[1]邓扬,丁幼亮,李爱群.基于声发射速率过程理论的钢绞线损伤演化试验研究[J].东南大学学报(自然科学版),2010,40(6):1238-1242.[doi:10.3969/j.issn.1001-0505.2010.06.021]
 Deng Yang,Ding Youliang,Li Aiqun.Experimental study on damage evolution of steel strands based on acoustic emission signals and rate process theory[J].Journal of Southeast University (Natural Science Edition),2010,40(6):1238-1242.[doi:10.3969/j.issn.1001-0505.2010.06.021]
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基于声发射速率过程理论的钢绞线损伤演化试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
40
期数:
2010年第6期
页码:
1238-1242
栏目:
土木工程
出版日期:
2010-11-20

文章信息/Info

Title:
Experimental study on damage evolution of steel strands based on acoustic emission signals and rate process theory
作者:
邓扬 丁幼亮 李爱群
东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 210096
Author(s):
Deng Yang Ding Youliang Li Aiqun
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 210096,China
关键词:
声发射 速率过程理论 钢绞线 概率密度 损伤演化
Keywords:
acoustic emission rate process theory steel strands probability density damage evolution
分类号:
TU997
DOI:
10.3969/j.issn.1001-0505.2010.06.021
摘要:
为了实现钢绞线损伤的实时量化评价,基于速率过程理论建立了钢绞线的损伤演化与声发射信号特征参数的相关方程.采用声发射技术对钢绞线的拉伸过程进行了动态监测,在此基础上采用多项式模型推导了钢绞线的声发射事件概率密度函数和损伤演化方程.试验结果表明:钢绞线弹性阶段的声发射信号主要来源于钢丝之间的摩擦,而塑性阶段的信号则来源于钢绞线材料的塑性变形,钢绞线声发射累积计数曲线与加载曲线具有同步变化关系,声发射累积计数曲线较好地描述了钢绞线材料内部损伤发生及发展变化的全过程.分析结果验证了采用速率过程理论建立的损伤演化方程对钢绞线损伤进行量化评价的有效性和准确性.
Abstract:
In order to realize the real time quantitative evaluation of the damage of steel strands, an equation relating the damage evolution of steel strands to characteristic parameters of acoustic emission(AE)signals was established by using the AE rate process theory. The AE technique was employed to dynamically monitor the tensile process of the steel strands. On this basis, the probability density function of AE events and the damage evolution equation were deduced by using the polynomial model. The results show that the AE signals stem from the friction among the wires during the elastic stage and the AE signals in the plastic stage derive from the plastic deformation of wires. Besides, the relationship between the AE cumulative counts curves and the loading curve was observed to change simultaneously, and the AE cumulative counts curves can well describe the process of damage occurrence and development in steel strands. The analysis results verify the effectiveness and accuracy of the damage evolution equation established using AE technique and rate process theory in the quantitative damage evaluation of steel strands.

参考文献/References:

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备注/Memo

备注/Memo:
作者简介: 邓扬(1984—),男,博士生; 李爱群(联系人),男,博士,教授,博士生导师,aiqunli@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(50808041,50978056)、教育部博士点基金(新教师基金)资助项目(200802861011)、江苏省自然科学基金资助项目(BK2008312)、东南大学优秀博士学位论文基金资助项目(YBJJ0923).
引文格式: 邓扬,丁幼亮,李爱群.基于声发射速率过程理论的钢绞线损伤演化试验研究[J].东南大学学报:自然科学版,2010,40(6):1238-1242. [doi:10.3969/j.issn.1001-0505.2010.06.021]
更新日期/Last Update: 2010-11-20