成果報告書詳細
管理番号20160000000732
タイトル*平成27年度中間年報 次世代構造部材創製・加工技術開発事業の周辺技術・関連課題における小規模研究開発の実施 補強繊維の長所を活かしたCFRPラティス構造の研究開発
公開日2016/9/22
報告書年度2015 - 2015
委託先名国立大学法人東京大学
プロジェクト番号P15006
部署名材料・ナノテクノロジー部
和文要約
英文要約Title: Development of Technologies for Next-Generation Structure Component Creation and Processing. Feasibility Study on CFRP Lattice Structures with Efficient Use of Reinforced Fibers (FY2015-FY2016) FY2015 Annual Report

CFRP lattice structure, consisting of helical and hoop ribs intersecting each other in a regular pattern, is considered to be a superior candidate as the lightweight aerospace structure. When considering the failure mechanisms of CFRP lattice cylinders under compressive loads, the helical ribs may also cause in-plane deformation of the rib. Unfortunately, this local in-plane distorsions distributed in lattice shells lead to the degradation in compressive loading capacity. In order to prevent this local rotational effect, the present study proposes the addition of thin skin to the CFRP lattice cylinders. Finite element analysis indicates that the skin effectively eliminates this local rotational effect of the ribs and the buckling loads of skin added lattice cylinders significantly increase. The analysis on the skin added CFRP lattice structures provokes the inference that added skin plays a role of hoop ribs. Thus, a new lattice concept without hoop ribs is investigated in the present study. This new concept, consisting of helical ribs and unidirectional skin aligned in hoop direction, is named “X-lattice” from its arrangement of helical ribs. The buckling loads are compared between skin added traditional lattice cylinder and X-lattice in order to confirm the validity of this new concept. In this comparison, helical ribs of X-lattice are made thicker not to change the structural weight from the original skin added cylinder. It is found that X-lattice shows more efficient compressive resistance than the skin added lattice cylinder under the same weight condition. Thus, the circumferentially wound skin can be considered to be a reasonable system for repressing the out-of-plane deformation of helical rib. It is noted that X-lattice structures has no hoop ribs, which results in easy manufacturing process when lattice structures are fabricated. In the present study, a new manufacturing process of X-lattice panels is investigated, and the final goal is to demonstrate the manufacturability and validate the design methodology of X-lattice structure which is considered to be a superior candidate for extremely light-weight structural members. Details of X-lattice panels (e.g. dimensions) are defined based on numerical analyses, and manufacturing device is under design.
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