Abstract
By using the realistic failure process analysis RFPA<sup>2D</sup>-dynamics software, we establish a dynamic numerical model for twin fibers pull-out test. The microscopic non-uniformity of mechanical properties of concrete materials in different phases is accepted to study the influence of steel fiber volume content under dynamic load on mechanical properties. According to the elastic damage constitutive relationship of the meso-element, the dynamic tensile failure process of specimens with various steel fiber volume content, from micro-cracks initiation, propagation to crack penetration, is studied in details. Furthermore, curves of load-displacement and acoustic emission cumulative energy could also be obtained. The results show that variation of steel fiber volume content has significant influence on the failure pattern of the specimen under dynamic load. With the increase of steel fiber volume fraction, the energy consumption level of specimens first increases and then decreases. When the steel fiber volume fraction is 1.6%, the energy consumption reaches the highest, which is about 1.36 times of that of the plain concrete specimens.
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