Numerical Simulation To Effect Of Interfacial Mechanical Property On Pull-out Mechanical Properties Of Fiber Reinforced Concrete Preiiminarily

Fiber reinforced concrete possess high strength, high toughness, high durability and goodanti-fatigue performance etc, and it is one of the composite materials is the most widely usedin the engineering. The interface is extremely important microstructure, it is connection linkwith fiber and concrete, it is the bridge to transmit stress and other information bridge, it playimportant influence on the macro properties. Now most of the theory research is based on thepremise, and has certain difference with a real non-uniform material. This paper inconsidering the material is not evenly distributed, under the premise of by finite elementnumerical simulation method to analyze the interface of fiber reinforced concrete performanceimpact. Classical mechanics is the foundation of the traditional finite element calculation,reflect material to the state of stress-strain for a bit, the numerical simulation software candestructive process. This provide the theory and design guidance to fiber reinforced concreteof the optimization of the interface and the overall performance.By studying the effect of interface the damage mechanism and macro-mechanics featureof the fiber reinforced concrete which underpins by numerical program developed based onmacro-damage mechanical and simulation of damage and fracture process of the gap with thefiber reinforced concrete samples, it is reasonable to draw the conclusion that the fiberreinforced concrete turn up brittle failure, fracture along the horizontal direction gap. But thefiber reinforced concrete with interface turn up ductile fracture, fracture along the horizontaldirection gap with that extended to the interface, interface have a effect on toughness,improve fiber reinforced concrete toughness and energy consumption capability. And someimportant phenomena such as the interface debonding and sliding.crack deflexion.fiberbringing and pulling out have been successfully reproduced and revealed.Fiber pull out test is one of the important physical tests which used to measure theinterfacial strength of the fiber reinforced composite. There are plenty of research techniquesadopted the model of pull-out test, however little can simulate the process of fiber pulling outand a new numerical simulation software is employed in this paper. From the simulation, itcan be concluded that firstly, by analyzing the distribution about the stress in the sample, themechanics of the interface between the matrix and the fiber could be understood clearly;secondly, the process of interface debonding is asymmetrical, which is more real thansymmetrical one; Lastly, the distribution of stress in the interface debouding shows that it islimited to use the axial symmetrical model to simulate the process of the fiber pull out test. Asa result, the interface of fiber reinforced composites has always been a critical part in engineering. This paper, which is focused on fiber-concrete composites, makes someexperimental studies on the interfacial stress behaviors, analyzes mechanism of the fiberreinforcement, toughness, and failure-resistance, and discusses characteristics and patterns ofthe stress and strain near the interface, and therefore to provide some valuable experimentaldata for the setup of interfacial mechanical model of fiber-concrete composites.The Process of interface modulus and strength on fiber pull out test reinforced concretehas been studied in this paper. Considering the material non-uniform distribution of intimacy,the simulation involves that FRP fiber pull out test that reinforced concrete samples. Theresult illustrates that: the higher is strength of bond, the higher is the fiber of ultimate strength;the smaller is the interface elastic modulus, the better is specimen deformation capacity andtoughness. Based on the fact that interface stress transfer that is made to meet the premise ofstrength as well as the interfacial properties of the fiber peeling performance impact, it tisproved that the texture of interface improves fiber reinforced concrete toughness andreinforced material destruction capability of energy consumption.