检索结果-南通市图书馆

Micromechanical modeling of longitudinal tensile behavior and failure mechanism of unidirectional carbon fiber/aluminum composites involving fiber strength dispersion

引用

Chinese Journal of Aeronautics 2024年第9期37卷 312-327页

作者： Qipeng LIU Wengang JIANG Yuehua GAO Zhenjun wang Shanshan SHI Zhi SUN Jiangxi key laboratory of Forming and Joining technology for Aerospace Components Nanchang Hangkong UniversityNanchang 330063China School of Locomotive and Rolling Stock Engineering Dalian Jiaotong UniversityDalian 116028China state key laboratory of structural analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China

This paper examines the longitudinal tensile behavior and failure mechanism of a new unidirectional carbon fiber reinforced aluminum composite through experiments and simulations.A Weibull distribution model was established to describe the fiber strength dispersion based on single-fiber tensile tests for carbon fibers extracted from the *** constitutive models for the matrix and interface were established based on the uniaxial tensile and single-fiber push-out tests,***,a 3D micromechanical numerical model,innovatively considering the fiber strength dispersion by use of the weakest link and Weibull distribution theories,was estab-lished to simulate the progressive failure behavior of the composite under longitudinal *** to the dispersion of fiber strength,the weakest link of the fiber first fractures,and stress concentra-tion occurs in the surrounding fibers,interfaces,and *** maximum stress concentration fac-tor for neighboring fibers varies nonlinearly with the distance from the fractured *** isolated and clustered fractured fibers are present during the progressive failure process of the *** expansion of fractured fiber clusters intensifies stress concentration and material degradation which in turn enlarges the fractured fiber clusters,and their mutual action leads to the final collapse of the composite.

关键词： Fiber reinforced metals Finite element method 3D micromechanical model Fiber strength dispersion Longitudinal tension Progressive failure

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于离散变量的多材料结构拓扑优化设计

引用

计算力学学报 2024年第4期41卷 611-617页

作者：刘宏亮王成梁缘沈阳航空航天大学辽宁省飞行器复合材料结构分析与仿真重点实验室沈阳110136 大连理工大学工业装备结构分析优化与CAE软件全国重点实验室大连116024

多材料结构拓扑优化相比于单材料结构优化具有更大的设计空间,展现出巨大的设计潜力和应用前景。本文基于离散设计变量研究多材料结构拓扑优化,通过建立有效的设计优化方法,获得轻质高效的结构设计。首先,根据离散变量的特点,建立多材... 详细信息

多材料结构拓扑优化相比于单材料结构优化具有更大的设计空间,展现出巨大的设计潜力和应用前景。本文基于离散设计变量研究多材料结构拓扑优化,通过建立有效的设计优化方法,获得轻质高效的结构设计。首先,根据离散变量的特点,建立多材料结构拓扑优化模型,由离散变量下约束函数和目标函数的灵敏度信息构造序列近似整数规划子问题,采用运动极限策略限制设计变量的改变量以保证整数规划子问题的近似精度。为了解决离散变量的组合复杂性,采用具有多项式复杂度的正则松弛算法来高效求解(和经典的连续变量算法效率相当)。本文利用多材料结构最小柔顺性优化问题以及最大传热效率优化问题研究离散变量方法的有效性。数值算例表明,离散变量优化方法可以获得稳定迭代收敛的多材料拓扑设计,优化构型中的材料界面清晰分明,有效避免了出现模糊区域。

关键词：拓扑优化离散设计变量整数规划多材料结构

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Precontrol of short-period motion for a Tension Leg Platform

引用

Journal of Ocean Engineering and Science 2024年第3期9卷 264-277页

作者： Hao wu Yan Lin Yongxi wu School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China Department of Naval Architecture Dalian University of TechnologyDalian 116023China state key laboratory of structural analysis for industrial equipment Dalian University of TechnologyDalian 116023China School of Mechanics and Engineering Science Shanghai UniversityShanghai 200444China

The Tension Leg Platform(TLP)is a hybrid,compliant platform designed to sustain springing and ringing responses that are correlated to short-period *** the period of short-period motion is within the wave energy concentration region,TLPs may experience sensitive short-period motion,such as resonance and green water,that usually cause serious damage to *** this study,a precontrol methodology is presented as a solution to prevent TLP-sensitive short-period *** applying the precontrol methodology,the parameters of TLP can be predetermined,allowing TLP motion performance to meet the requirements of short-period motion before sensitive motions actually *** example,the damping coefficient should be less than 4.3,the tendons’stiffness should be larger than 0.91×10^(8),and the dimensionless draft should be less than *** development of a precontrol methodology is based on a solid theoretical ***,a series of simple and high-fidelity numerical models are proposed to simulate the natural period of roll,natural period of heave,and green water ***,a constraint regime is generated based on the numerical models and the sensitive motion range of short-period *** constraint regime is divided into two parts:the control range(corresponding to sensitive shortperiod motion)and the feasible range(the complementary set of control ranges in the whole parameter constraint domain).Finally,TLP parameters are derived from the calculated feasible *** precontrol methodology goes beyond the conventional approach of real-time control by changing the control from a remedial action to a preventive action.

