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

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.

[1]  Zhihua Wang,et al.  Dynamic compressive and splitting tensile tests on mortar using split Hopkinson pressure bar technique , 2015 .

[2]  Yong Cai,et al.  Experimental study on granite and the determination of its true strain-rate effect , 2015 .

[3]  H. Hao,et al.  Influence of end friction confinement on impact tests of concrete material at high strain rate , 2013 .

[4]  Qingming Li,et al.  About the dynamic uniaxial tensile strength of concrete-like materials , 2011 .

[5]  G. Ruiz,et al.  Effect of loading rate on crack velocities in HSC , 2010 .

[6]  F. Huang,et al.  Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part I: Experiments , 2009 .

[7]  L. Zhang,et al.  An Experimental Technique for Spalling of Concrete , 2009 .

[8]  Demetrios M. Cotsovos,et al.  Numerical investigation of concrete subjected to high rates of uniaxial tensile loading , 2008 .

[9]  F. Donze,et al.  Discrete element modelling of concrete submitted to dynamic loading at high strain rates , 2004 .

[10]  Fabrice Gatuingt,et al.  Inelastic behavior modelling of concrete in low and high strain rate dynamics , 2003 .

[11]  Min Zhou,et al.  Dynamic behavior of concrete at high strain rates and pressures: II. numerical simulation , 2001 .

[12]  Yubin Lu.  DYNAMIC COMPRESSIVE BEHAVIOR OF RECYCLED AGGREGATE CONCRETE BASED ON SPLIT HOPKINSON PRESSURE BAR TESTS , 2014 .

[13]  Hong Hao,et al.  NUMERICAL ANALYSIS OF CONCRETE MATERIAL PROPERTIES AT HIGH STRAIN RATE UNDER DIRECT TENSION , 2011 .

[14]  Z. Lei,et al.  A novel experimental technique to determine the spalling strength of concretes , 2006 .

[15]  Qingming Li,et al.  About the dynamic strength enhancement of concrete-like materials in a split Hopkinson pressure bar test , 2003 .

[16]  F. Gatuingt,et al.  Inelastic behavior modelling of concrete in dynamics , 2003 .

[17]  C. Mariotti,et al.  Experimental and numerical study of concrete at high strain rates in tension , 2001 .

[18]  Joseph W. Tedesco,et al.  Numerical analysis of dynamic split cylinder tests , 1989 .