EXPERIMENTAL STUDY ON PULSE SHAPING TECHNIQUES OF LARGE DIAMETER SHPB APPARATUS FOR CONCRETE

JIANGBO WANG; WENFENG LI; LIZHI XU; ZHONGHUA DU; GUANGFA GAO

doi:10.1590/1679-78256268

EXPERIMENTAL STUDY ON PULSE SHAPING TECHNIQUES OF LARGE DIAMETER SHPB APPARATUS FOR CONCRETE

Authors

JIANGBO WANG SCHOOL OF MECHANICAL ENGINEERING, NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY, NANJING, JIANGSU 210094, P.R. CHINA HTTPS://ORCID.ORG/0000-0002-3338-1191
WENFENG LI SCHOOL OF MECHANICAL ENGINEERING, NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY, NANJING, JIANGSU 210094, P.R. CHINA HTTPS://ORCID.ORG/0000-0002-1079-0929
LIZHI XU SCHOOL OF MECHANICAL ENGINEERING, NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY, NANJING, JIANGSU 210094, P.R. CHINA HTTPS://ORCID.ORG/0000-0002-8966-7201
ZHONGHUA DU SCHOOL OF MECHANICAL ENGINEERING, NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY, NANJING, JIANGSU 210094, P.R. CHINA HTTPS://ORCID.ORG/0000-0002-8673-5926
GUANGFA GAO SCHOOL OF MECHANICAL ENGINEERING, NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY, NANJING, JIANGSU 210094, P.R. CHINA HTTPS://ORCID.ORG/0000-0002-1729-352X

DOI:

https://doi.org/10.1590/1679-78256268

Abstract

THE CONSTANT STRAIN RATE LOADING AND DYNAMIC STRESS EQUILIBRIUM ARE PREREQUISITES FOR ENSURING THE EXPERIMENTAL DATA OF SPLIT HOPKINSON PRESSURE BAR (SHPB). IN ORDER TO ACHIEVE THIS REQUIREMENT, A PROPER PULSE SHAPER DIMENSIONS IS USED IN EXPERIMENT. FOR THIS PURPOSE, THE PULSE SHAPER DIAMETER, THICKNESS AND STRENGTH AND THE STRIKE BAR LENGTH AND ITS VELOCITY ON THE INCIDENT PULSE ARE STUDIED BY ∅80MM SHPB DEVICE. THEN, THE PARAMETERS EFFECTING THE TWO KEY INFLECTION POINTS AND THREE LOADING AREAS OF INCIDENT PULSE ARE DISCUSSED. IN ADDITION, AN IMPROVED METHOD FOR TWO TYPICAL NON-CONSTANT STRAIN RATE WAVEFORMS FOR CONCRETE EXPERIMENT IS OBTAINED BASED ON THE REGULAR OF PULSE SHAPING. MOREOVER, SHPB EXPERIMENTS ARE CONDUCTED FOR CONCRETE BY EMPLOYING DIFFERENT PULSE SHAPER DIMENSIONS. THE RESULTS SHOW THAT MORE VALID DATA CAN BE OBTAINED BY EMPLOYING THE PULSE SHAPER WITH LARGE THICKNESS WHEN THE STRAIN RATE IS NON-CONSTANT DURING THE EXPERIMENT. WHETHER OR NOT CONSTANT STRAIN RATE LOADING MAINLY AFFECTS THE DYNAMIC COMPRESSIVE STRENGTH, BUT HAS LITTLE EFFECT ON THE DYNAMIC MODULUS. THE CONCLUSIONS AND METHOD PROVIDE GUIDANCE FOR THE SELECTING PULSE SHAPER FOR CONCRETE SHPB EXPERIMENTS.

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Published

2021-01-07

Issue

Vol. 18 No. 1 (2021)

Section

Articles

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