The Shock Compression Dynamic Performance Experimental Study Of Steel And PVA Hybrid Fiber Reinforced Cement Matrix Composites

Steel-PVA hybrid fiber reinforced cementitious composites is made of adding steel andPVA fibers in the concrete to replace coarse aggregate in concrete material preparation.According to the existing study of fiber reinforced cementitious composites results:(1) Steelfiber can effectively improve the dynamic compressive strength of steel fiber reinforcedconcrete;(2) PVA fiber mainly increase the impact toughness of PVA fiber reinforcedconcrete, etc. Because of this, This topic is proceeing to steel and PVA fiber mixed in certainregularity, It has prepared4kinds of steel and PVA hybrid fiber reinforced cementitiouscomposites in different mixed way. For each matching materials respectively in a single andrepeated dynamic impact compression test, this kind of fiber reinforced cementitiouscomposites are studied the dynamic mechanical properties, the preparation and research offiber reinforced cementitious composites,as well as the design and optimization of thestructure of the corresponding, has important scientific significance and practical value inengineering; via summarizes for access to the test data and analysis of the fiber volumecontent of2%steel and PVA hybrid fiber reinforced cementitious composites in the dynamicmechanical behavior under impact compression load; From the failure pattern, dynamicenhancement effect of ratio of materials and the toughness Angle transverse longitudinalcomparison, analysis of fiber and PVA fiber under four kinds of mixed form the mechanicalproperties of their respective proportion, and the optimum fiber hybrid form.This paper on the study of fiber reinforced cementitious composites at home and abroadare briefly reviewed. Also introduces the dynamic mechanical properties of cement-basedmaterials research status, research shows that the material under the condition of dynamic andstatic mechanical properties has significant difference, but on the study of cement-basedmaterials under high strain rate dynamic impact test data reliability also has certain dispute,description of the dynamic mechanical behavior of this materials are unable to reach a unified.Split hopkinson pressure bar (SHPB) test technology is used to test the materials under highstrain rate dynamic enhancement effect of commonly used test methods, this article has alsofor steel and PVA mixed fiber reinforced cement matrix composites SHPB experimentaltechnique put forward the problems existing in the response of the solution.This paper mainly studies the volume content of2%steel and PVA hybrid fiberreinforced cementitious composites in load stress under the action of dynamic and staticperformance. Quasi static respectively to the ratio of the material and a variety of impactpressure value under uniaxial static and dynamic compression test. In order to guarantee the reliability of the test and the validity of the test data, the SHPB experiment considers theincident wave, the range of strain rate, the main influence factors such as friction and inertiaeffect. Through sorting relevant test data, the several conclusions: fiber on compressivestrength and toughness of cement matrix materials in there is enhancement effect, and thedynamic increase factor and strain rate between the logarithmic curve relationship with; Steeland PVA hybrid fiber reinforced cement matrix composites in different pressure values ofSHPB experiment showed obvious dynamic enhancement, the toughening effect of strain rate,on the overall mechanical performance parameters of it, mixed with this kind of hybrid fibermaterial modification of fiber enhanced obviously, of which the most steel fiber mixed withenhancement effect significantly. And mixed with PVA fiber is beneficial to the improvementof the material under dynamic impact peak strain, and after a comprehensive comparison of3（1%Steel+1%PVA）resistance power capacity the optimal ratio of materials.