关键词： Precontrol Constraint regime Short-period motion TLP

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

极地海冰动力过程的多面体离散元方法

引用

计算力学学报 2024年第4期41卷 651-658页

作者：李继王嗣强王安良季顺迎大连理工大学工业装备结构分析优化与CAE软件全国重点实验室大连116024 国家海洋环境预报中心北京100081

极地海冰影响局部海域的通航条件乃至地质尺度上的气候预测,由于基于连续介质理论的海冰数值模式如网格方法难以应对浮冰尺度的模拟,近年来离散元方法越来越多用于海冰动力学领域。本文使用基于表面网格划分的多面体描述浮冰,通过使用GJ... 详细信息

极地海冰影响局部海域的通航条件乃至地质尺度上的气候预测,由于基于连续介质理论的海冰数值模式如网格方法难以应对浮冰尺度的模拟,近年来离散元方法越来越多用于海冰动力学领域。本文使用基于表面网格划分的多面体描述浮冰,通过使用GJK(Gilbert-Johnson-Keerthi)算法以进行初步接触判断并提高计算效率,采用基于能量守恒接触理论确定单元间接触力,由此建立了极地海冰多面体离散元方法。将该方法应用于极地海冰动力过程模拟,并考虑Hopkins提出的冰脊形成导致的海冰间塑性接触力。首先通过两个浮冰间碰撞模拟以验证接触力计算的正确性,再通过对单向均匀风场下浮冰挤压的模拟验证冰脊生成的模拟能力,最后研究冻结强度参数对剪切风场下冰盖断裂和冰脊生成的影响。结果表明,极地海冰多面体离散元方法能够合理地反映地质尺度海冰的动力过程,并且可有效地模拟冰盖线性运动引起的冰隙和冰脊等动力特征。

关键词：海冰动力学离散元方法冰脊模型海冰断裂

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

*** Song won the Fellow Awards of the International Association for Computational Mechanics

引用

Science china(Physics,Mechanics & Astronomy) 2012年第12期55卷 2492-2494页

作者： wu chuijie state key laboratory of structural analysis for industrial equipment&School of Aeronautics and Astronautics Dalian University of TechnologyDalian 116024China

Professor Song Fu won the International Association for Computational Mechanics（IACM） Fellow Awards in praise for his outstanding contributions in the field of the turbulence simulation in a special Award Session at... 详细信息

关键词：计算力学研究员协会国际

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical investigation of dynamical behavior of tethered rigid spheres in supersonic flow

引用

Applied Mathematics and Mechanics(English Edition) 2016年第6期37卷 749-760页

作者： Tao LI Jingxia SUI chuijie wu state key laboratory of structural analysis of industrial equipment Dalian University of Technology School of Energy and Power Engineering Dalian University of Technology

The dynamical behavior of two tethered rigid spheres in a supersonic flow is numerically investigated. The tethered lengths and radius ratios of the two spheres are different. The two spheres, which are centroid axially aligned initially, are held stationary first, then released, and subsequently let fly freely in a supersonic flow. The mean qualities of the system and the qualities of the bigger sphere are considered and compared with the situations without the tether. In the separation process, six types of motion caused by the spheres, tether, and fluid interaction are found. The results show that the mean x-velocity of the system changes in a different manner for different radius ratios, and the x-velocity of the bigger sphere is uniformly reduced but through different mechanisms.

关键词： dynamical behavior supersonic flow tethered sphere

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research on the optimal dynamical systems of three-dimensional Navier-Stokes equations based on weighted residual

引用

Science china(Physics,Mechanics & Astronomy) 2016年第4期59卷 78-85页

作者： NaiFu Peng Hui Guan chuijie wu state key laboratory of structural analysis for industrial equipment School of Aeronautics and AstronauticsDalian University of Technology state key laboratory for Turbulence and Complex Systems Center for Applied Physics and TechnologyCollege of Engineering Peking University College of Meteorology and Oceanography PLA University of Science and Technology

In this paper, the theory of constructing optimal dynamical systems based on weighted residual presented by wu & Sha is applied to three-dimensional Navier-Stokes equations, and the optimal dynamical system modeling equations are derived. Then the multiscale global optimization method based on coarse graining analysis is presented, by which a set of approximate global optimal bases is directly obtained from Navier-Stokes equations and the construction of optimal dynamical systems is realized. The optimal bases show good properties, such as showing the physical properties of complex flows and the turbulent vortex structures, being intrinsic to real physical problem and dynamical systems, and having scaling symmetry in mathematics, etc.. In conclusion, using fewer terms of optimal bases will approach the exact solutions of Navier-Stokes equations, and the dynamical systems based on them show the most optimal behavior.

