Finite Element Analysis on Shearing Process

• Main Authors: Mr. Jiang, 簡木發
• Other Authors: Chang
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/74497475356336490115

碩士 === 國立中央大學 === 機械工程研究所 === 81 === The major objective of present paper was to investigate the deformation of the sheet metal during a shearing process using the finite element techinque. We investigated the inflenuce of material properties and punch and die clearence on the maximun punch force. In shearing process, the state of the workpiece is from elasticity to plasticity ,and then to fracture. We created a model of elasticity--plasticity, and introduced the concept of forming limits to determine the crack-initiation.We used a finite element program MARC to set up a 3D model and to slove the state of workpiece.From the postdata of MENTAT, we can plot the deformation ,strain and stress of a shearing process by a contour plot. This helps us to know the state of workpiece very clearly in shearing process. Analyzing results show that total punch force does not vary with the clearance when working piece thickness remains constant. Furthermore, friction durning the shearing processes also was considered. However, no evidence showed that friction is a dominant factor. The thinkness of workpiece and the yiled stress influence the maximun punch force.