論文 - 高野　直樹

Macro-micro uncoupled analysis procedure for nonlinear structural mechanics of composites - RVE approach to microstructural geometrically nonlinear problem

Takano N., Zako M., Ohnishi Y.

Zairyo/Journal of the Society of Materials Science, Japan （Zairyo/Journal of the Society of Materials Science, Japan）  45 （ 2 ） 163 - 168 1996年02月

ISSN  05145163

　概要を見る

The purpose of this study is to develop a practical analysis procedure for nonlinear structural mechanics of composites. Especially, to solve such a nonlinear mechanical problem arising from the microstructural nonlinear behavior, the new homogenization procedure named macro-micro uncoupled method is proposed. First, the homogenized macroscopic material properties are calculated by precise microscopic nonlinear analysis. Then, macroscopic analysis can be performed easily by only referring to the pre-calculated nonlinear material properties. In this paper, RVE approach is taken for the microscopic nonlinear analysis, and the proposed macro-micro uncoupled method is applied to a microstructural large deformation problem of porous media.

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複合材料用三次元構造解析支援システムの構築

高野 直樹

日本機械学会論文集A編 62 （ 598 ） 1501-1505 1996年

研究論文（学術雑誌）, 共著, 査読有り

繊維強化複合材料の剛性設計のためのGAの効率的適用

高野 直樹

材料 45 （ 12 ） 1316-1321 1996年

研究論文（学術雑誌）, 共著, 査読有り

ワインディング構造物の仮想試作システム構築（第１報，テープワインディングならびにその強度）

高野 直樹

日本機械学会論文集A編 62 （ 598 ） 1450-1455 1996年

研究論文（学術雑誌）, 共著, 査読有り

複合材料の非線形構造力学解析のためのマクロ－マイクロ非連成化手法 －マイクロ構造における幾何学的非線形問題へのRVEアプローチ－

高野 直樹

材料 45 （ 2 ） 163-168 1996年

研究論文（学術雑誌）, 共著, 査読有り

複合材料のマイクロ構造における幾何学的非線形性と破壊を考慮した均質化解析手法

高野 直樹

日本機械学会論文集A編 62 （ 595 ） 859-864 1996年

研究論文（学術雑誌）, 共著, 査読有り

均質化法による織物複合材料の三次元マイクロ構造設計（第２報，曲げ負荷時のマイクロスコピックな挙動の詳細解析

高野 直樹

日本機械学会論文集A編 62 （ 595 ） 884-889 1996年

研究論文（学術雑誌）, 共著, 査読有り

Macro-Micro Uncoupled Homogenization Procedure for Microscopic Nonlinear Behavior Analysis of Composites

高野 直樹

Materials Science Research International （Materials Science Research International）  2 （ 2 ） 81-86 - 86 1996年

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り,  ISSN  13411683

　概要を見る

For easy and practical simulation of microscopic nonlinear mechanical behavior of composite materials, new homogenization analysis procedure named macro-micro uncoupled method is proposed. In this procedure, microscopic simulation of material strength test is carried out first, then nonlinear homogenized material properties are obtained. Both the homogenization method and RVE (Representative Volume Element) approach are shown for this microscopic simulation. Macroscopic nonlinear behavior of a structure made of composite materials can be analyzed by only referring the pre-calculated homogenized material nonlinearity. As an example, microscopic fracture propagation for textile composite materials and microscopic large deformation for porous elastic materials are analyzed.

Numerical Prediction of Strength of UD Notched Laminates by Analyzing the Propagation of Intra- and Inter-laminar Damage

高野 直樹

Materials Science Research International 2 （ 2 ） 117-122 1996年

研究論文（学術雑誌）, 共著, 査読有り

Three-dimensional microstructural design of woven fabric composite material by homogenization method

Takano N., Zako M.

American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP （American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP）  302   141 - 146 1995年12月

ISSN  0277027X

　概要を見る

The strength of woven fabric composite materials depends on the microstructural geometry. However, the conventional methods for mechanical analysis, which have been widely used so far, are insufficient because they cannot take into account for the three-dimensional microstructure. In this study, three-dimensional homogenization method is shown to be effective for the evaluations of the material constants, microscopic stresses and the strength. It has been found that the transverse stresses in the direction of lamination play an important role for the fracture of both fiber bundle and resin. Also, the effect of the mismatched lay-up on the strength has been investigated. It has well been predicted that the mismatched lay-up causes the reduction of the strength and the difference of crack initiation in the resin. These simulations give us a new concept of the microstructural design of the composite materials.

