关键词: 平面拉弯;力学模型;弹复解析;拉弯试验

Abstract: The mechanical models of profile with rectangular cross-section plane stretch-bending are established based on the basic plane stretch-bending hypotheses which meet the demand of engineering application. Different distribution states of stress and strain on the cross-section after stretch-bending deformation are described in detail. The mathematical expressions of tress and strain are given based on the hypothesis of bilinear hardening material model. The relationships among strain neutral layer, moment, tension and bending radius are derived through integrating of stress. The method of discriminating different distribution states of stress and strain is given. The analytic method for springback of profile with rectangular cross-section plane stretch-bending is obtained. The springback laws are explored by this analytic method. A new set of mold for stretch-bending experiments is designed and the experimental research on stretch-bending of profile with rectangular cross-section is carried out. Based on the physical experiment, the finite element simulation analysis is carried out using finite element analysis software ABAQUS. The springback laws obtained by experiment and finite element analysis are agreed well with the analytical results. This study method provides a theoretical reference for stretch-bending of profile with other cross-section, meanwhile, the study results have certain engineering guidance value.

Key words: plane stretch-bending;mechanical model;springback analysis;stretch-bending experiment