Method for calculating stress-strain response of metal-based composite material under spectral load

The invention discloses a method for calculating stress-strain response of a metal-based composite material under a spectral load. The method comprises the following steps: solving stress borne by a composite material matrix and fibers at a crack plane of a unit cell model based on the unit cell model with a matrix crack length; dividing a matrix and fibers of the unit cell model with the cracks into n units; establishing a friction slip model containing a matrix crack length; determining the yield condition of the SiC/Ti composite material matrix, judging whether the matrix enters plastic yield or not, and solving the stress borne by the composite material matrix and fibers at the crack plane after the unit cell model with the cracks enters plastic yield; solving the interface shear stress and the stress strain of the fiber and the matrix when the non-boundary unit of the matrix yields; carrying out matrix and fiber strain coordination judgment; solving average stress-strain of a characteristic unit, a matri