| 木材损伤断裂过程的声发射特性与Felicity效应 |
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| 引用本文： | 邵卓平,陈品,查朝生,季坤.木材损伤断裂过程的声发射特性与Felicity效应[J].林业科学,2009,45(2). |
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| 作者姓名： | 邵卓平 陈品 查朝生 季坤 |
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| 作者单位： | 1. 安徽农业大学林学与园林学院,合肥,230036
2. 合肥工业大学振动与燥声研究所,合肥,230009 |
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| 基金项目： | 国家自然科学基金，安徽农业大学创新团队资助项目 |
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| 摘 要： | 以2种针叶材、2种阔叶材为试材,研究无缺陷试件和含横纹裂纹试件在弯曲破坏过程中材料内部微结构演化的声发射特性,并利用声发射特征参数对几种损伤类型进行辨识.结果表明:1)无缺陷试件在加载初期声发射事件发展较为缓慢,且出现的主要是一些低振幅的AE信号,而大量高振幅AE信号出现在峰值载荷附近及韧性断裂阶段;2)利用声发射监测含裂纹试件在三点弯曲载荷下的损伤并断裂全过程,可以明显地识别裂纹尖端启裂和扩展的不同阶段;3)声发射信号的特征与损伤模式有关,胞壁断裂对应的AE特征为高幅值、高能量及长持续时间,而胞壁界面损伤与层裂损伤和细胞屈服与压溃损伤对应的AE特征为低幅度、低能量及短持续时间;4)木试件在低载荷水平下呈现Kaiser效应,而在高载荷水平下呈现Felicity效应,应用Felicity比能够较好地反映木结构的损伤程度.
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| 关 键 词： | 木材 损伤断裂 声发射特性 Felicity效应 |
Acoustic Emission Characteristics of Damage and Fracture Process of Wood and Felicity Effect |
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| Shao Zhuoping,Chen Pin,Zha Chaosheng,Ji Kun.Acoustic Emission Characteristics of Damage and Fracture Process of Wood and Felicity Effect[J].Scientia Silvae Sinicae,2009,45(2). |
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| Authors: | Shao Zhuoping Chen Pin Zha Chaosheng Ji Kun |
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| Institution: | 1.School of Forestry and Landscape Architecture;Anhui Agricultural University Hefei 230036;2.Institute of Sound and Vibration Research;Hefei University of Technology Hefei 230009 |
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| Abstract: | Take two softwoods and two hardwoods as test materials,studied on microstructure evolves of non-flaw and crosswise crack-contained specimens under bending break process by acoustic emission(AE) technology,and using the AE characteristic parameters to distinguish several damaged types.The results indicate:the ratio of AE hits occurred of non-flaw specimens were small during the initiation of loading,and mainly appears low amplitude and low energy AE signals.As the load reached the peak and during the fractur... |
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| Keywords: | wood damage and fracture acoustic emission characteristics felicity effect |
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