Open AccessAn Approach for Analyzing the Dynamic Strength Increment of Concrete Material
Author(s) -
Peibao Xu,
Dali Ge,
Jianheng Zhao,
Yong Yu,
Kai Li
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/371/4/042037
Subject(s) - split hopkinson pressure bar , strain rate , calibration , inertial frame of reference , dynamic testing , structural engineering , experimental data , properties of concrete , materials science , fictitious force , compressive strength , computer science , mechanics , composite material , mathematics , statistics , engineering , physics , classical mechanics
The Split Hopkinson Pressure Bar (SHPB) is usually used to get the dynamic compressive strength of concrete materials at strain-rate between 10 1 and 10 3 s −1 . It is widely accepted that the main influencing factors of dynamic strength include strain-rate effect and inertial effect in SHPB tests, which result in obvious scattered phenomenon existing in the test data. However, many empirical formulae of dynamic increase factor were directly obtained from the scattered test data to describe the material properties, which has been overestimated strain-rate effect for design analysis. In present paper, numerical simulations with a rate-independent material model are used to study this pseudo-strain-rate sensitive phenomenon because it is very difficult to quantify these influences by conducting laboratory tests. Then a unified approach for processing the scattered test data of normal concrete is available especially for mid-high strain rate. Moreover, the quantitative relations among the strain-rate effect, inertial effect and calibration test data have been obtained with the help of the corresponding numerical simulations, and semi-empirical formulae are also proposed to describe the inertial effect and strain-rate effect.