Calculation And Design Of The Stress In Fiber-Reinforced Composites

For the material working in liquid zinc, good corrosion resistance to liquid zinc,extremely high heat conductivity and good mechanical properties is needed. Iron-boron alloyhas good corrosion resistance in liquid zinc but poor mechanical properties. Thermal stressor external forces can cause fracture easily during use. The mechanical properties restrict itsapplications in the field of hot galvanization.The Finite element analysis model of fiber-reinforced iron-boron alloy was establishedin this article. Effects of the fiber properties, the fiber direction and the distribution of fibersin the composites on residual thermal stress and tensile strength of the composites werecalculated. Composites with different fibers were calculated and comparatively studied.The results indicate that it is a promising mechanism in improving the strength andtoughness of composites to add fibers in iron-boron alloy. The residual thermal stress andtensile strength increases with the thermal expansion coefficient and the elastic modulus offiber. With the increase of fiber volume fraction, the tensile stress in fiber decreases, thecompression stress in matrix increases, and the tensile strength of composites increases. Witha low tensile strength of fiber, the failure of fiber happens before matrix and doesn'tstrengthen the matrix. When the direction of fiber is parallel to the loading direction, thecomposites have the best mechanics properties.The experiments confirm that the results of simulation will help to reduce the cost ofexperiment, and provides certain theoretical guidance for the design of fiber-reinforcedcomposites.