| 声发射特性与材料断裂韧性相关性研究 |
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| 引用本文： | 朱波,蔡珣,王成国,蔡华甦.声发射特性与材料断裂韧性相关性研究[J].物理学报,2003,52(8):1960-1964. |
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| 作者姓名： | 朱波 蔡珣 王成国 蔡华甦 |
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| 作者单位： | (1)山东大学材料科学与工程学院，济南 250061; (2)山东大学计算机科学与技术学院，济南 250014 |
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| 基金项目： | 国家高技术研究发展计划(批准号：2002AA304090)资助的课题. |
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| 摘 要： | 以高强度铝合金的断裂过程为研究对象，利用先进的声发射试验系统，考察了拉伸试样和带有预制疲劳裂纹的DCB试样在断裂时的声发射事件特性，揭示了材料断裂韧性和声发射特性 间的关系.试验结果表明，材料稳态裂纹扩展起始于K1C并发射出许多幅值超过 阈值35 dB的信号，材料裂纹失稳扩展时爆发出强烈的声发射信号，材料断裂的累积声发射能与宏 观断裂能呈线性关系.
关键词：
声发射
断裂韧性
铝合金
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| 关 键 词： | 声发射 断裂韧性 铝合金 |
| 文章编号： | 1000-3290/2003/52(08)1960-05 |
| 收稿时间： | 2002-12-26 |
| 修稿时间： | 2002年12月26 |
Studies on the relationship between acoustic emission characteristics and fractu re toughness of materials |
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| Zhu Bo,Cai Xun,Wang Cheng-Guo and Cai Hua-Su.Studies on the relationship between acoustic emission characteristics and fractu re toughness of materials[J].Acta Physica Sinica,2003,52(8):1960-1964. |
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| Authors: | Zhu Bo Cai Xun Wang Cheng-Guo and Cai Hua-Su |
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| Abstract: | The corelation between acoustic emission characteristics and their fracture toughness has been investigated in this paper based on the study of high-strength al uminum alloy cracking process by using advanced acoustic emission experiment sys tem and smooth tensile specimens as well as DCB specimens with premade cracks. E xperimental results showed that the specimens emitted strong signals with an amp litude above 35 dB when a stable crack extension started at K1C. Stro nger and more complicated acoustic emission signals were found during unstable crack extension, and the cumulative energy of acoustic emission events were found to b e linearly related with the macroscopic fracture energy. |
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| Keywords: | acoustic emission fracture toughness aluminum alloy |
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