微視破壊を考慮した均質化法による織物複合材料の非線形解析

高野 直樹

材料 44 （ 505 ） 1231-1237 1995年

研究論文（学術雑誌）, 共著, 査読有り

Fixed Grid に基づく均質化法による複合材料のマイクロスコピック・シミュレーション技法の提案

高野 直樹

日本機械学会論文集A編 61 （ 583 ） 589-594 1995年

研究論文（学術雑誌）, 共著, 査読有り

均質化法による織物複合材料の三次元マイクロ構造設計（第１報，強度に及ぼす織物積層方向位置ずれの影響）

高野 直樹

日本機械学会論文集A編 61 （ 585 ） 1038-1043 1995年

研究論文（学術雑誌）, 共著, 査読有り

Stress analysis of sandwich plate by the homogenization method

高野 直樹

Journal of the Society of Materials Science, Japan （Journal of the Society of Materials Science, Japan）  1 （ 2 ） 82-88 - 88 1995年

研究論文（学術雑誌）, 単著, 査読有り,  ISSN  05145163

　概要を見る

The effectiveness of the homogenization method for analysis of composite materials has been shown since it was firstly introduced in 1970's. As this method is applicable to periodic problems only, however, some engineering problems remain unsolved. For instance, we could not apply it to honey-comb sandwich plates and panels with reinforcing ribs because these structures are not periodic in the thickness direction. In this paper, the application of the homogenization method to those composite structures is discussed. As a practical example, stress analysis of single-layered corrugated core sandwich plate is presented. A method to homogenize the complicated geometry to a simple solid model, to get the homogenized material constants, and to calculate the microscopic stress is proposed. © 1995, The Society of Materials Science, Japan. All rights reserved.

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均質化法による単層波状コアサンドイッチ板の解析－面内のみ周期性を有する複合構造への均質化法の適用について－

高野 直樹

材料 44 （ 502 ） 905-910 1995年

研究論文（学術雑誌）, 共著, 査読有り

損傷力学に基づく複合材料用三次元有限要素法の開発

高野 直樹

材料 44 （ 502 ） 921-926 1995年

研究論文（学術雑誌）, 共著, 査読有り

信頼性に基づく先端材料用設計寿命評価システム

高野 直樹

日本機械学会論文集A編 61 （ 589 ） 1909-1913 1995年

研究論文（学術雑誌）, 共著, 査読有り

Analysis of Single-Layered Corrugated Core Sandwich Plate by Homogenization Method — On the Application of Homogenization Method to Composite Structures with Only Planar Periodicity —

Takano N., Zako M.

Journal of the Society of Materials Science, Japan （Journal of the Society of Materials Science, Japan）  44 （ 502 ） 905 - 910 1995年

ISSN  05145163

　概要を見る

The effectiveness of the homogenization method for the analysis of composite materials has been shown since it was firstly introduced in the 1970's. As this method is applicable to periodic problems only, however, some important engineering problems remain unsolved. Those problems are, for instance, honey-comb sandwich plates and panels with reinforcing ribs, which are not periodic in the thickness direction. In this paper, the application of the homogenization method to those problems is discussed. As a pratical example, stress analysis of single-layered corrugated core sandwich plates is presented. A method to homogenize its complicated geometry to a simple solid model, to get the homogenized material constants, and to calculate the microscopic stress is proposed. © 1995, The Society of Materials Science, Japan. All rights reserved.

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Three Dimensional Microstructural Design of Woven Fabric Composite Materials by the Homogenization Method (1st Report, Effect of Mismatched LayUp of Woven Fabrics on the Strength)

Takano N., Zako M., Sakata S.

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A （Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A）  61 （ 585 ） 1038 - 1043 1995年

ISSN  03875008

　概要を見る

The strength of woven fabric composite materials depends on their microstructural geometry. However, the conventional methods for mechanical analysis, which have been widely used to date, are insufficient because they cannot take into account the three-dimensional microstructure. In this study, the three-dimensional homogenization method is shown to be effective for determination of the material constants, microscopic stresses and strength. It has been found that the transverse stress in the lamination direction plays an important role in the fracture of both the fiber bundle and the resin. Also, the effect of the mismatched lay-up on the strength has been investigated. It was predicted that the mismatched lay-up causes a reduction in strength and a difference of crack initiation in the resin. These simulations provide a new concept for the microstructural design of composite materials. © 1995, The Japan Society of Mechanical Engineers. All rights reserved.

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Nonlinear Analysis of Woven Fabric Composite Materials by Homogenization Method Considering Microscopic Fracture

Takano N., Zako M.

Journal of the Society of Materials Science, Japan （Journal of the Society of Materials Science, Japan）  44 （ 505 ） 1231 - 1237 1995年

ISSN  05145163

　概要を見る

Textile composites are becoming more and more important in engineering field. Need for computational simulations of their mechanical behaviors is also growing. In this study, a nonlinear homogenization method has been developed for the analysis of fracture behaviors of woven fabric composite materials. First, the mechanical behaviors of flat plates made from woven fabric composite materials were analyzed under various loading conditions, and then the reduction of modulus of elasticity by microscopic fracture was calculated precisely. Next, the nonlinear fracture analysis of a plate with an open hole was carried out. It is revealed that the knee points and notched strength are able to be predicted. © 1995, The Society of Materials Science, Japan. All rights reserved.

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