Research Of Failure Mechanisms Of Bulk Metallic Glass Composites Based On Finite Element Simulation

As a new type of material,metallic glass has excellent mechanical,physical and chemical properties,and has broad application prospects.In this paper,the fracture failure mechanism of metal glass matrix composites is analyzed by experimental observation,and the finite element model is established to simulate the damage evolution of the interface and the effect of interface on the deformation behavior of composite materials.The research results have some reference value,which helps to understand the deformation and failure mechanism of metal glass matrix composites.The main work is as follows:Tensile fracture ofTi₃₂.₈Zr₃₀.₂Ni_5.3Cu₉ Be_22.7metal glass andTi₄₅.₇Z r_{3 3}N i ₃Cu₅.₈Be_12.5metal glass composites are examined by Scanning electron microscopy.The results showed that the extended dendritic phase can effectively prevent the shear zone,so that the whole plastic composites are improved.Ta particle reinforced?7?Zr_{7 0}Ni_{1 0}Cu₂₀?8?₇₈Ta_{1 2}Al_{1 0}metal glass composites during three point bending test The compression side Ta particles by extrusion and broken,some fall off;the tensile surface was not obviously observed Ta particle fracture phenomenon,the main phenomenon is the edge of the peel Ta particles and the matrix,resulting in crack initiation and final fracture.By using the finite element software ABAQUS,the uniaxial tensile behavior of the metal glass matrix composite was simulated by the user subroutine?UMAT?.The cohesive unit is introduced to simulate the damage evolution process of the interface.The whole failure process of the matrix and particle in the metal glass matrix composite has three stages:the interface remains intact and the whole system is in the linear elastic stage when the load is small.With the increase of external force,when the interfacial yield stress reaches the interface strength,the interface begins to damage and damage,until the interface is completely debonded,the particles are stripped,and there is no interaction between the matrix and the particles.Under the weak interface,the effects of the second phase particles,different material parameters and interface parameters on the shear band evolution and the toughness of the composites are considered.Compared with the uniform distribution and random distribution of the particles,it can be obtained that the toughened particles are evenly distributed in the matrix of the metal glass composite material,which can make the composite material more uniform and improve the strength and toughness of the composite.With the increase of the particle volume fraction,the overall stress level of the composite is reduced;the interfacial elasticity is reduced.The increase of the modulus of sexual modulus can effectively promote the stress transfer between the matrix and the particles,and thus improve the toughness of the composite.In a certain range,the overall stress level of the composite decreases with the increase of the thickness of the interface.