931 resultados para "border"
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目录
一 导论
1 绪言
2 激光加工概论
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二 激光加工原理
1 激光原理
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三 激光柔性加工工程
1 几种常用的工业激光器
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四 激光加工机器人系统
1 五维框架式工业机器人工作原理
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五 智能测量工程
1 智能测量
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六 智能控制系统的集成
1 智能控制的集成
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七 实时在线监控
1 实时在线监控的重要性
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参考文献
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《边界层理论讲义》是郭永怀先生为中国科学技术大学近代力学系第一届学生讲授边界层理论所著的，经徐书轩和尹协远教授精心校订后，即将在庆祝中国科学技术大学成立50周年和纪念郭永怀先生牺牲40周年之际付印出版了。这是一件十分值得庆贺的事。郭永怀先生是我国著名的力学和应用数学家，在流体力学和边界层理论方面有极深的造诣和重要的贡献。他又是一位热心的教育家。他和钱学森先生共同创建了中国科学技术大学近代力学系，积极倡导要在加强基础科学教育的同时把同学们带到学科的前沿。《边界层理论讲义》十分鲜明地体现了这种精神，在回顾流体力学基本方程和详细讲述低速边界层基本理论之后，紧接着便讲授低速湍流边界层和高速层流与湍流边界层理论，把同学们直接带进高速飞行面临的前沿科学领域。
“讲义”还体现了郭永怀先生一贯的严谨和精炼的作风和求实的科学精神。在短短的一百多页中，郭先生严密地论证和推导了边界层方程，讲述了湍流的基本特点及其在边界层方程式中的体现，介绍了基本的解法和典型解以及近似解法，指出了它们的适用范围。就其涉及内容的广度和深度而言，“讲义"已经超出教材的范围而成为一本学习和随时参考的专著了。“讲义”虽然著于四十余年前，但即使在计算技术高度发展的今天，仍不失其作为重要著作的价值。
“讲义”是郭先生留给我们的一份重要遗产，相信将受到广大读者的欢迎并进入我国科学家著作的宝库。
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本书共有16篇论文,论述了国内外有关复合材料及其结构力学等方面新近进展的情况。如：复合材料及其结构的粘弹性力学、三相模型下复合材料的细观力学性质等。
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目录
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This book elucidates the methods of molecular gas dynamics or rarefied gas dynamics which treat the problems of gas flows when the discrete molecular effects of the gas prevail under the circumstances of low density, the emphases being stressed on the basis of the methods, the direct simulation Monte Carlo method applied to the simulation of non-equilibrium effects and the frontier subjects related to low speed microscale rarefied gas flows. It provides a solid basis for the study of molecular gas dynamics for senior students and graduates in the aerospace and mechanical engineering departments of universities and colleges. It gives a general acquaintance of modern developments of rarefied gas dynamics in various regimes and leads to the frontier topics of non-equilibrium rarefied gas dynamics and low speed microscale gas dynamics. It will be also of benefit to the scientific and technical researchers engaged in aerospace high altitude aerodynamic force and heating design and in the research on gas flow in MEMS
| [1] Molecular structure and energy states | (21) | ||
| [2] Some basic concepts of kinetic theory | (51) | ||
| [3] Interaction of molecules with solid surface | (131) | ||
| [4] Free molecular flow | (159) | ||
| [5] Continuum models | (191) | ||
| [6] Transitional regime | (231) | ||
| [7] Direct simulation Monte-Carlo (DSMC) method | (275) | ||
| [8] Microscale slow gas flows, information preservation method | (317) | ||
| [App. I] Gas properties | (367) | ||
| [App. II] Some integrals | (369) | ||
| [App. III] Sampling from a prescribed distribution | (375) | ||
| [App. IV] Program of the couette flow | (383) | ||
| Subject Index | (399) | ||
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目录
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本书阐明了板壳断裂理论的基础。论证了Reissner型板壳断裂理论的科学性、经典板壳断裂理论的缺陷及在一定范围内仍具有的实用价值；介绍了作者所创意的研究Reissner型板壳断裂纹尖端场的方法等。
目录
- §1．1 板壳弯曲断裂问题
- §1．2 Kirchhoff经典板壳弯曲断裂理论
- §1．3 Reissner型板壳弯曲断裂理论
- §1．4 Kirchhoff与Reissner型板壳弯曲断裂理论的比较
- §1．5 含裂纹有限尺寸板壳断裂分析的局部-整体法
- §1．6 含表面裂纹板壳
- §2．1 Kirchhoff板的基本概念和基本假定
- §2．2 基本公式与弹性曲面微分方程
- §2．3 边界条件
- §2．4 弹性薄板的应变能
- §2．5 极坐标下的挠曲面微分方程与内力公式
- §2．6 裂纹尖端场特征展开式通项公式
- §2．7 Kirchhoff板弯曲应力强度因子
- §3．1 基本方程和公式的复变函数表示
- §3．2 所引入函数的确定程度与一般形式
