文献类型：期刊文献

中文题名：基于X射线计算机断层扫描技术的重组竹湿热耦合老化评估

英文题名：Hydrothermal aging evaluation method of recombinant bamboo based on X-ray computed tomography technology

作者：王卿平[1,2,3] 费本华[1] 蒋明亮[2] 刘杏娥[1] 杨淑敏[1]

第一作者：王卿平

通信作者：Yang, Shumin

机构：[1]国际竹藤中心竹藤科学与技术重点实验室,北京100102;[2]中国林业科学研究院木材工业研究所,北京100091;[3]北京林业大学材料科学与技术学院,北京100083

年份：2018

卷号：35

期号：4

起止页码：989-998

中文期刊名：复合材料学报

外文期刊名：Acta Materiae Compositae Sinica

收录：CSTPCD;;EI(收录号：20184105920730);Scopus(收录号：2-s2.0-85054361674);北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家重点研发计划(2016YFD0600904);林业公益性科研专项(201304513);国家自然科学基金(31670565)

语种：中文

中文关键词：X-CT技术;重组竹;湿热耦合老化;密度;内胶合强度

外文关键词：X-CT technology; recombinant bamboo; hydrothermal aging; density; internal bond strength

分类号：TB332;O434.19

摘要：为了预测重组竹制品在实际使用中的寿命,基于X射线计算机断层扫描技术(X-ray computed tomography technology,X-CT),采用标准BS EN 1087-1:1995作为重组竹湿热耦合老化条件,以其CT值和老化分析指标的数学模型评估重组竹湿热耦合老化后结构强度的损失。结果表明:重组竹老化后密度、内胶合强度和CT值均小于老化前,且老化前后差异显著。随老化时间增加,其密度、内胶合强度和CT值的损失均增加,且变化趋势基本一致,在1~2h阶段变化较大,在2.5~4.5h阶段变化较平缓,在老化4.5h时达到峰值;将CT值差值与密度差值拟合为线性模型,模型相关系数R^2=0.9270,验证模型R^2=0.9438。CT值差值与内胶合强度差值拟合为Allometric模型,模型相关系数R^2=0.9488,验证模型R^2=0.9439;竹材自身的植物学特征及重组竹压制工艺造成了试验数据离散及老化前后离散程度发生改变。可通过改善重组竹制备工艺提高其内部均匀性及降低老化前后离散程度变化,以提高模型预测精度。
To predict their lifespan of reconstituted bamboo products in practical use,X-ray computed tomography technology（X-CT） was employed and the standard of BS EN 1087-1：1995 was used as the hydrothermal aging condition of recombinant bamboo.The loss of structural strength was evaluated by the mathematical model of the CT value and the aging analysis indicators after hydrothermal aging of reconstituted bamboo.The results show that：the density,the internal bond strength and the CT value of recombinant bamboo are decreased after aging than before aging,and the differences are significant before and after aging.With the increasing of the aging time,the losses of the density,the internal bond strength and the CT value are increased and their changing trends are basically the same,which rapidly change in 1-2 hand gently change in 2.5-4.5 hand reach the peak at 4.5 h;the CT value difference and the density difference are fitted into linear model whose model correlation coefficient R^2 and validation model R^2 are 0.9270 and 0.9438,respectively,and the CT value difference and the internal bond strength difference are fitted into Allometric model whose model correlation coefficient R^2 and validation model R^2 are 0.9488 and 0.9439,respectively;the botanical characteristics of bamboo and the press technology of reconstituted bamboo cause the discretizing of the experimental data and the change of the discretizing before and after aging.The internal uniformity of reconstituted bamboo can be improved and the change of the discretizing before and after aging can be reduced by improving the press technology to enhance the prediction accuracy of the models.