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A UNIFIED ENERGY APPROACH TO A CLASS OF micromechanics models FOR COMPOSITE MATERIALS

Acta Mechanica Sinica 1995年第1期11卷 59-75页

作者：黄永刚黄克智胡凯雄 A.Chandra Dept.of Aerospace and Mech.Eng. The University of ArizonaTucsonAZ 85721USA Dept.of Engineering Mechanics Tsinghua UniversityBeijing 100084China

Several micromechanics models for the determination of composite moduli are investigated in this paper,including the dilute solution,self-consistent method,generalized self-consistent method,and Mori-Tanaka's *** mi- cromechanical models have been developed by following quite different approaches and physical *** is shown that all the micromechanics models share a common ground,the generalized Budiansky's energy-equivalence *** dif- ference among the various models is shown to be the way in which the average strain of the inclusion phase is *** a bonus of this theoretical development,the asymmetry suffered in Mori-Tanaka's method can be circumvented and the applica- bility of the generalized self-consistent method can be extended to materials contain- ing microcracks,multiphase inclusions,non-spherical inclusions,or non-cylindrical *** relevance to the differential method,double-inclusion model,and Hashin-Shtrikman bounds is also *** application of these micromechanics models to particulate-reinforced composites and microcracked solids is reviewed and some new results are presented.

关键词： micromechanics models energy-equivalence framework dilute solution self-consistent method generalized self-consistent method Mori-Tanaka's method

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Enhanced flexural performance of epoxy polymer concrete with short natural fibers

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Science China(Technological Sciences) 2018年第8期61卷 1107-1113页

作者： HU Bin ZHANG NanLi LIAO YuTian PAN ZhiWei LIU YiPing ZHOU LiCheng LIU ZeJia JIANG ZhenYu School of Civil Engineering and Transportation State Key Laboratory of Subtropical Building Science South China University of Technology The State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences

Epoxy polymer concrete(EPC) has found various applications in civil engineering. To enhance the flexural performance of EPC,two kinds of short natural fibers with high specific strength(sisal fibers and ramie fibers) have been incorporated into EPC. The results of mechanical tests show that a small loading of natural fibers(0.36 vol%) can significantly increase the flexural strength of EPC by 25.3%(ramie fibers) or 10.4%(sisal fibers). This enhancement is achieved without any sacrifice of compressive strength of EPC. The reinforcing effects of short natural fibers on the flexural properties and compressive properties of EPC decrease with further increase in fiber content, due to the insufficient wetting of fibers by epoxy resin which results in poor interfacial bonding. The reinforcing mechanisms of short natural fibers are explored according to the observation of fracture surfaces and micromechanical modelling. It is found that the parallel model based on the rule of mixture can be a good approximation to describe the improvement in flexural strength of the short natural fiber reinforced EPC at low fiber volume fractions.

关键词： epoxy polymer concrete (EPC) natural fibers fiexural strength micromechanics models

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micromechanics of Thermal Conductive Composites:Review,Developments and Applications

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Acta Mechanica Solida Sinica 2024年第2期37卷 215-237页

作者： Guannan Wang Yulin Huang Mengyuan Gao Qiang Chen Department of Civil Engineering Zhejiang UniversityHangzhou310058China Center for Balance Architecture Zhejiang UniversityHangzhou310007China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an710049China

micromechanics investigations of composites with fiber-shaped reinforcement are extensively applied in the engineering design and theoretical analysis of thermal composites in the aerospace engineering and high-tech *** this paper,a critical review of various classical micromechanics approaches is provided based on the classification framework and the development of micromechanics *** numerical micromechanics tools have been developed to overcome limitations through exactly/approximately solving the internal governing equations of *** connections and limitations of those models are also investigated and discussed,based on which three recently developed numerical or semi-analytical models are explained,including finite-element micromechanics,finite-volume direct averaging micromechanics,and locally exact homogenization theory,as well as machine learning *** it is almost inevitable to mention the interfacial effects on thermal behavior of fibrous composites,we review the new mathematical relations that interrupt the original continuity conditions due to the existence of interphase/interface within unit *** speaking,the interphase/interface is demonstrated to play a significant role in influencing the effective coefficients and localized thermal *** present work also briefly reviews the application of micromechanics tools in emerging engineered woven composites,natural fibrous composites,and ablative thermal protection *** is demonstrated that sophisticated micromechanics tools are always demanded for investigating the effective and localized responses of thermal fibrous composites.

关键词： micromechanics models Thermal fibrous composites Microstructural detail-free models Semi-analytical and numerical methods Interfacial effects Woven composites Natural composites

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