森林工程2026，Vol.42Issue(1)：78-89,12.DOI:10.7525/j.issn.1006-8023.2026.01.008
基于声发射临界慢化特征的木材断裂前兆
Wood Fracture Precursors Based on Critical Slowing Down Characteristics of Acoustic Emission
摘要
Abstract
To predict the micro and macro failure behavior of wood under load,a prediction approach of wood damage precursors based on the b-value(describe the frequency distribution characteristics of acoustic emission signals)of the acoustic emission(AE)signal and the critical slowing down(CSD)characteristics was proposed.Firstly,to analyze the impact of load application rate on the wood failure process,two loading rates of 2 mm/min and 5 mm/min were employed in the wood three-point bending experiment,and AE signals released during the damage process of wood specimens were collected at a sampling rate of 500 kHz.Subsequently,an improved b-value calculation approach based on the classifica-tion of AE signal amplitude was proposed,and the AE signals generated during the experiment were divided into three levels,and the process of crack generation and development inside the wood specimen under load was described accord-ingly.Finally,in accordance with the principle of CSD,a prediction method of wood fracture precursors based on the length correlation coefficient and variance of AE signal was presented.The results demonstrated that the combination of different levels of b-values can reflect the fracture features and the generation of microcracks in the damage process of the specimen.CSD occurred when wood cracked at both the micro and macro levels,which was manifested in the increase of the correlation coefficient and variance of AE signal.At different loading rates,when the load reached approximately 80%of the ultimate yield strength,all the specimens displayed a significant CSD phenomenon.关键词
木材/声发射/b值/微观破坏/宏观破坏/临界慢化/前兆预测/屈服强度Key words
Wood/acoustic emission/b-value/microscopic destruction/macroscopic destruction/critical slowing down/precursor prediction/yield strength分类
农业科技引用本文复制引用
翟二壮,李明,方赛银,邓婷婷,陈楚敏,王景贵,杜坤..基于声发射临界慢化特征的木材断裂前兆[J].森林工程,2026,42(1):78-89,12.基金项目
国家自然科学基金(32160345) （32160345）
云南省农业基础联合专项项目(202501BD070001-030) （202501BD070001-030）
云南省基础研究专项(202201AU070068). （202201AU070068）
