Method and device for determining stress distribution of gradient functional material ball structure

The invention relates to the field of nondestructive testing of functional gradient materials, and provides a method and a device for determining stress distribution of a functional gradient material ball structure. The method comprises the following steps: establishing a gradient functional material sphere structure model based on a preset material type, averagely dividing a gradient functional material layer in the model into a plurality of shell layers from inside to outside, establishing a control equation of each shell layer, determining a stress general solution of each shell layer according to an elastic mechanics theory and the control equation, and determining a gradient functional material sphere structure based on the stress general solution and a preset boundary condition. The method comprises the following steps: determining a stress relationship between all shell layers according to a stress general solution, determining a stress relationship between the innermost shell layer and the outermost s