STUDY OF RESIDUAL STRESS IN SUPER-HYBRID COMPOSITE Ti/CFRP

Ti/CFRP(Ti/Carbon fiber composite) laminate is a new kind of super hybrid composite, which possesses high strength and high modulus. Due to the difference in coefficient of thermal expansion among the component materials, carbon fiber, Ti and resin matrix, in Ti/CFRP and curing of the resin during the manufacturing there exits residual stress in the Ti/CFRP. The residual stress may influence the performance and manufacture of the Ti/CFRP laminate. In this paper the residual stress was studied through testing and calculation. The strain gage embedding and unsymmetrical laminate measuring methods were adopted for the residual stress testing, and the mathematical expressions were concluded for calculation of it. The experimental results and the calculated values are in good agreement.