Further Investigation on the Real Rate Effect of Dynamic Tensile Strength for Concrete-Like Materials

AUTOR(ES)

Zhang, Shu, Lu, Yubin, Chen, Xing, Teng, Xiao, Yu, Shuisheng

FONTE

Lat. Am. j. solids struct.

DATA DE PUBLICAÇÃO

2016-01

RESUMO

Abstract Based on dynamic direct tensile tests, splitting tests and spalling tests, it is found that the experimental tensile strength of concrete-like materials greatly increases with loading-rate. This kind of dynamic tensile strength enhancement may be caused by the combination influence of the inertia effect, real rate effect and end friction effect (here the end friction effect is only existed in splitting and spalling tests). To further investigate the influence degree of real rate effect for concrete-like materials in dynamic tensile tests, this paper conducts systematically dynamic tensile experiments, viz. dynamic direct tensile tests, splitting tests and spalling tests. At the same time, numerical dynamic tensile tests are employed to analyze the mechanical characteristics of concrete-like materials. A hydrostatic pressure dependent model, the Drucker-Prager constitutive model, is used for concrete-like material specimens, which can consider the influence of inertia effect. In the numerical model, the specimen is set to be rate-independent, 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 of concrete-like materials in numerical simulations does not varies obviously with the loading-rate, indicating that the inertia effect and end friction effect have little contributions to the dynamic tensile strength enhancement 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.

Documentos Relacionados

• Experimental and numerical investigation on the dumbbell-shaped specimen of concrete-like materials under tension
• THEORETICAL EFFECT OF LARGE HYDROSTATIC PRESSURES ON THE TENSILE STRENGTH OF MATERIALS
• Prediction the effects of ZnO2 nanoparticles on splitting tensile strength and water absorption of high strength concrete
• ZrO2 nanoparticles' effects on split tensile strength of self compacting concrete
• Effect of laser welding on the titanium composite tensile bond strength