金属自由表面断裂的实验研究  

Study on Free Surface Fracture in Upsetting Test

作　　者：嵇国金[1] 邱嘉杰[1] 

机构地区：[1]同济大学航空航天与力学学院,上海200092

出　　处：《锻压装备与制造技术》2008年第4期70-72,共3页China Metalforming Equipment & Manufacturing Technology

摘　　要：给出了LY12铝合金试样在不同镦粗条件下的实验结果。实验结果表明:工、模具间的摩擦条件对金属自由表面断裂有很大的影响,而试样高径比对自由表面断裂的影响较小。利用实验所获得数据对广泛使用的Cockroft&Latham经验断裂准则在确定金属可加工性能的能力方面进行了评价。结果表明Cockroft&Latham韧性断裂准则计算结果与实验结果比较吻合。Test results of free surface fracture of LY12 Aluminum alloy material under different upsetting testing conditions have been presented.The friction conditions between die and workpiece have a marked effect on free surface facture, while the aspect ratios have small effect.Combined with the result data, Cockroft ＆ Latham ductile fracture criterion in wide use has been used to predict the free surface fracture.It is shown that the criterion is in accordance with the test result.

关 键 词：机械制造 镦粗 铝合金 断裂准则 

分 类 号：TG316.11[金属学及工艺—金属压力加工] TG319