冲击作用下混凝土裂纹扩展试验研究及数值模拟

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (17) : 107-112.

论文

张华1，郭继鑫1，傅玉珍1，高群2，王斌1

作者信息 +

Experimental study and simulation analysis of concrete crack propagation under impact load

ZHANG Hua1,GUO Jixin1,FU Yuzhen1,Gao Qun2

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摘要

采用改进的分离式霍普金森杆（SHPB）分别对混凝土无切槽平台巴西圆盘FBD (flattened Brazilian disc)、直切槽平台巴西圆盘CSTFBD (cracked straight-through flattened Brazilian disc)试件进行不同应变率的径向劈裂试验，得出无切槽平台巴西圆盘的劈裂拉伸应力-径向应变曲线，以及三种不同强度等级混凝土的动态弹性模量、峰值应力、峰值应变、拉伸敏感系数的应变率效应。此外，分析了不同角度预制裂纹对中心直裂纹巴西圆盘断裂韧性的影响以及复合裂纹的复合比与加载角度的关系。采用ABAQUS中的扩展有限元法对劈裂冲击试验中的直切槽平台巴西圆盘的破坏过程进行了模拟，并且对试件的裂纹扩展和破坏机理进行了分析，将数值模拟得到的结果与试验结果进行对比，得到主裂纹的扩展趋势是一致的。

Abstract

The radial spitting crack experiment were conducted by using improved Hopkinson pressure bar (SHPB) for flattened Brazilian disc (FBD) and cracked straight through flattened Brazilian disc (CSTFBD) under different stain rate, splitting tensile stress-radial strain curves of flattened Brazilian disc, dynamic elastic modulus, peak stress, peak strain and tensile strain rate sensitive coefficient effects of concrete with three different strength grades were obtained. In addition, the influence of pre-crack with different angle on fracture toughness of cracked straight through flattened Brazilian disc and the relationship between composite ratio of mixed mode cracks and loading angle. The crack propagation and failure mechanism were studied and the results of experiments and XFEM simulation were compared. The results show that the growth trends of cracks by test are consistent with those of numerical simulation.

关键词

裂纹扩展 / 应变率 / 平台巴西圆盘 / 断裂韧性 / Hopkinson杆

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张华1，郭继鑫1，傅玉珍1，高群2，王斌1. 冲击作用下混凝土裂纹扩展试验研究及数值模拟[J]. 振动与冲击, 2016, 35(17): 107-112

ZHANG Hua1,GUO Jixin1,FU Yuzhen1,Gao Qun2. Experimental study and simulation analysis of concrete crack propagation under impact load[J]. Journal of Vibration and Shock, 2016, 35(17): 107-112

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