2022 Fiscal Year Final Research Report

Reconstruction of contact model and design method of contact surface geometry by direct measurement of deformation behavior on metal contact surfaces

Research Project

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Project/Area Number	20H02046
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 18020:Manufacturing and production engineering-related
Research Institution	Kyoto University
Principal Investigator	Kono Daisuke 京都大学, 工学研究科, 准教授 (80576504)
Co-Investigator(Kenkyū-buntansha)	木村正雄大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 教授 (00373746) 磯部浩已長岡技術科学大学, 工学研究科, 教授 (60272861)
Project Period (FY)	2020-04-01 – 2023-03-31
Keywords	接触剛性 / 接触減衰 / X線CT / 光弾性法 / 弾塑性変形 / 滑り
Outline of Final Research Achievements	The deformation of metal-metal contact surfaces was analyzed in three dimensions by combining displacement measurements using micro X-ray CT, stress measurements using the photoelastic method, and simulations of elasto-plastic deformation using the finite element method. The contribution of the deformation of microscopic asperities and the deformation of the stress concentration region to the contact stiffness was clarified. The effects of elasto-plastic deformation and slip on contact damping were clarified. A model for designing contact surfaces was constructed based on the Cutter Mark Cross method, in which contact surfaces are formed by intersecting machining marks. Two methods were proposed to increase the contact stiffness without decreasing the contact stiffness: one is to fill the small gap with damping material, and the other is to vary the ratio of stick-slip by setting a difference in the height of the machining marks.
Free Research Field	機械工学・生産工学・加工学
Academic Significance and Societal Importance of the Research Achievements	従来は現象論的なモデルを用いて推定していた接触剛性と接触減衰を決定論的なモデルで推定できることが明らかになったことは接触面形状の設計において大きな意義を持つ．また，接触面の微小隙間の利用や真実接触面のスティック・スリップの割合を変化させる方法は剛性と減衰性の設計だけでなく，把持部などの滑りが許容されない接触面の設計においても有用であり，これからの発展が期待できる．荷重を負荷した状態のIn-situなX線CT測定と有限要素法を組み合わせて3次元的な変形を詳細に解析する技術は，一般的な機械部品の変形解析に広く応用できる技術であり，可視化の難しい内部の変形解析の発展に寄与できる．