- §3．3 坐标变换与边界条件
- §3．4 运用保角变换方法求解孔口问题
- §3．5 应力强度因子与函数Φ(z)的关系
- §3．6 复变-主部分析法之应用简例
- §3．7 共直线裂纹问题的一般解答
- §3．8 典型弯曲裂纹问题的解答及弯曲应力强度因子公式
- §3．9 共圆曲线裂纹问题的解答及弯曲应力强度因子公式
- §4．1 裂纹尖端奇异元的位移模式与弯曲应力强度因子
- §4．2 裂纹尖端奇异元的刚度矩阵
- §4．3 裂纹尖端奇异元与常规单元的连接
- §4．4 解析法与数值法的结果比较与讨论
- §4．5 两共线半无限裂纹问题的定解条件及解的实用价值
- §5．1 Reissner型板的基本假定
- §5．2 Reissner型板的基本公式与平衡微分方程
- §5．3 基本方程的简化
- §5．4 边界条件
- §5．5 极坐标下的基本公式与平衡微分方程
- §5．6 两种平板理论用于无裂纹板时的比较
- §5．7 两种乎板理论用于含裂纹板时的比较
- §6．1 基本方程和一般求解方法
- §9．1 局部-整体法与其它解析和数值法的结果比较
- §9．2 边界对应力强度因子的影响
- §9．3 板的支承条件及长宽比的影响
- §9．5 计算Reissner型板应力强度因子的一组近似方程与近似解法
- §9．4 Reissner型板理论与Kirchhoff板理论所得应力强度因子的比较
- §9．6 关于数值计算的几点讨论
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用于大气环流模式的陆面物理过程参数化研究进展 戴永久，曾庆存，欧阳兵
在植物耗水条件下土壤水分动态的数值模拟 姚德良，邱克俭，冀伟，孙菽芬
Modelling of terrestrial ecosystem B.Ouyang
森林生态系统生物循环过程的耦合模型（BCM）及其数值模拟 欧阳兵
Turbulence in the atmosphere and ocean J.C.Li
Sensitivity of IAP two-level AGCM to surface albedo variations Z.H.Lin,Q.C.Zeng and B.Ouyang
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本书为祝贺郑哲敏先生八十华诞的学术报告会的文集，其中收录邀请报告12篇，定向征文58篇。这些论文涉及爆炸力学、岩土力学、冲击力学、材料力学性能、生物力学、物理力学、海洋工程力学、环境流体力学等几大方面，绝大多数为论文作者科研项目的最新成果。
| 会议论文 |
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序 | 洪友士; | |||||
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内禀Deborah数在破坏现象中的意义 | 白以龙;汪海英; | |||||
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爆炸波在混凝土夹层结构中传播特性分析 | 段祝平; | |||||
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海洋内波与海洋工程 | 李家春;程友良;范平; | |||||
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郑哲敏先生为推动我国力学和技术科学发展所作的贡献 | 谈庆明; | |||||
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开发深海资源的海底空间站技术 | 曾恒一; | |||||
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微系统动力学研究的一些新进展 | 赵亚溥; | |||||
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爆炸近区空气冲击波规则反射和非规则反射 | 周丰峻;陈叶青;任辉启; | |||||
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椭圆函数的精细积分算法 | 钟万勰;姚征; | |||||
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量子蒙特卡罗法的研究 | 孙祉伟; | |||||
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拟Hamilton系统随机平均法在活性布朗粒子动力学研究中的应用 | 朱位秋;邓茂林; | |||||
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二个二阶张量的各向同性标量函数的广义坐标 | 王文标;段祝平; | |||||
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弹性杆轴向碰撞波动问题理论分析 | 马炜;刘才山;黄琳; | |||||
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两个可变形结构的相互碰撞——模型与验证 | 余同希;阮海辉; | |||||
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结构动力计算中自由度减缩方法概述 | 刘彬;丁桦;梁乃刚; | |||||
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弹塑性系统动力行为探讨 | 杨桂通; | |||||
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SINGULARITY THEORY ON BUCKLING OF COMPRESSIBLE ELASTIC SLENDER RODS | 张义同;谢宇新; | |||||
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GCr15钢超高周疲劳断口观察与裂纹起源分析 | 周承恩;洪友士; | |||||
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纳米尺度毛细作用学——纳米物理力学的新领域 | 朱如曾; | |||||
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METALLIC CELLULAR SOLIDS UNDER IMPACT LOADING | H.Zhao;S.Abdennadher;I.Elnasri; |
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Adiabatic shear localization is a mode of failure that occurs in dynamic loading. It is characterized by thermal softening occurring over a very narrow region of a material and is usually a precursor to ductile fracture and catastrophic failure. This reference source is the first detailed study of the mechanics and modes of adiabatic shear localization in solids, and provides a systematic description of a number of aspects of adiabatic shear banding. The inclusion of the appendices which provide a quick reference section and a comprehensive collection of thermomechanical data allows rapid access and understanding of the subject and its