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微结构力学     
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  micro structural mechanics
     Micro Air Vehicles (MAV) are complicated Micro Electro Mechanical Systems (MEMS). They involve multidisciplines such as micro machine design, micro structural mechanics, micro dynamics, micro fluid mechanics, micro aerodynamics, micro themology, micro tribology, electronic control.
     微型飞行器是复杂的微机电系统 ,研究涉及微机械设计、微结构力学、微动力学、微流体力学、微气体动力学、微热学、微摩擦学、电子控制等多个学科。
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  micro-structural mechanical
     Damage mechanics method is applied to study fatigue problems of metallic structure members. Using the micro-structural mechanical model, the anisotropic damage coupled constitutive relations and finite element-additional loading method are established.
     引用损伤力学方法研究金属构件疲劳问题,并采用微结构力学模型建立了各向异性疲劳损伤本构关系与附加力.
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  microstructure mechanics
     On the other hand, the research condition about soil microstructure and microstructure mechanics model are discussed.
     另一方面 ,阐述了土的微观结构和土微结构力学模型的研究状况。
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  “微结构力学”译为未确定词的双语例句
     MECHANICAL ANALYSIS OF RANDOM MICRO-STRUCTURE OF SHORT FIBRE COMPOSITE MATERIAL
     短纤维复合材料的随机微结构力学分析
短句来源
     Mechanical Analysis of Micro Structure of Random Short Fiber Composite Material
     随机短纤维复合材料微结构力学分析
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     Soil Micromechanics Concept,View and Core
     土体微结构力学——概念·观点·核心
短句来源
     A growing point of engineering geology in 21st century soil micromechanics
     21世纪工程地质学生长点:土体微结构力学
短句来源
     Adopting micro-structure model,the anisotropic damage coupled constitutive relations is established for axi-symmetric cases to design the procedure considering anisotropic damage with finite element-additional loading method.
     在微结构力学模型基础上建立轴对称的各向异性疲劳损伤本构关系,通过有限元-附加力解法编制考虑各向异性损伤的有限元程序。
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    This paper integrated micromechanics with finite element analysis to predict the moduli and Poisson's ratios of three dimensional carbon-carbon camposites. The effects of interfacial defects, nonlinear shear behavior of fiber bundle,error in measuring the secondary properties of fiber bundle and different weave of carbon-carbon materials on the macroscopic. prope-rties were discussed. To justify the theoretical predictons the comparison with experimental results was shown. The conclusions of this paper are...

    This paper integrated micromechanics with finite element analysis to predict the moduli and Poisson's ratios of three dimensional carbon-carbon camposites. The effects of interfacial defects, nonlinear shear behavior of fiber bundle,error in measuring the secondary properties of fiber bundle and different weave of carbon-carbon materials on the macroscopic. prope-rties were discussed. To justify the theoretical predictons the comparison with experimental results was shown. The conclusions of this paper are as follows: 1. The modeling of the microstructure of the multi-dimensional carbon-carbon integrated with finite element analysis can give satisfactory predictions of macroscopic elastic constants; 2. Interfacial defects are the major cause of macroscopic nonlinear shear behavior of carbon carbon materials; 3. The effects of nonlinear stress-strain relationship of fiber bundle on the macroscopic properties are also nonnegligible; 4. The error in measuring the secondary properties of fiber bundle, e. g. E_T, will not induce significant discrepancy; 5. The different weave of three-dimensional carbon-carbon compositeswill not cause remarkable difference in macroscopic properties, provided the fiber volume fractions remain the same.

    为了给设计者提供筛选材料的依据,在制造多向碳/碳复合材料前,需预先了解其主要力学性能。本文结合微结构力学和有限元分析,预报其弹性常数。并讨论界面质量,剪切非线性以及编织方式的影响,理论预报与实验结果的比较,说明理论模型应该考虑的问题。

    First of all,the development of inherent damage near notch tip in 3D carbon carbon was examined with polariscopic microscope while loading. The notch tip was tracked With a specially designed adjustable stand and loading appratus during testing.Based on the observation,a very simple anaiytical model was established.In order to use micromechanics to pre- dict the notched strength,the strength of in-situ fiber bundle was mea- sured with a specially designed fixture.The strength of 3D carbon carbon is dominated...

    First of all,the development of inherent damage near notch tip in 3D carbon carbon was examined with polariscopic microscope while loading. The notch tip was tracked With a specially designed adjustable stand and loading appratus during testing.Based on the observation,a very simple anaiytical model was established.In order to use micromechanics to pre- dict the notched strength,the strength of in-situ fiber bundle was mea- sured with a specially designed fixture.The strength of 3D carbon carbon is dominated by the longitudinal strength of the portion of fiber bundle, where the stress concentration takes place.Hedgepeth′s stress concentration factor for infinite plate is corrected for finite plate.Calculation of stress concentration factors of fiber bundles near notch tip also shows that fai- lure of a single fiber bundle will cause total rupture of the specimen.With Zweben's statical strength criterion,the strength of the notched 3D car- bon carbon was predicted and the prediction agrees with experimental resu- lts quite well.

    首先,一面加载,一面用偏光显微镜观察切口附近的先天缺欠的发展情况。为了跟踪切口尖端,设计了加载装置和可调台架。在观察基础上建立起一个非常简单的计算模型。为了用微结构力学来预报其切口强度,设计一个专用夹具来测量纤维束的强度。含切口的三向碳碳材料的强度实际上是切口附近应力集中发生的那一段纤维束的纵向强度所决定的。修正 Hedgepeth 的无限大板的应力集中系数。用 Zweben的统计强度准则作强度预报,与实验结果作比较。

    In light of computational micromechanics methodology,the elastic performances of aggregate structures of alloy materials,commonly used in mechanical engineering,are emulated numerically by multi regional boundary element method.The numerical statistical laws of elastic stress and strain data from the emulation are analyzed through optimal fitting test of EDF statistical quantities.The mechanical models of material microstructures are constructed,applying probabilistic arithmetic geometry algorithm to shape...

    In light of computational micromechanics methodology,the elastic performances of aggregate structures of alloy materials,commonly used in mechanical engineering,are emulated numerically by multi regional boundary element method.The numerical statistical laws of elastic stress and strain data from the emulation are analyzed through optimal fitting test of EDF statistical quantities.The mechanical models of material microstructures are constructed,applying probabilistic arithmetic geometry algorithm to shape their morphology and Monte Carlo technique to determine the elastic principal direction of each crystal grain.Not only has possibility of computerizing mechanical properties of materials under microscopical size been attempted,but also some valuable conclusions are drawn,which can help to design macroscopical strength reliability of engineering materials based on probabilistic theory.

    以计算微观力学的分析观点,力图在清晰的物理、几何图像下,应用多域边界元数值算法,对工程机械中承力构件常见的合金材料微结构的弹性性质进行数值仿真。由仿真所获得的弹性应力应变数据,采用EDF统计量进行拟合优度检验,获得了材料微结构表观弹性参数的数值统计规律。为构造材料微结构的力学计算模型,本文采用概率计算几何方法生成其几何网络,应用MonteCarlo技术投放各晶粒的材料主轴方向。本文不仅尝试了在微结构尺度下进行力学分析的可能性,而且获得了诸多有积极意义的结论,这有助于建立在概率基础上的可靠性宏观强度设计。

     
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