刚玉空心球混凝土动态特性实验研究

陆松1,许金余1, 2,罗鑫1,董宗戈3,王宏伟4

振动与冲击 ›› 2016, Vol. 35 ›› Issue (12) : 110-116.

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (12) : 110-116.
论文

刚玉空心球混凝土动态特性实验研究

  • 陆松1,许金余1, 2,罗鑫1,董宗戈3,王宏伟4
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Dynamic Features Experiment of Hollow Corundum Ball Concrete

  • LU Song1,XU Jin-yu1,2,LUO Xin1,DONG Zongge3,WANG Hongwei4
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摘要

采用φ100mm分离式Hopkinson压杆试验装置研究了刚玉空心球混凝土(HCBC)和素混凝土(PC)在不同应变率下的冲击压缩性能,研究了动态抗压强度和临界应变与应变率之间的关系,以材料本构能的耗散定义损伤变量,分析了HCBC和PC的动态损伤演化规律。结果表明,应力-应变曲线表现出明显的三个阶段:弹性区,平台区和致密区,HCBC的三阶段效应比PC更加明显,表明HCBC脆性小,韧性大;这两种混凝土的动态抗压强度和临界应变与应变率成线性关系,并给出了经验公式,表明HCBC是一种率相关的增强增韧材料。HCBC和PC的损伤发展可以归纳为三个阶段:损伤未发展,损伤稳定发展和损伤不稳地发展;损伤应力槛值和损伤槛值与应变率变化关系不大,损伤应力最大阀值和损伤最大阀值随应变率增大而增大,而且HCBC的损伤应力槛值低于PC的,表明HCBC的韧性较好。这为HCBC作为军事防护工程分配层的填充材料提供了理论指导。

Abstract

The dynamic compressive experiments of Hollow Corundum Ball Concrete (HCBC) and Plain Concrete (PC), under different stain rate, are made by using a 100-mm-diameter split Hopkinson pressure bar apparatus. The relationship between dynamic compressive strength with strain rate is studied, so does the critical strain. The dynamic evolution rule of HCBC and PC is analyzed with the loss vector of dissipation of material constitutive energy. The results show that the stress versus strain curves exhibits apparently three stages: elastic; platform; density. This performance of HCBC is more obvious than that of PC. The brittleness of HCBC is small and the toughness is large. The dynamic compressive strength and critical stain increase with the increase of strain rate, and the experiment relation is given. The results demonstrate HCBC is reinforce and toughing material obvious correlation with strain rate. The evolution development of HCBC and PC can be divided into three stages: no damage development, stable damage development and unstable damage development. The threshold of damage-strain and damage has no relationship with change of strain rate, and the maximum threshold of damage-stress and damage increases with the increase of stain rate. The threshold of damage-stress of HCBC is lower than PC, which demonstrates the toughness is better than PC’s. The results can be theory guider for HCBC to be used for military defensive engineering’s distribution layer.

 

关键词

刚玉空心球混凝土 / SHPB / 动态抗压强度 / 临界应变 / 损伤发展

Key words

hollow corundum ball concrete / SHPB / dynamic compressive strength / critical strain / damage development

引用本文

导出引用
陆松1,许金余1, 2,罗鑫1,董宗戈3,王宏伟4. 刚玉空心球混凝土动态特性实验研究[J]. 振动与冲击, 2016, 35(12): 110-116
LU Song1,XU Jin-yu1,2,LUO Xin1,DONG Zongge3,WANG Hongwei4. Dynamic Features Experiment of Hollow Corundum Ball Concrete[J]. Journal of Vibration and Shock, 2016, 35(12): 110-116

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