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Fracture mechanism of AISI 1025 rod shearing in automatic multi-stage cold forging and critical shearing speed

Authors
Kim, K.M.Byun, J.B.Jeong, J.Kim, J.G.Hong, S.M.Lee, K.H.Chung, W.J.Joun, M.S.
Issue Date
Sep-2022
Publisher
Pergamon Press Ltd.
Keywords
Automatic multi-stage cold forging; Coil-rod shearing; Critical shearing speed; Speed effect; Strain rate embrittlement
Citation
Engineering Fracture Mechanics, v.272
Indexed
SCIE
SCOPUS
Journal Title
Engineering Fracture Mechanics
Volume
272
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/2711
DOI
10.1016/j.engfracmech.2022.108679
ISSN
0013-7944
1873-7315
Abstract
Experimental and numerical studies on shearing processes that focused on automatic multi-stage cold forging (AMSCF) are conducted to reveal the mechanisms of the fracture phenomena that occur in the cold rod shearing process in AMSCF. First, AISI 1025 (treated for AMSCF, specifically called SWCH25F) coil-rod of radius 17.5 mm was straightened and cut by an AMSCF machine at operating speeds of 20?90 rpm to elucidate the effects of speed on the surface quality of the sheared billet. Second, a universal testing machine was used in combination with a special shearing apparatus for experimental cold rod shearing to measure the shearing load-time (or stroke) curve and examine fracture mechanisms at sufficiently low speeds. Fractographical observations showed that speed clearly affects the cold shearing of a straightened coil-rod. The surfaces of billets sheared at low speeds showed clear evidence of ductile fracture, whereas those sheared at normal speeds did not. The experimental results were used in thermoviscoplastic finite element (FE) analysis together with the flow behaviors of the material in the cold-forging temperature range to explain the brittle fracture of the ductile material during cold coil-rod shearing in AMSCF. The concept of a critical coil-rod shearing speed for acceptable surface quality is presented. ? 2022
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공학계열 > Dept.of Materials Engineering and Convergence Technology > Journal Articles
공학계열 > 기계항공우주공학부 > Journal Articles

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Kim, Jung Gi
대학원 (나노신소재융합공학과)
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