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Failure mechanism for metal cylinder under explosive loading
노동환,서송원,이재근,Minki Jang,윤정환 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.9
This paper presents the numerical study of dynamic fracture for metal cylinder under internal explosive loading. Also, the effects of fracture models and groove designs on fracture behavior are investigated. For the dynamic hardening behavior, the Lim-Huh model including the thermal softening effect is adopted [1, 2]. Also, the Lou-Huh fracture model considering the strain rate dependency is used for fracture prediction [3]. The tensile fracture occurs first at the outer surface, and the shear fracture is observed near the inner surface. In addition, finite element analyses are performed to study the effect of various groove designs on dynamic fracture; single U-groove and V-groove at the outer surface. The tensile and shear fracture lines are predicted near the groove tip and inner surface, respectively. It is concluded that the stress triaxiality parameter is one of the critical factors in the dynamic fracture prediction of the metal cylinder.
船荷證券의 EDI化에 따른 問題點과 改善方案에 관한 硏究
盧東煥 경인여자대학 1998 경인논집 Vol.- No.7
The purpose of this study is to analysis the legal and commercial problems associated with the use of electronic bill of lading. The study further suggests some solutions to these problems. The problems are as follows. At first, Carriers should be taken up additional responsibility and expenses. Second, It is very difficult to secure the function of orignal of the private key system, Third, There are some disputes on the point of offer and acceptance time in the carriage contracts and responsibility of participants. Some ways to improve these problems are to establish central register organization, to replace the private key system by the digitized signature system, and to make individual agreement between the parties.