| Carbon fiber reinforced composites has been widely used in aeronautic, astronautic, automotive, wind power and sports equipment industries due to the lightweight, high specific modulus/strength, high temperature/corrosion resistance and excellent designability. However, the separation surface is still exists in a large number because of design requirements and production process. Bolted joints have became the first choice for the whole structure design of composite because of its strong reliability, simple disassembly process and environmental insensitivity. As brittle anisotropic material, design method that used in metal material no longer available on composite structure design. In view of the above situation, this paper will carry on the research via experiments and numerical simulation method, focus on studying the mechanical properties and failure mode of carbon fiber composite bolted joints, expecting that the corresponding mechanical properties of thoes structures could be useful reference for engineering application.The main work are as follows:Firstly, a brief classified analysis of influence factors of composite material bolted joint has been given. The 5 main factors are: geometric parameter, material parameter, fastener parameter, load factor and environmental factor.Secondly, a brief introduction of theoretical knowledge on composite material strength analysis of bolted joint is made. Including the classical laminate theory, strength analysis method and strength criterion of composite material.Then, the influence of pore size and position on the joint strength and failure mode of carbon fiber composite single bolt joint structure was analyzed by experiment and finite element simulation. By finite element simulation, the influence of geometrical factors on the joint strength and failure mode of double bolts joints structure was given, obtained the optimal parameter design.Finally, by finite element simulation analyzed the influence of geometrical factors and connection mode on the joint strength of carbon fiber composite countersunk bolted joint. |
