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力学与实践 ›› 2009, Vol. 31 ›› Issue (2): 74-77.doi: 10.6052/1000-0879-2008-187

• 应用研究 • 上一篇    下一篇

木材损伤的声发射模式研究

张志研 赵东   

  1. 北京林业大学工学院,北京 100083
  • 收稿日期:2008-04-03 修回日期:2008-07-20 出版日期:2009-04-08 发布日期:2009-04-08

STUDY ON THE ACOUSTIC EMISSION MODEL OF WOOD DAMAGE

  • Received:2008-04-03 Revised:2008-07-20 Online:2009-04-08 Published:2009-04-08

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.

关键词: 木材,微裂纹,声发射,损伤模型

Abstract: 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.

Key words: wood, micro-crack, acoustic emission, model of damage