;b.College of Civil Engineerin;c.College of Material and Science Central South University of Forestry and Technology,Changsha 410004,Hunan,Chin)

机构地区：[1]中南林业科技大学工程流变学湖南省重点实验室,湖南长沙410004 [2]中南林业科技大学土木工程学院,湖南长沙410004 [3]中南林业科技大学材料科学与工程学院,湖南长沙410004

出　　处：《中南林业科技大学学报》2018年第8期122-128,共7页Journal of Central South University of Forestry & Technology

基　　金：湖南省战略性新兴产业重大科技成果转化类项目(2016GK4045)

摘　　要：在不同应力水平下,对经历不同湿热老化时间的树脂增强生物进行三点弯曲蠕变实验,研究了湿热老化对树脂增强生物板蠕变性能的影响。利用时间-应力等效原理,选取本试验所考虑的应力水平范围内的最低应力水平为参考应力(σ=69.2 MPa),将其他应力水平下的蠕变柔量曲线向参考曲线进行水平移位,构建了经历不同湿热老化时间的树脂增强生物板在参考应力水平下的蠕变柔量主曲线,从而可以通过较高应力水平下的短期蠕变行为来预测材料在较低应力水平下的较长期的蠕变行为。The effects of hydrothermal aging on creep properties of resin reinforced bioboard were studied by means of the three-point bending creep test under different hydrothermal aging time and stress levels. According to the time-stress equivalent principle, the main creep curves of resin reinforced bioboard under different aged times were constructed by shifting the creep curves under different stress levels into a master curve at reference stress levels which it was chosen at the minimum stress level in the range of stress levels considered in this study. Therefore, the long-term creep behavior of materials under lower stress level can be predicted by short-term creep behavior under higher stress levels.

关 键 词：树脂增强生物板 湿热老化 时间-应力等效原理 蠕变性能 

分 类 号：S781.42[农业科学—木材科学与技术]