声发射传感器监测聚乙烯醇纤维混凝土的温度疲劳失效机制。

Monitoring of temperature fatigue failure mechanism for polyvinyl alcohol fiber concrete using acoustic emission sensors.

机构信息

School of Civil Engineering, Dalian University of Technology, Dalian 116024, China.

出版信息

Sensors (Basel). 2012;12(7):9502-13. doi: 10.3390/s120709502. Epub 2012 Jul 11.

DOI:10.3390/s120709502

PMID:23012555

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3444113/

Abstract

The applicability of acoustic emission (AE) techniques to monitor the mechanism of evolution of polyvinyl alcohol (PVA) fiber concrete damage under temperature fatigue loading is investigated. Using the temperature fatigue test, real-time AE monitoring data of PVA fiber concrete is achieved. Based on the AE signal characteristics of the whole test process and comparison of AE signals of PVA fiber concretes with different fiber contents, the damage evolution process of PVA fiber concrete is analyzed. Finally, a qualitative evaluation of the damage degree is obtained using the kurtosis index and b-value of AE characteristic parameters. The results obtained using both methods are discussed.

摘要

研究了声发射（AE）技术在监测聚乙烯醇（PVA）纤维混凝土在温度疲劳荷载下损伤演化机制中的适用性。通过温度疲劳试验，获得了 PVA 纤维混凝土的实时 AE 监测数据。基于整个试验过程的 AE 信号特征以及不同纤维含量的 PVA 纤维混凝土的 AE 信号比较，分析了 PVA 纤维混凝土的损伤演化过程。最后，利用 AE 特征参数的峭度指数和 b 值对损伤程度进行了定性评价。讨论了两种方法的结果。