phenomena. The concepts and techniques described in this work can usefully be applied to solve a multitude of problems encountered by those investigating fracture and damage in materials, impact dynamics, metal working and other areas. This reference book has come about in response to the pressing demand of mechanical and metallurgical engineers for a high quality summary of the knowledge gained over the last twenty years. While fulfilling this requirement, the book is also of great interest to academics and researchers into materials performance.Table of Contents
| 1 | Introduction | 1 |
| 1.1 | What is an Adiabatic Shear Band? | 1 |
| 1.2 | The Importance of Adiabatic Shear Bands | 6 |
| 1.3 | Where Adiabatic Shear Bands Occur | 10 |
| 1.4 | Historical Aspects of Shear Bands | 11 |
| 1.5 | Adiabatic Shear Bands and Fracture Maps | 14 |
| 1.6 | Scope of the Book | 20 |
| 2 | Characteristic Aspects of Adiabatic Shear Bands | 24 |
| 2.1 | General Features | 24 |
| 2.2 | Deformed Bands | 27 |
| 2.3 | Transformed Bands | 28 |
| 2.4 | Variables Relevant to Adiabatic Shear Banding | 35 |
| 2.5 | Adiabatic Shear Bands in Non-Metals | 44 |
| 3 | Fracture and Damage Related to Adiabatic Shear Bands | 54 |
| 3.1 | Adiabatic Shear Band Induced Fracture | 54 |
| 3.2 | Microscopic Damage in Adiabatic Shear Bands | 57 |
| 3.3 | Metallurgical Implications | 69 |
| 3.4 | Effects of Stress State | 73 |
| 4 | Testing Methods | 76 |
| 4.1 | General Requirements and Remarks | 76 |
| 4.2 | Dynamic Torsion Tests | 80 |
| 4.3 | Dynamic Compression Tests | 91 |
| 4.4 | Contained Cylinder Tests | 95 |
| 4.5 | Transient Measurements | 98 |
| 5 | Constitutive Equations | 104 |
| 5.1 | Effect of Strain Rate on Stress-Strain Behaviour | 104 |
| 5.2 | Strain-Rate History Effects | 110 |
| 5.3 | Effect of Temperature on Stress-Strain Behaviour | 114 |
| 5.4 | Constitutive Equations for Non-Metals | 124 |
| 6 | Occurrence of Adiabatic Shear Bands | 125 |
| 6.1 | Empirical Criteria | 125 |
| 6.2 | One-Dimensional Equations and Linear Instability Analysis | 134 |
| 6.3 | Localization Analysis | 140 |
| 6.4 | Experimental Verification | 146 |
| 7 | Formation and Evolution of Shear Bands | 155 |
| 7.1 | Post-Instability Phenomena | 156 |
| 7.2 | Scaling and Approximations | 162 |
| 7.3 | Wave Trapping and Viscous Dissipation | 167 |
| 7.4 | The Intermediate Stage and the Formation of Adiabatic Shear Bands | 171 |
| 7.5 | Late Stage Behaviour and Post-Mortem Morphology | 179 |
| 7.6 | Adiabatic Shear Bands in Multi-Dimensional Stress States | 187 |
| 8 | Numerical Studies of Adiabatic Shear Bands | 194 |
| 8.1 | Objects, Problems and Techniques Involved in Numerical Simulations | 194 |
| 8.2 | One-Dimensional Simulation of Adiabatic Shear Banding | 199 |
| 8.3 | Simulation with Adaptive Finite Element Methods | 213 |
| 8.4 | Adiabatic Shear Bands in the Plane Strain Stress State | 218 |
| 9 | Selected Topics in Impact Dynamics | 229 |
| 9.1 | Planar Impact | 230 |
| 9.2 | Fragmentation | 237 |
| 9.3 | Penetration | 244 |
| 9.4 | Erosion | 255 |
| 9.5 | Ignition of Explosives | 261 |
| 9.6 | Explosive Welding | 268 |
| 10 | Selected Topics in Metalworking | 273 |
| 10.1 | Classification of Processes | 273 |
| 10.2 | Upsetting | 276 |
| 10.3 | Metalcutting | 286 |
| 10.4 | Blanking | 293 |
| Appendices | 297 | |
| A | Quick Reference | 298 |
| B | Specific Heat and Thermal Conductivity | 301 |
| C | Thermal Softening and Related Temperature Dependence | 312 |
| D | Materials Showing Adiabatic Shear Bands | 335 |
| E | Specification of Selected Materials Showing Adiabatic Shear Bands | 341 |
| F | Conversion Factors | 357 |
| References | 358 | |
| Author Index | 369 | |
| Subject Index | 375 |
