Mechanical Properties Of Ti/TiC Laminated Composites Based On ANSYS

Preliminary experimental data of Ti/TiC composite laminate show that it has outstanding mechanical properties, especially those with outstanding performance advantage at the fracture performance. However, further material properties data to obtain having a certain degree of difficulty for a simple experimental measurement.Numerical Simulation which based on the Finite Element Method to study mechanical properties of materials has important engineering value to understand the stress-strain curve of material in steady-state and dynamic process, to obtain its crack-tip stress nephogram, to explore the whole process of crack growth and migration.Papers establishment physical models and finite element model and proposed initial boundary and loading conditions in each case, which according to the basic theory of fracture mechanics and combined crack resistance curve, and the theory of knowledge about dynamic equations of motion of extended finite element method used in the dual interface material. Simulation stress-strain curve of materials under static mechanical loading and the dynamic impact effect by using the definition of the structural unit constraint node failure methods and set the laminated contact constraint model to explore the material occurs fracture and crack propagation process and mechanism.The simulation results show that: Strength and stiffness properties mechanical properties of Ti/TiC Laminated been a qualitative improvement compared with the raw materia. When the thickness ratio was 2:1, with the rise of the reaction layer thickness,the bending strength showed growth, when the reaction layer thickness reaches 35μm,bending strength reaches a maximum 1677.92 MPa. When the thickness ratio rising, the flexural strength increased first and then decreased, when the layer thickness ratio was3:1, the bending strength reaches a maximum 3762.94 MPa. The reaction layer volume fraction and the volume fraction of the matrix layer determine the flexural strength of the material together, the bending strength continues to increase with the increase in the volume fraction. Under the action of impact load, when the thickness ratio was 3.5:1,the reaction layer thickness is 24.62μm, the material has a minimum concussion rates2.0m / s, and then the minimal stress is 333.376 MPa, the thickness of the substrate layer and the thickness of the reaction layer determine the impact resistance of the material together. The thickness of the substrate plays a major influence under the impact of action generated volatility and the thickness of the reaction layer leading role in itsmaximum stress. Ti/TiC laminated composite exhibits a layer by layer fracture characteristics relative to the metal Ti sudden fracture mode, crack deflection and segregation along a weak interface continue to occur which largely increased its crack propagation path and consumes energy stored within the material in the process of crack propagation, so that the crack tip stress concentration in remission to a certain degree and enhanced fracture toughness of Ti/TiC laminated composite. Ti/TiC composite laminate stress concentration higher than bilateral crack propagation model when unilateral crack propagation phenomenon occurs and similarly with crack deflection phenomenon occurs. Its internal crack stress intensity factor increases with the reaction layer thickness and thickness ratio, which the influence of reaction layer thickness to dominate and resulting the crack tip stress concentration phenomenon more obvious.