The stress field of crack tips of linear elastic orthotropic composite plates under the acts of bending and torque is analyzed.The fracture problem can be solved by calculating the boundary value of a partial differential equation.By the methods of complex variable function and undetermined coefficients

the formulae for deflection

displacement

bending moment

torque

stress and strains near the crack tip are derived.Finally

numerical examples are given.These formulae have certain practical value and referential function in related fracture analysis.