Stress-Based Forming Limits in Sheet-Metal Forming  

Oleh:

Stoughton, Thomas B.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Engineering Materials and Technology vol. 123 no. 4 (2001), page 417-422.
Topik: METAL; stress - based forming; limits; sheet - metal; forming

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ87.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

A strain - based forming limit criterion is widely used throughout the sheet - metal forming industry to gauge the stability of the deformed material with respect to the development of a localized neck prior to fracture. This criterion is strictly valid only when the strain path is linear throughout the deformation process. There is significant data that shows a strong and complex dependence of the limit criterion on the strain path. Unfortunately, the strain path is never linear in secondary forming and hydro - forming processes. Furthermore, the path is often found to be non linear in localized critical areas in the first draw die. Therefore, the conventional practice of using a path - independent strain - based forming limit criterion often leads to erroneous assessments of forming severity. Recently it has been reported that a stress - based forming limit criterion appears to exhibit no strain - path dependencies. Subsequently, it has been suggested that this effect is not real, but is due to the saturation of the stress - strain relation. This paper will review and compare the strain - based and stress-based forming limit criteria, looking at a number of factors that are involved in the definition of the stress - based forming limit, including the role of the stress - strain relation.

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