http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Low-Velocity Impact Characterization of Composite Plate by Direct Numerical Simulation(DNS)
Kim, Seung-Jo,Ji, Kuk-Hyun 서울대학교 항공우주신기술연구소 2000 항공우주신기술연구소 연구보고 Vol.1 No.2
In this paper, the low-velocity impact behavior is analyzed by the Direct Numerical Simulation(DNS) approach. In DNS approach, we discretize the composite plates through separate modelling of fiber and matrix for the three dimensional analysis since we believe that the impact behavior, specially, damage due to low-velocity impact highly depend on the local microscopic arrangements of composite materials as mixture. A general explicit finite element code, LS/DYNA 3D installed in IBM SP2 of Seoul National University, is used for the DNS. The DNS simulation results of the impact event by low-velocity(10m/s) aluminuum projectile are compared with the ones by the homogenized model and the impact damages, fiber-breakage, matrix cracking and delamination etc. are examined in the microscopic sense.
Supercomputing by Internet Based PCs
Kim, Seung-Jo,Cho, Jin-Yeon,Lee, Chang-Sung,Cho, Chul-Hoon,Ji, Kuk-Hyun 서울대학교 항공우주신기술연구소 2000 항공우주신기술연구소 연구보고 Vol.1 No.2
In this work, Internet Supercomputing methodology is introduced and the concept is realized for large-scale finite element analysis. The primary resources of Supercomputing by Internet based PCs are numerous idling PCs connected through Internet with no regards to their locations. The computing ability of hundreds or thousands PCs networked by Internet can be as powerful as that of supercomputer such as CRAY T3E if these PCs are utilized for solving a problem simultaneously through an efficient parallel computing algorithm. Under the above concept, a virtual supercomputing system InterSup I is constructed and tested. To establish the InterSup I system, 64 PC nodes, which are located in several places and connected by Internet, are conscripted. By the established InterSup I system, linear static analyses of finite element model having around five million DOFs are solved through the parallel multifrontal solver and the time dependent behaviors of structures are investigated with parallel explicit algorithm. Also, the eigen value analyses are conducted through the block Lanczos procedure and parallel multifrontal technique. From these supercomputing results, Supercomputing by Internet based PCs can be considered as one of the cheapest ways as well as one of the most powerful ways to high performance computing (HPC) such as large-scale finite element analysis.