基于SHPB技术的混凝土冲击弯拉惯性效应研究

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摘要混凝土材料的SHPB动态弯拉试验在试验技术方面还存在一定问题。按照应力平衡的假设，必须要知道三种应力波的具体值才能计算出应力和应变率。然而应力波沿试件纵向传播所需的时间比沿横向传播所需的时间短，当试件断裂时，透射杆上并不能测得应力波。根据Delvare等人的研究，可采用无限长梁模型，得到弯矩的计算公式，从而计算出试件的强度和应变率。此外，在冲击弯拉试验中，试件受到惯性力的作用会对试验精度产生一定影响，因此有必要对试件所受惯性力进行讨论。本试验中，试件在受到冲击的过程中只在部分长度内发生变形，定义该部分长度为有效长度，通过无限长梁模型的关系式推导得到有效长度的计算公式，并根据相关原理计算出试件受到的惯性力，计算出其真实强度。

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	陈徐东
	刘志恒
	陈晨

关键词 ：混凝土, 冲击, 惯性效应, 动态提高因子

Abstract：

There are still some problems in test technique of concrete material’s SHPB dynamic flexural and tensile tests. According to the assumption of stress equilibrium,it is necessary to know specific values of three kinds of stress waves to calculate stress and strain rate. However,the time required for longitudinal propagation of stress wave along a specimen is shorter than that for lateral propagation. Thus,stress wave can’t be measured on a transmission rod when the specimen is broken. According to the results obtained by Delvare et al,the calculation formula for bending moment can be derived using an infinite long beam model to further calculate the specimen’s strength and strain rate. In addition,in impact,bending and tensile tests,inertial forces exerted on the specimen affect the test accuracy. So,it is necessary to discuss inertial forces exerted on the specimen. Here,in impact tests,only part length of the specimen produced deformation. This part length was defined as the valid length. The relation formulas of the infinite long beam model were used to derive the calculation formula of the valid length. According to the correlation principle,inertia forces exerted on the specimen were calculated,and then the specimen’s actual strength was calculated.

Key words： concrete impact inertial effect dynamic increase factor

收稿日期: 2017-04-01 出版日期: 2017-04-28

引用本文:

陈徐东，刘志恒，陈晨. 基于SHPB技术的混凝土冲击弯拉惯性效应研究[J]. 振动与冲击, 2018, 37(17): 128-134.
CHEN Xudong, LIU Zhiheng, CHEN Chen. Impact,flexural and tensile inertial Effects of concrete based on SHPB technique. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(17): 128-134.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I17/128

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