关键词： optimal dynamical systems weighted residual three-dimensional Navier-Stokes equations vortex structures

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of wall motion on particle sedimentation using hybrid LB-IBM scheme

引用

Science china(Physics,Mechanics & Astronomy) 2017年第3期60卷 55-73页

作者： Mussie A. Habte chuijie wu School of Aeronautics and Astronautics Dalian University of Technology Dalian 116024 China state key laboratory of structural analysis for industrial equipment Dalian 116024 China

We integrate the lattice Boltzmann method(LBM) and immersed boundary method(IBM) to capture the coupling between a rigid boundary surface and the hydrodynamic response of an enclosed particle laden fluid. We focus on a rigid box filled with a Newtonian fluid where the drag force based on the slip velocity at the wall and settling particles induces the interaction. We impose an external harmonic oscillation on the system boundary and found interesting results in the sedimentation behavior. Our results reveal that the sedimentation and particle locations are sensitive to the boundary walls oscillation amplitude and the subsequent changes on the enclosed flow field. Two different particle distribution analyses were performed and showed the presence of an agglomerate structure of particles. Despite the increase in the amplitude of wall motion, the turbulence level of the flow field and distribution of particles are found to be less in quantity compared to the stationary walls. The integrated LBM-IBM methodology promised the prospect of an efficient and accurate dynamic coupling between a non-compliant bounding surface and flow field in a wide-range of systems. Understanding the dynamics of the fluid-filled box can be particularly important in a simulation of particle deposition within biological systems and other engineering applications.

关键词： particle collisions lattice Boltzmann method immersed boundary method hard sphere molecular dynamics harmoni coscillation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Shape optimization of the caudal fin of the three-dimensional self-propelled swimming fish

引用

Science china(Physics,Mechanics & Astronomy) 2013年第2期56卷 328-339页

作者： XIN ZhiQiang wu chuijie College of Mechanics and Materials Hohai University state key laboratory of structural analysis for industrial equipment & School of Aeronautics and Astronautics Dalian University of Technology

Shape optimization of the caudal fin of the three-dimensional self-propelled swimming fish,to increase the swimming efficiency and the swimming speed and control the motion direction more easily,is investigated by combining optimization algorithms,unsteady computational fluid dynamics and dynamic control in this *** 3D computational fluid dynamics package contains the immersed boundary method,volume of fluid method,the adaptive multi-grid finite volume method and the control strategy of fish *** shape optimizations of various swimming speeds,the results show that the optimal caudal fins of different swimming modes are not exactly the same ***,the optimal fish of high swimming speed,whose caudal fin shape is similar to the crescent,also have higher efficiency and better maneuverability than the other optimal bionic fish at low and moderate swimming ***,the mechanisms of vorticity creation of different optimal bionic fish are studied by using boundary vorticity-flux theory,and three-dimensional wake structures of self-propelled swimming of these fish are comparatively *** study of vortex dynamics reveals the nature of efficient swimming of the 3D bionic fish with the lunate caudal fin.

关键词： 3D bionic fish caudal fin shape optimization swimming performance vortex dynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A study of a three-dimensional self-propelled flying bird with flapping wings

引用

Science china(Physics,Mechanics & Astronomy) 2015年第9期58卷 52-67页

作者： ZHU LinLin GUAN Hui wu chuijie state key laboratory of structural analysis for industrial equipment School of Aeronautics and Astronautics Dalian University of Technology College of Meteorology and Oceanography PLA University of Science and Technology

In this paper, a study of a three-dimensional(3D) self-propelled bionic flying bird in a viscous flow is carried out. This bionic bird is propelled and lifted through flapping and rotating wings, and better flying can be achieved by adjusting the flapping and rotation motion of wings. In this study, we found that the bird can fly faster forward and upward with appropriate center of rotation and oscillation without more energy consumption and have perfect flight performance at a certain angle of attack by adjusting the center of oscillation. The study utilizes a 3D computational fluid dynamics package which constitutes combined immersed boundary method and the volume of fluid method. In addition, it includes adaptive multigrid finite volume method and control strategy of swimming and flying.

关键词： self-propelled bird flying numerical simulation three-dimensional

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：