橡胶自密实混凝土疲劳断裂全过程声发射特征辨识参量试验研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (15) : 129-136.

论文

陈徐东，王佳佳，田华轩

作者信息 +

Tests for acoustic emission characteristic recognition parameters of rubber self-compacting concrete in fatigue fracture process

CHEN Xudong, WANG Jiajia, TIAN Huaxuan

Author information +

文章历史 +

摘要

废旧轮胎日益增多带来严重的环境问题，将废旧轮胎橡胶颗粒作为混凝土骨料能够减少污染和减少天然骨料的使用。采用液压闭环伺服材料试验机MTS322试验装置(material testing system,MTS)对橡胶自密实混凝土梁进行了静态弯拉试验和不同加载工况下的疲劳弯拉试验。对橡胶自密实混凝土梁在三点弯作用下的断裂性能进行了系统地研究，并考虑了橡胶自密实混凝土梁在不同加载应力水平和应力比下的疲劳破坏规律。讨论了应力场强度因子与断裂韧度的比值与疲劳次数的对数之间的数学关系，建立了橡胶自密实混凝土的疲劳损伤预测模型。试验过程中还采用声发射技术实时测量了循环荷载作用下橡胶自密实混凝土梁内部的声发射信号，对比了不同加载应力水平和应力比下橡胶自密实混凝土梁内部裂缝发展的特征，发现了橡胶自密实混凝土梁内部裂缝的生长分为三个阶段，应力水平越低的情况下，橡胶自密实混凝土梁内部疲劳损伤程度越严重。

Abstract

More and more waste tires bring serious environmental problems. Taking waste tire rubber particles as concrete aggregate can reduce pollution and the use of natural aggregate. Here, static bending-tensile tests and fatigue bending-tensile tests under different loadings were conducted for rubber self-compacting concrete beams using the hydraulic closed loop servo material testing machine MTS322. The fracture behavior of rubber self-compacting concrete beams under 3-point bending was studied systematically, and their fatigue failure laws under different loading stress levels and stress ratios were discussed to obtain the mathematical relationship between the ratio of stress field strength factor to fracture toughness and the logarithm of fatigue times. The fatigue damage prediction model of rubber self-compacting concrete was established. In test process, the acoustic emission (AE) technique was used to measure AE signals inside rubber self-compacting concrete beam under cyclic load in real time. The characteristics of crack development in rubber self-compacting concrete beam under different loading stress levels and stress ratios were compared. It was shown that the growth of inner cracks of rubber self-compacting concrete beam is divided into three stages; the lower the loading stress level, the more serious the fatigue damage degree inside rubber self-compacting concrete beam.

导出引用

陈徐东，王佳佳，田华轩. 橡胶自密实混凝土疲劳断裂全过程声发射特征辨识参量试验研究[J]. 振动与冲击, 2021, 40(15): 129-136

CHEN Xudong, WANG Jiajia, TIAN Huaxuan. Tests for acoustic emission characteristic recognition parameters of rubber self-compacting concrete in fatigue fracture process[J]. Journal of Vibration and Shock, 2021, 40(15): 129-136

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