Abstract: A elastic-plastic mechanics analysis method is used to establish a analytical model of thin strip wave-shaped defects leveling mechanism, analyzing the initial wave shape, strength of materials, dimension of strip and other input conditions such as the size of the radius of curvature, global tension at the outer end, etc. Through straightening performance of wave-shaped steel can be significantly improved. The width of plastic zone of strip after processing is defined and analyzed and it is taken as an intermediate variable to establish the relationship among various strip parameters, strength of material and process parameters, and further multivariable differential equations with respect to prediction model of wave-shaped defect’s leveling improvement would be derived. In order to verify the correctness of the model, the article analyzes the impact of inputs as initial wave shape, strength, dimensions and process parameters like the radius of curvature, tension on the improved performance after straightening. Furthermore, a finite element method (FEM) model of tension leveling process in the same conditions and dimensions with analytical model is also created to verify and contrast the relevant conclusions and good agreement is achieved between two models. Analysis and modeling ideas in article are equally applicable to all forms of stretch bending, tension leveler, multi-roller straightening and other similar process.

Key words: analytical method, finite element, plasticity deformation, tension leveling, wave-shaped