基于特征的锻件分类及特征有限元法

综合分析锻件后引入特征技术并归纳锻件的形状及变形特点 ,提出了锻件特征概念并给出锻件形状特征的一般定义和构成 ;采用面向对象技术表示特征 ,提出了锻件特征类的概念模式和具体的参数化数据模型 ;针对有限元分析中复杂多变的约束条件和载荷状况两个关键性因素的表达 ,提出特征类的关联思想。在基于特征的锻件分类基础上 ,把锻件变形归纳为“挤”或“压”两种特征元 ,提出了采用基于特征的有限元法 ,并综合自适应FEM、并行FEM、智能型FEM共同求解大型复杂锻件的变形模拟问题。

Feature-based classification for forging and feature-based numerical simulation

Based on analyzing the form and deforming characters of forging parts, the definitions and construction of forging feature and its form feature are presented, and an feature based classification for forging is developed. The concept model and parameterized data model of the feature class are proposed by introducing object oriented technology. The method of expressing boundary restriction conditions and load conditions, which are complicated and the key factors in FEM simulation, in the feature class construction is discussed and the relation concept of feature classed is presented. Based on the feature based classification for forging, we reduce two types of the parts deforming, which posses the characters of "extrusion" or "upsetting", so that feature based finite element method (FFEM) is presented. In this paper, we develop the idea of integrating FFEM with adaptive FEM, concurrent FEM and knowledge based FEM to simulate the deforming of large complicated forging parts.