摘要
木材声发射信号与其内外部损伤情况存在一定的定量关系.依据损伤理论和含有裂纹以及缺陷的木材不同阶段的声发射特征,分别探讨并建立了受交变载荷和单向静载荷情况下以声发射特征参数表示的木材损伤演变模型.分析结果与木材的实际情况相一致,表明以声发射特征参量建立的木材损伤演变模型对木材的损伤预测具有提前性与敏感性,而且木材的不均匀性是其提前破坏的主要原因之一.
There is a quantitative relationship between damage and acoustic emission in wood. Based on damage theory and the acoustic emission signal in wood with defects and cracks in different damage phases, this paper establishes wood mechanics models of damage evolution under alternating load and static load, as two kinds of common situations. Analytical results agree with lumber＇s actual situation. With special characteristics of the acoustic emission, wood mechanics model of damage evolution with is established, which can be used to forecast the damage in advance, and it is shown that inhomogeneity is one of the main causes of damage.
出处
《力学与实践》
CSCD
北大核心
2009年第2期74-77,共4页
Mechanics in Engineering
基金
北京市自然科学基金资助(2072013).
关键词
木材
微裂纹
声发射
损伤模型
wood, micro-crack, acoustic emission, model of damage
作者简介
张志研，硕士研究生，主要研究方向为木材无损检测．E-mail：zhiyan1011@163．com
赵东，教授，博士生导师，主要研究方向为木材力学．E-mail：zhaodong68@bjfu．edu．cn
