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; Tsukimori, Kazuyuki
PNC TN9410 98-069, 128 Pages, 1998/05
There is a growing tendency to need structural analysis aided expert system, which adopts advanced analysis techniques and is useful adaptive design of large reactor. This report describes about development of the h-version adaptive mesh division function based on Yuge & Iwai method. From points of view about securing of analysis precision, reduction of work to make analysis data and decrease in calculation costs, to analyze smoothly the nonlinear problems is the main object of this system. The h-version adaptive mesh technique is the method that increases locally finite element mesh density, depending on dividing the elements that the absorbed energy quantity exceeds a standard value every increment step. We developed this h-version adaptive mesh division function and incorporate it in the general nonlinear finite element code. For the function this system has, we show the following. (1)It is possible to apply this system to the thermos elastic-plastic nonlinear problem. (2)The provided finite elements (a)4-Node Quadrilateral Plane-Stress Element (b)4-Node Quadrilateral P1ane-Strain Element (c)4-Node Quadrilateral Axisymmetric Solid Element (d)4-Node Layered Shell Element (3)The provided constitutive model (a)Ono-model (b)kinetic hardening rule (c)ORNL 10 cycles hardening rule (4)The repetition technique : Newton-Raphson technique (5)The application possible force type (a)The concentrated forces (b)The distributed forces (c)The self forces (d)The temperature forces (6)It is possible to apply the cyclic repetition force. (7)The dividing the elements technique (a)Rectifying the strain of the element shape depending on the aspect ratio (b)Dividing the elements that the absorbed energy quantity exceeds a standard value every increment step. (c)Add the function of input the plural absorbed energy quantity that is the estimate value of the division elements. The programming and giving the tests about this system was put into by RCCM.
*; Miyake, Osamu; Daigo, Yoshimichi; *
PNC TN941 82-100, 48 Pages, 1982/04
The Computer code LEAP II had been developed in order to analize failure propagation phenomena by the sodium-water reaction in the steam generator of LMFBR. Here reported is verification analysis of the LEAP code by using Runs 14 and 15 test results of Steam Generator Safety Test Facility (SWAT-3). The main results are as follows: (1)As the results of parametric survey, the effects of the significant parameters such as time mesh, jet division number, etc. to the code were understood. (2)In comparison with the test results of Runs 14 and 15 of SWAT-3, the LEAP code can estimate the phenomena conservatively enough.
Tachibana, Toshimichi; Kaneko, Hiromitsu; Honda, Yutaka*
PNC TN841 80-45, 118 Pages, 1980/09
no abstracts in English
Nakajima, Norihiro; Nishida, Akemi; Kawakami, Yoshiaki; Tsuruta, Osamu; Suzuki, Yoshio
no journal, ,
Japan Atomic Energy Agency has been developing the three-dimensional virtual shaking table for earthquake-resistant evaluations in the atomic energy facilities. It is to realize an earthquake proofing reliability examination by analyzing the earthquake-resistant of the large structure on a computer. This is the trial that is going to realize a virtual shaking table examination such as difficult size of the original structures or nuclear power generation facilities while driving on a computer. Authors develop the structure analysis cord of the assembling structure so called FIESTA (Finite Element Structural Analysis for Assembly) as one of the core functions. This is the details analytical method that paid its attention to the behavior between the part of the assembling structure as one means to perform the earthquake-resistant evaluations for such as atomic energy facilities. In this report, it is reported the way of time history response analysis by assembly structural analysis.
