V型槽几何参数对裂纹萌生的影响规律  

Influence of the Geometric Parameters of the V Shaped Groove on Initialization of Ideal Crack in Precision Cropping

作　　者：化春键[1] 赵升吨[1] 宋涛[1] 张学来[1] 

机构地区：[1]西安交通大学机械工程学院

出　　处：《西安交通大学学报》2004年第9期947-950,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50375117);陕西省自然科学基金资助项目(2003E204).

摘　　要：针对研究新型低应力精密下料系统时,需要获得棒料表面所预制的V型槽几何参数对槽底应力集中水平影响规律的问题,利用MSC.Marc软件,建立了系统棒料下料时的有限元模型.采用正交法设计了实验方案,通过有限元法的数值模拟实验,确定了V型槽几何参数的合理取值条件,即槽外形夹角为90°,槽深与棒料直径的比为0 1,槽底圆角半径与槽深的比为0 08.同时,建立了可以衡量槽底应力集中程度的数学表达式.实验研究表明,槽深、槽底圆角半径对槽底应力集中水平的影响最大,而槽外形夹角对槽底应力集中水平的影响程度最小.To investigate a new type of low stress precision cropping system, it is necessary to obtain the influence of the three geometric parameters of the V shaped groove on the stress concentration near the groove bottom. MCS. Marc software is applied to build the finite element model of the bar, and the experiments are designed by the means of orthogonal method and simulated numerically. The reasonable geometric parameters of the V shaped groove are determined: the flare angle is 90°, the proportion of the groove depth to the diameter of the bar is 0.1, and the proportion of the radius at the groove bottom to the groove depth is 0.08. The mathematical representation which can correctly illustrates the stress concentration at the groove bottom is established. The experimental results show that both the depth and the radius exert an influence on the stress concentration at the groove bottom remarkably, and the influence of the flare angle can be neglected.

关 键 词：棒料 精密下料 应力集中 正交法 有限元法 

分 类 号：TG301[金属学及工艺—金属压力加工]