多变载荷路径下复杂钣金曲面多构型展开算法研究

项目名称： 多变载荷路径下复杂钣金曲面多构型展开算法研究

项目编号： No.51505408

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 机械、仪表工业

项目作者： 夏建生

作者单位： 盐城工学院

项目金额： 20万元

中文摘要： 在金属板料成形过程中，精确的毛坯设计可以节约材料，改善成形性能。钣金成形过程是一个非比例加载且路径相关的大变形弹塑性力学问题，针对目前广泛应用的有限元逆向法，仅考虑初始态和最终变形态，没有充分考虑中间的变形历程，其模拟精度存在一定的误差。本项目综合考虑模具、工艺、材料性能等多因素的影响，借助真实工况下的实验数据，运用计算机模拟与数学分析相结合的手段，探讨板料与模具间的弹塑性接触机理，建立等效载荷模型；在塑性流动理论指导下，借助多构型理论及等效力思想，建立多变载荷路径下复杂钣金曲面多构型展开算法，应用有限元增量法和冲压实验相结合的方法进行实例验证。本项目的实施为提高复杂钣金件展开精度提供理论基础。

中文关键词： 钣金；多构型；展开；算法

英文摘要： In the process of sheet metal forming, accurate blank design can save material, enhance the sheet metal forming. Sheet metal forming process is the process that is a large deformation elastic non proportional loading and path dependent plasticity mechanics problem. The finite element inverse method is used for the complex sheet metal parts to unfold, considering only of the initial state and final change form, without considering the deformation history, there will be a certain simulation accuracy error. Considering of the influence of mold structure, stamping process, material properties and other factors, compare the real data of experiments, with the comprehensive means of a combination of computer simulation and mathematical analysis, research the Elastoplastic contact model between the sheet metal andmold; establish the equivalent load model. Based on the elastoplastic constitutive integration equation of plastic flow theory, with the help of intermediate configuration theory and equivalent force idea, derivation a new Algorithm of Complex Sheet Metal Part Unfold based on Multi configurations Changeable load under Changeable load path, combined with finite element incremental method and stamping test to ascertainewith facts. Application of the research provides a theoretical basis for the optimization of subsequent forming process.

英文关键词： Sheet Metal;Multi configurations ;Unfolding;Algorithm