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Finite element analysis for multi-leaf structures with frictional contact and large deformation

100%

Chen X. , Nakamura K. , Mori M. , Hisaida T.

Computer Assisted Mechanics and Engineering Sciences

2000

tom Vol. 7, No. 1

53-67

The analysis of multi-leaf structures should be performed taking friction into account. The objectivity of friction law should be preserved because large deformation generally occurs. By use of the convected coordinate system, the objectivity can be preserved naturally. Therefore, in finite element analysis, the element local coordinate system can be used. However, when a contact point slides over the element boundary, a problem arises due to the discontinuity of the local coordinates between elements. In this work, an algorithm is proposed, i.e., the formulation is essentially based on the convected coordinate system while the sliding term is redefined as a spatial vector and is calculated in the reference configuration. Thus, the finite sliding due to large deformation can be treated without paying special attention to the limit of the local coordinate system. Two numerical examples including a simplified model of a leaf spring structure used in nuclear power plants are given.

Semi-analytical sensitivity analysis procedure for frictional contact problems

100%

Chen X. , Hisaida T. , Nakamura K. , Mori M.

Computer Assisted Mechanics and Engineering Sciences

2000

tom Vol. 7, No. 1

69-80

Although there is a need for sensitivity analysis for frictional contact problems in many engineering fields, research work on it has rarely been reported due to the complexity of the problems. In this paper, a sensitivity analysis procedure based on a semi-analytical method for frictional contact problems is presented. The unbalance force due to the variation of design parameters is evaluated numerically, thus the related routine of an existing FEM code can be utilized regardless of the friction law employed. The continuum-mechanics-based formulation is carried out first and then a discretized form is derived. The stick state is modeled by introducing a penalty-type constraint. A couple of numerical examples, including a realistic leaf spring structure used in nuclear power plants, are given to demonstrate the effectiveness of the proposed approach.

Effect of substrate temperature on the crystal properties of LiMn2O4 films prepared by RF magnetron sputtering

88%

Isai M. , Nakamura K. , Hosokawa T. , Izumichi T. , Sekikawa S.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

tom Vol. 3, No. 4

65-68

The LiMn2O4 films for Li secondary batteries have been prepared by a RF magnetron sputtering method. The LiMn2O4 powder was used as a target material. The deposition rate, XRD, and surface morphology were investigated as a function of substrate temperature (Tsub). It was found that the deposition rate had a peak at around the of 200 °C. This research was also designed for preventing the target material being oxidized during the reactive sputtering process. A quartz tube was inserted between shutter and target. It seems that the quartz tube is effective to prevent oxidation of target material.

Effects of short-term exposure to heat stress on splanchnic metabolism in sheep

75%

Taniguchi K. , Nakamura K. , Yoneyama T. , Ito T. , Sugino T. , Obitsu T.

Journal of Animal and Feed Sciences. Supplement

2004

tom 13

nr 1

Secretomic analysis of large cell lung cancer cell lines using two-dimensional gel electrophoresis coupled to mass spectrometry

75%

Yousefi Z. , Sarvari J. , Nakamura K. , Kuramitsu Y. , Ghaderi A. , Mojtahedi Z.

Folia Histochemica et Cytobiologica

2012