Abstract
AFFECTED BY THE INERTIA EFFECT, REAL RATE EFFECT AND END FRICTION EFFECT (ONLY EXISTED IN SPLITTING AND SPALLING TESTS), THE EXPERIMENTAL TENSILE STRENGTH OF CONCRETE-LIKE MATERIALS GREATLY INCREASES WITH THE LOADING-RATE OR STRAIN-RATE. TO FURTHER INVESTIGATE THE INFLUENCE DEGREE OF REAL RATE EFFECT FOR CONCRETE-LIKE MATERIALS IN DYNAMIC TENSILE TESTS, THIS PAPER SYSTEMATICALLY CONDUCTS EXPERIMENTAL RESEARCH TO STUDY DYNAMIC BEHAVIORS OF CONCRETE-LIKE MATERIALS IN TENSILE EXPERIMENTS, VIZ. DIRECT TENSILE TESTS, SPLITTING TESTS AND SPALLING TESTS. AT THE SAME TIME, FINITE ELEMENT SIMULATIONS ARE EMPLOYED TO ANALYZE THE MECHANICAL CHARACTERISTICS OF CONCRETE-LIKE MATERIALS, WHERE A HYDROSTATIC PRESSURE DEPENDENT MODEL, THE DRUCKER-PRAGER CONSTITUTIVE MODEL, IS USED FOR SPECIMENS, WHICH CAN CONSIDER THE INFLUENCE OF INERTIA EFFECT. IN THE NUMERICAL MODEL, THE SPECIMEN IS SET WITH RATE-INDEPENDENCY, THUS THE PREDICTED DYNAMIC TENSILE STRENGTH OF SPECIMENS IS FREE OF THE REAL RATE EFFECT. THE END FRICTION EFFECT IS ALSO TAKEN INTO ACCOUNT IN THE NUMERICAL ANALYSIS OF DYNAMIC SPLITTING AND SPALLING TESTS. IT IS FOUND THAT THE DYNAMIC TENSILE STRENGTH ENHANCEMENT OF CONCRETE-LIKE MATERIALS IN NUMERICAL SIMULATIONS DOES NOT VARY OBVIOUSLY WITH LOADING-RATES, WHICH INDICATES THAT THE INERTIA EFFECT AND END FRICTION EFFECT MAKE LITTLE CONTRIBUTIONS TO THE DYNAMIC INCREASE FACTOR (DIF) OF CONCRETE-LIKE MATERIALS. THEREFORE, THE REAL RATE EFFECT DOMINATES THE DYNAMIC TENSILE STRENGTH ENHANCEMENT OF CONCRETE-LIKE MATERIALS IN LABORATORY TESTS, BUT THE INERTIA EFFECT AND END FRICTION EFFECT DO NOT.
Highlights
Concrete-like materials take significant parts in infrastructure and defense engineering, whose mechanical properties have already attracted much attention from structural designers and scientific202 S
Lu et al (2014) investigated the dynamic compressive behavior of recycled aggregate concrete specimens prepared with five different amount of recycled coarse aggregate [i.e. 0, 25%, 50%, 75%, and 100%], and the results show that recycled aggregate concrete exhibits strong rate dependency
This paper conducts laboratory experiments and numerical simulations to study the influence of end friction, inertia and real rate effect on tensile dynamic increase factor (DIF) of concrete-like materials
Summary
Concrete-like materials take significant parts in infrastructure and defense engineering, whose mechanical properties have already attracted much attention from structural designers and scientific. Zhang et al / Further Investigation on the Real Rate Effect of Dynamic Tensile Strength for Concrete-Like Materials researchers. It is believed that the dynamic strength enhancement of concrete-like materials may have correlation with end friction, inertia and real rate effect in SHPB or SHTB tests. Lu et al (2011) employed a hydrostatic-stress-dependent macroscopic model without considering strain-rate effect in numerical simulations of three types of dynamic tensile tests, viz. Between numerical simulation and experimental study, differences may exist in specimens, and the geometries and mechanical properties of the testing set-up These differences will threaten the reliability to some degree of the conclusions made before. The numerical results from rate insensitive model are compared with experimental results, to further reveal the influence of real rate effect on concrete-like materials under dynamic tension.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
