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Enlargement of a Circular Hole in Strain Hardening Materials Under Uniaxial Tension

Memoirs of the Faculty of Engineering, Yamaguchi University Volume 30 Issue 2 Page 305-315
published_at 1980
KJ00000156310.pdf
[fulltext] 967 KB
Title
円孔の変形形状と加工硬化指数について
Enlargement of a Circular Hole in Strain Hardening Materials Under Uniaxial Tension
Creators Takimoto Akio
Creators Nai Masami
Creators Inatomi Toshitaka
Source Identifiers
Deformation contour of a circular hole in a flat thin sheet has been investigated under uniaxial tension by using engineering materials of copper, brass, aluminum and the low carbon steel of SS-41. By elastic and plastic constraints around the hole, especially the strong constraint of the zone about the minimum section in the perforated sheet, the circular holes intrcduced in copper and brass which have strain hardening exponents varying from 0.30 to 0.52 deform into nearly elliptical holes as the tensile load increases. The hole in the aluminum sheet, due to its low exponent of about 0.22,deforms quite differently from the ones in the above materials. The hole in the low carbon steel sheet, having upper and lower yield points and yield elongation, takes in three steps to deform into a nearly elliptical hole. In all cases the diameter (2b) parallel to the tensile axis is elongated and the one (2a) perpendicular to it contracts as the plastic tensile strain increases. The axial ratio (b/a) is shown as functions of the plastic strain applied as well as the strain hardening exponent of materials.
Subjects
機械工学 ( Other)
Languages jpn
Resource Type departmental bulletin paper
Publishers 山口大学工学部
Date Issued 1980
File Version Version of Record
Access Rights open access
Relations
[ISSN]0372-7661
[NCID]AN00244228
Schools 工学部