随着全球化进程的深入,国际化高水平科研平台的建设成为提升城市科研竞争力的重要手段。本文旨在通过分析杭州在国际化科研平台建设方面的现状,总结存在的问题,提出进一步加强国际化高水平科研平台建设的路径建议。With the deepening o...随着全球化进程的深入,国际化高水平科研平台的建设成为提升城市科研竞争力的重要手段。本文旨在通过分析杭州在国际化科研平台建设方面的现状,总结存在的问题,提出进一步加强国际化高水平科研平台建设的路径建议。With the deepening of globalization, the construction of high-level international research platforms has become an important means to enhance the scientific research competitiveness of cities. This paper aims to analyze the current status of Hangzhou’s efforts in building such platforms, summarize the existing problems, and propose pathways to further strengthen the construction of high-level international research platforms.展开更多
Accurately and efficiently predicting the load sharing of multi^bolt thick laminate joints is necessary to quicken the optimization of the large-scale structures over various design variables, and a two-dimensional ...Accurately and efficiently predicting the load sharing of multi^bolt thick laminate joints is necessary to quicken the optimization of the large-scale structures over various design variables, and a two-dimensional （2D） finite element method （FEM） is introduced to meet such a demand. The deformation contributions of the joint zone are analyzed and calculated separately, including the shearing deformation of the fasteners shank, the bending deformation of the fasteners shank, and the bearing deformation of the fasteners and joint plates. These deformations are all transferred and incorporated into the components of the fastener＇s flexibility. In the 2D finite element model, the flexibilities of the beam elements and bush elements are used to simulate different components of the fastener＇s flexibility. The parameters of the beam elements which include the bending moment of inertia and intersection area, and the parameters of the bush elements which include the stiffness in different directions, are all obtained through equalizing the fasteners flexibilities. In addition, the secondary bending effect introduced by the single-lap joints is also taken into account to verify the flexibilities of the fasteners in practical application. The proposed FEM is testified to be more accurate than the traditional 2D FEMs and more efficient than the three-dimensional （3D） FEM in solving load sharing problem of multi-bolt single-lap thick laminate joints. With the increase of joint plates＇ thickness, the advantages of the proposed method tend to be more obvious. The proposed 2D FEM is an effective tool for designing bolted joints in large-scale composite structures.展开更多
文摘随着全球化进程的深入,国际化高水平科研平台的建设成为提升城市科研竞争力的重要手段。本文旨在通过分析杭州在国际化科研平台建设方面的现状,总结存在的问题,提出进一步加强国际化高水平科研平台建设的路径建议。With the deepening of globalization, the construction of high-level international research platforms has become an important means to enhance the scientific research competitiveness of cities. This paper aims to analyze the current status of Hangzhou’s efforts in building such platforms, summarize the existing problems, and propose pathways to further strengthen the construction of high-level international research platforms.
文摘Accurately and efficiently predicting the load sharing of multi^bolt thick laminate joints is necessary to quicken the optimization of the large-scale structures over various design variables, and a two-dimensional （2D） finite element method （FEM） is introduced to meet such a demand. The deformation contributions of the joint zone are analyzed and calculated separately, including the shearing deformation of the fasteners shank, the bending deformation of the fasteners shank, and the bearing deformation of the fasteners and joint plates. These deformations are all transferred and incorporated into the components of the fastener＇s flexibility. In the 2D finite element model, the flexibilities of the beam elements and bush elements are used to simulate different components of the fastener＇s flexibility. The parameters of the beam elements which include the bending moment of inertia and intersection area, and the parameters of the bush elements which include the stiffness in different directions, are all obtained through equalizing the fasteners flexibilities. In addition, the secondary bending effect introduced by the single-lap joints is also taken into account to verify the flexibilities of the fasteners in practical application. The proposed FEM is testified to be more accurate than the traditional 2D FEMs and more efficient than the three-dimensional （3D） FEM in solving load sharing problem of multi-bolt single-lap thick laminate joints. With the increase of joint plates＇ thickness, the advantages of the proposed method tend to be more obvious. The proposed 2D FEM is an effective tool for designing bolted joints in large-scale composite structures.
