公开(公告)号：US20170326614A1

公开(公告)日：2017-11-16

申请号：US15533149

申请日：2015-12-02

Applicant: PUSAN NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION

Inventor： Jeong Kim ,  Beom Soo KANG ,  Hak Gon NOH

IPC: B21D26/14 ,  B21D26/06

CPC classification number: B21D26/14 ,  B21D26/06

Abstract: A method for forming or deforming a workpiece at a high speed using electroplasticity effect includes: applying a first level of pulse current to the work piece to cause the electroplasticity effect and lower a flow stress of the work piece; and applying a first level of electromagnetic force to the workpiece for 150˜300 μs to form or deform the work piece in a desired shape while the flow stress of the work piece is maintained at the lowered level, wherein the first level of electromagnetic force is lower than a second level of electromagnetic force which is required to form or deform the workpiece in the desired shape without applying the first level of pulse current.

公开(公告)号：US11821877B2

公开(公告)日：2023-11-21

申请号：US17373154

申请日：2021-07-12

Applicant: HYUNDAI MOTOR COMPANY ,  KIA CORPORATION ,  PUSAN NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION

Inventor： Sang Won Lim ,  Sang Yoon Park ,  Yong Beom Lee ,  Sang Jae Yoon ,  Chi Hoon Choi ,  Jeong Kim

IPC: G01N3/307 ,  G01M17/007 ,  G01N3/317

CPC classification number: G01N3/307 ,  G01M17/0078 ,  G01N3/317 ,  G01N2203/001 ,  G01N2203/005 ,  G01N2203/0044

Abstract: The present disclosure relates to an apparatus and a method for an impact test, which can easily accelerate an impact body at a desired acceleration using an air pressure and an electromagnetic force. According to an embodiment of the present disclosure, an apparatus for an impact test includes a clamping unit configured to fix a specimen, and an impact unit disposed to be spaced apart from the clamping unit and configured to accelerate and launch an impact body to collide with the specimen by an air pressure and an electromagnetic force.

公开(公告)号：US20220155197A1

公开(公告)日：2022-05-19

申请号：US17373154

申请日：2021-07-12

Applicant: HYUNDAI MOTOR COMPANY ,  KIA CORPORATION ,  PUSAN NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION

Inventor： Sang Won Lim ,  Sang Yoon Park ,  Yong Beom Lee ,  Sang Jae Yoon ,  Chi Hoon Choi ,  Jeong Kim

IPC: G01N3/307 ,  G01M17/007 ,  G01N3/317

Abstract: The present disclosure relates to an apparatus and a method for an impact test, which can easily accelerate an impact body at a desired acceleration using an air pressure and an electromagnetic force. According to an embodiment of the present disclosure, an apparatus for an impact test includes a clamping unit configured to fix a specimen, and an impact unit disposed to be spaced apart from the clamping unit and configured to accelerate and launch an impact body to collide with the specimen by an air pressure and an electromagnetic force.