METHOD OF CREATING PLANE EXPANSION DATA SUITABLE FOR PREFORM OF THREE-DIMENSIONAL FIBER REINFORCED COMPOSITE MATERIAL SHELL STRUCTURE, PROGRAM FOR CREATING PLANE EXPANSION DATA, AND METHOD OF PRODUCING PREFORM FOR THREE-DIMENSIONAL FIBER REINFORCED COMPOSITE MATERIAL SHELL STRUCTURE

To reduce a degree of strength reduction of a three-dimensional fiber-reinforced composite material shell structure due to a cut line to be set in a preform.SOLUTION: There is provided a method of creating a plane expansion data suitable of a preform for a three-dimensional fiber-reinforced composite material shell structure, the method comprises: mapping to a corresponding point in which a first model changes to a second model that is a two-dimensional finite element model by applying a forced displacement function to the first model that is a three-dimensional finite element model representing a curved surface; determining a distribution of a parameter corresponding to a strain energy brought by the forced displacement function in the second model; creating a third model that is the two-dimensional finite element model with a cut line that separates a part of nodes in which a value of the above parameters are large in the nodes on a boundary in the second model; and using the third model as a fourth model to which an arrangement information of continuous fibers can be added, and the arrangement information of the continuous fibers is added to the fourth model to obtain a plane expansion data.SELECTED DRAWING: Figure 2 【課題】プリフォームに設定されるカットラインによる３次元繊維強化複合材料シェル構造物の強度低下の度合いを減らす。【解決手段】曲面を表す３次元有限要素モデルである第１のモデルに強制変位函数を適用して、第１のモデルを２次元有限要素モデルである第２のモデルにする、対応する点への写像を行う。また、第２のモデルにおける、強制変位函数によってもたらされたひずみエネルギーに対応するパラメーターの分布を求める。また、第２のモデルにおける境界上の節点のうち、上記パラメーターが大となる部分の節点を分離するカットラインが入れられた２次元有限要素モデルである第３のモデルを作成する。また、第３のモデルを連続繊維の配置情報が付加可能な第４のモデルとし、この第４のモデルに連続繊維の配置情報を付加して平面展開データとする。【選択図】図２