Stress Distribution In Iron Boron Matrix Composites Reinforced By Fiber

Iron-boron alloy has good performance on thermal conduction and corrosion resistance to liquid metal. It can be used as protection material of internal heating source in the hot dip galvanizing industry. But the Fe-B compound with poor mechanical property is easy to fracture which limits its application in industry more widely. The safety and service life of brittle alloy parts can be improved by adding continuous fiber.In this paper, the two-dimensional plane stress model of composite is established for the numerical simulation of finite element model. The residual stress distribution of composite, the failure strength of composite under tension, the effect on the failure strength of the interfacial bonding strength are all studied.The results show that along the fiber axis in composite, the matrix is subjected tensile stress but the fiber's is in compression. The residual matrix tensile stress increases while the fiber residual compressive stress decreases with the increase of fiber volume fraction. The changing level of stress is much bigger in matrix than in fiber. The increase of fiber volume fraction of composite will help to improve the failure strength, and strong bonding interface has the ability to resist more damage and failure. In the factors affecting the interface bonding strength, the interface shear strength has the greatest influence on the failure strength of composite. In the same bonding strength conditions, the Mo fiber composite failure strength is higher than the carbon fiber composite failure strength.The fiber reinforced iron-boron matrix composite is fabricated by casting and the mechanical properties of composite are tested. The results show that the simulation results agree with the experimental data very well. Based on the numerical simulations conclusions, it will supply a theory support on the design of continuous fiber reinforced composites.