文献类型：期刊文献

英文题名：Rolling shear failure damage evolution process of CLT based on AE technology and DIC method

作者：Wang, Ting[1] Yang, Yin[1] Li, Yue[1] Wang, Zhiqiang[1] Gong, Yingchun[2] Zhou, Jianhui[3] Gong, Meng[4]

第一作者：Wang, Ting

通信作者：Wang, ZQ[1];Gong, YC[2]

机构：[1]Nanjing Forestry Univ, Coll Mat Sci & Engn, 159 Longpan Rd, Nanjing 210037, Jiangsu, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, 1 Dong Xiao Fu,Xiangshan Rd, Beijing 100091, Peoples R China;[3]Univ Northern British Columbia, Sch Engn, 499 George St, Prince George, BC V2L 1R7, Canada;[4]Univ New Brunswick, Wood Sci & Technol Ctr, 1350 Regent St, Fredericton, NB E3C 2G6, Canada

年份：2022

卷号：80

期号：3

起止页码：719-730

外文期刊名：EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS

收录：;EI(收录号：20220811685907);Scopus(收录号：2-s2.0-85124830052);WOS:【SCI-EXPANDED(收录号:WOS:000758298900002)】；

基金：This article was funded by the National Natural Science Foundation of China (Grant nos. 32071700, 31570559).

语种：英文

外文关键词：Acoustic emission testing - Cracks - Lumber - Shear strain

摘要：This paper proposed a methodology for monitoring the rolling shear (RS) failure of cross-laminated timber (CLT) via acoustic emission (AE) technique combined with digital image correlation (DIC) method. The RS strength of 3-layer CLT with different transverse layers (SPF dimension lumber, Douglas fir and Scots pine lumber) were measured using a modified approach. AE parameter analysis and cluster analysis were mainly focused on qualitative research on the relationship between wood RS failure evolution and AE events, while DIC method was used to characterize the shear strain distribution and development of specimens. Results showed that the tested group with Douglas fir lumber as transverse layer had the most AE events. The cumulative energy curve and cumulative counts curve of all tested groups had the same trend over time. The cluster analysis of AE signs indicated there were two kinds of AE events in CLT specimens during RS failure process, (a) the main AE events with low amplitude, originated from the initiation of micro-cracks in the transverse layer, and (b) the secondary AE events with all high-amplitude, attributed to the extension of cracks. A correlation between AE signal features and internal damage evolution of RS failure in the transverse layer was found in the experiments. DIC method could effectively and intuitively measure the surface shear strain of CLT, and predict the location of crack initiation in advance according to the evolution of the strain concentration area. The combination of AE technique and DIC method could correlate the RS damage modes with AE characteristics.