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Elastic characteristics of an interfacial layer formed by polymeric matrix composites


Poisson's ratios for interfacial layers of polymer matrix composites


Mechanical properties of interface layers in polymer matrix composites for large elastic deformations


The effect of the concentration of the dispersed elastic filler on the lower yield stress of matrix composites based on plastic polymers is studied.


The effect of the concentration of the dispersed elastic filler on the lower yield stress of matrix composites based on plastic polymers is studied.

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 Extensive literature has emerged on the fracture behavior of metal matrix composite materials. However, very few of the articles were publi shed on the fracture behavior of soft metal matrix composite materials.The purpose of this paper is to research into the fracture process of leadbase alloy composites which are reinforced with carbon fiber by using liquid infiltration method. Their tensile fracture features are investigated with the scanning electron microscope. The conclusion is as follows ,the plastic... Extensive literature has emerged on the fracture behavior of metal matrix composite materials. However, very few of the articles were publi shed on the fracture behavior of soft metal matrix composite materials.The purpose of this paper is to research into the fracture process of leadbase alloy composites which are reinforced with carbon fiber by using liquid infiltration method. Their tensile fracture features are investigated with the scanning electron microscope. The conclusion is as follows ,the plastic property of the matrix, interfacial strengch between carbon fiber and matrix and the distribution of fiber in matrix all influence the fracture path of leadbase alloy composites to a large extent.The authors point out that the combination of strength and ductility of metal matrix and a strong interfacial bonding of fiber and matrix should be required for soft metal matrix composites.  本文旨在通过碳纤维增强铅基复合材料的断裂过程分析,探索软金属基体经纤维增强后其复合材料的断裂行为。作者选择了纯Pb、PbSn10％、PbSn5％Sb17％三种不同成份的合金作为基体制成复合材料,拉断后对断口进行了宏观和扫描电镜观察,结果表明:基体本身的机械性能、纤维与基体间界面的结合强弱及纤维在基体中分布均匀程度均影响铅基复合材料的断裂过程,从而影响复合材料的拉伸强度。因此文章指出,软金属基复合材料欲获得高的断裂强度,应选择强韧性有一定配合的基体,并具有适当的基体与纤维的界面结合强度,纤维在基体中的均匀分布也应设法保证。  Fatigue life prediction on composite materials is studied analytically using degradation and damage models, resultant strain and fatigue modulus. Definition of fatigue modulus, new damage models using fatigue modulus and resultant strain, and prediction of fatigue life on composite materials using degradation and damage models are discussed. This approach can accurately predict the multistress level fatigue life as well as singlestress level fatigue life of composite materials. Defining fatigue damage on... Fatigue life prediction on composite materials is studied analytically using degradation and damage models, resultant strain and fatigue modulus. Definition of fatigue modulus, new damage models using fatigue modulus and resultant strain, and prediction of fatigue life on composite materials using degradation and damage models are discussed. This approach can accurately predict the multistress level fatigue life as well as singlestress level fatigue life of composite materials. Defining fatigue damage on composite materials is not a simple problem. Common variables used to define damage of composite materials are secant modulus, residual strength, strain, compliance, amount of acoustic emission, crack density, crack length, and number of debonded or failed fibers. These damage models are tabulated in Table 1. However, variable can not be used universally to represent the degree of damage in various composite materials. Fatigue modulus is defined using secant modulus and resultant strain during fatigue cycle. Fatigue modulus represents the physical damage in composites with different orientation and materials., specially metalmatrix and ceramicmatrix composites for high temperature applications. Damage model , model and model are defined as functions of fatigue modulus and resultant strain. The structure of damage model, boundary conditions and physical meanings are inserted in order to interpret the proposed damage models. Also the effect of applied stress on the accumulated damage is studied analytically using proposed damage models. Fatigue life is predicted by the following procedures:(1) establish the fatigue modulus degradation, (2) find fatigue life equation as a function of fatigue modulus,(3) calculate the fatigue life using strain failure criterion. Degradation models for composite damage are generalized and found that threeparameter degradation model(dF/dn=ACn~c1/ BF~B1) and twoparameter power function model(dF/dn=ACn~C1) are most suitable to predic ting fatigue life of composites. Also the predicted twostress level fatigue life using the proposed da mape models are reasonably close to the experimental data.  在疲劳载荷作用下,复合材料的弹性模量会随着载荷循环数的增加而不断下降,而材料中的内部损伤则不断增大。为此,本文提出复合材料的疲劳模量和累积应变的概念,并由此定义出三种预测复合材料疲劳寿命的疲劳损伤模型。文中应用这三种模型对单应力水平和多应力水平下的玻璃纤维增强环氧树脂复合材料的疲劳寿命进行了估算,并同实验结果进行了比较。  A review is given of development of the metal matrix composite materials in China during the present time. Particular topics of introduction and discussion include the reinforcements, matrices and various species of metal matrix composites, the new fabrication techniques and applications as well as the research work dealing with the interface behaviors, mechanical properties and fracture process of the composites, especially for the Chinese literatures which involve in these topics are concerned.... A review is given of development of the metal matrix composite materials in China during the present time. Particular topics of introduction and discussion include the reinforcements, matrices and various species of metal matrix composites, the new fabrication techniques and applications as well as the research work dealing with the interface behaviors, mechanical properties and fracture process of the composites, especially for the Chinese literatures which involve in these topics are concerned. Suggestions regarding to the further development of metal matrix composites to realize its potential fully are also presented.  本文对金属基复合材料目前的进展进行了综述,内容包括增强体、基体及各种金属基复合材料;新的加工技术和应用,以及有关金属基复合材料的界面行为,力学性能和破坏过程的研究情况,特别着重介绍了国内的研究工作,对金属基复合材料在今后的发展中如何充分发挥潜力也作了设想。   << 更多相关文摘 
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