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Influence of back stresses in parts forming on crashworthiness
Lee, Myoung-Gyu,Han, Chung-Souk,Chung, Kwansoo,Youn, Jae Ryoun,Kang, Tae Jin Elsevier 2005 Journal of materials processing technology Vol.168 No.1
<P><B>Abstract</B></P><P>The influence of back stresses during forming processes of sheet parts on subsequent crashworthiness is investigated in this article. To this aim, the simulation results of crash analysis applying material formulations with and without kinematic hardening are compared. It is found that the relevance of the back stresses in comparison with other variables defining the initial state of structural parts for the crash analysis varies depending on the amount of the plastic strain induced in the forming process. However, the influence of the back stresses during forming is not a priori negligible. For accurate and reliable simulations it is therefore recommended to incorporate and transfer the back stresses as well as other internal variables for the simulations of forming and crashworthy analysis.</P>
Systematic Studies of Aging Effects in RPCs for the CMS/LHC Experiment
Sungkeun Park,이경세,Byung Il Kim,홍병식,Dong Ho Mun,Duk Kil Koo,Jeong Ku Lim,이준택,Kwang Bok Lee,Kwang-Souk Sim,Mikiko Ito,MIn Sang Ryu,Sang Ryeol Bahk,이석재,홍성종,남순권,Sunghwan Ahn,Tae Im Kang,Woo Jin Park,김용은,김 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.2
An intensive aging study for the forward resistive plate chambers (RPCs) was performed by using a 200 mCi 137Cs gamma-ray source. For the systematic aging study, four double-gap RPCs, 40 £ 40 cm2, were manufactured and tested for cosmic muons and the gamma rays irradiated from the source. The aging of the RPC gap is expected to be proportional to the integrated avalanche charge per unit area of the RPC. In this paper, a few diagnostic methods to observe aging phenomena are discussed, and the test result for a gamma irradiation of 150 days are presented. The integrated avalanche charge per unit area induced by the gamma rays in the RPC gap was 0.23 C/cm2/gap on average, which is equivalent to approximately 12 years of Compact Muon Solenoid (CMS) RPC operation.