The Finite Element Analysis Of Mechanical Behavior Of Fiber Reinforced Composites

In recent years, the application and research of the composite material has been heavilypromoted by the development and the innovation of science and technology, and the metalmatrix composites show with strong vitality，due to its characteristics that high strength,highhardness,high modulus of elasticity,high temperature resistance, good wear resistance andsize of machining stability. One of the outstanding representative is the fiber reinforcedaluminum matrix composites which in combination with a series of good qualities such ashigher strength, higher stiffness and lower thermal expansion coefficient,it has became animportant branch of the metal matrix composites and be widely used in aerospace and allkinds of engineering components. Therefore, studies on the mechanical behavior of the fiberreinforced composite material has immeasurable realistic meaning and great economic value.In this paper, several mechanical problems and analysis and research of the performanceof the fiber reinforced aluminum matrix composites were studied basing on the finite elementmodel. The major contents were following:(1) The finite element analysis model of aluminum matrix composites were built,containing a single fiber,and the boundary of the element were set to free edge. Theinfluential factors of composite material stress distribution were studied by the length, radius,elastic modulus, the geometry of the end of the fiber and the load around. We may safelydraw the conclusion that the interaction area of the fiber and the substrate of the compositematerials was expanding as the radius gaining, the length of the fiber can influence the area ofthe stress saturated zoon; the matching of elastic modulus of the fiber and the substrate hashighly effected the stress in the interaction regions, the bigger difference between them, thehigher concentration of the stress, the higher possibility of crack; If the geometry of the endof the fiber is designed for ball, it can be largely eliminate the stress concentration, improvethe stress gradient, reduce the probability of crack; The load around has nothing with bothsaturated zoon and interaction regions, but stress in the matrix grow in linear change with theload around.(2) In order to constraint the border of the element cell, this paper established the finiteelement model with element updating method.The purpose is to improve local deformation caused by the difference between the finite element model and actual model.The change of allthe parameters of this new model refer to the cell model with free boundary,then coMParewith two results.The calculation results show no differ with each other, so we can verify theaccuracy of the model.(3) This paper tries to build a micro drawing mechanical model of steel fiber reinforcedconcrete using the ideas of the finite element model of fiber reinforced aluminum matrixcomposites, then coMPared with the calculation between theoretical and the model, to verifythe correctness of the model and to expand a new consciousness in the development of thetheory and application in engineering of the fiber reinforced concrete.