可剥垫片普通冲裁分层机理研究

可剥垫片又称层撕垫片,由多层片状材料黏合而成,常用于调节装配间隙,在飞机制造过程中发挥着重要的作用。现有可剥垫片的制造方式主要是机械铣切和普通冲裁,这两种下料方式都有可能在剪切边缘出现分层问题。针对可剥垫片普通冲裁工艺中剪切面上出现的分层问题进行了试验研究,建立了可剥垫片的普通冲裁的二维有限元仿真模型,模型采用了Cockroft-Latham损伤模型对冲裁过程中断面损伤进行了分析。结合仿真与试验结果,发现普通冲裁过程中,金属不同的变形行为是出现分层的主要原因。

Research on Delamination Mechanism of Conventional Blanking for Laminated Shim Stock

Laminated shim stock,also known as peelable shims,is made of multi-layer sheet materials.Laminated shim stock is often used to adjust the assembly clearance and plays an important role in the aircraft manufacturing process.The existing manufacturing methods of the laminated shim stock is mainly mechanical milling and conventional blanking,both of which might have delamination phenomenon.In this research,the delamination on the sheared edge in the conventional blanking process of the laminated shim stock is studied.A conventional blanking finite element model of the laminated shim stock is established as well,the Cockroft-Latham damage model is used to analyze damage in the blanking process.It is found from the results of simulation and experiment that the various material behaviors of cross section is the main cause of delamination on the sheared edge.