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hybrid effect on mechanical properties and high-temperature performance of copper matrix composite reinforced with micro-nano dual-scale particles

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Journal of Materials Science & Technology 2024年第5期172卷 94-103页

作者： Xingde Zhang Yihui Jiang Fei Cao Tian Yang Fan Gao Shuhua Liang School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Engineering Research Center of Conducting Materials and Composite Technology Ministry of EducationXi’an University of TechnologyXi’an 710048China Shaanxi Province Key Laboratory of Electrical Materials and Infiltration Technology Xi’an University of TechnologyXi’an 710048China

A dual-scale hybrid HfB_(2)/Cu-Hf composite with HfB_(2) microparticles and Cu_(5) Hf nanoprecipitates was designed and *** contribution of the hybrid effect to the mechanical properties and high-temperature performances was studied from macro and micro perspectives,*** hybrid of dual-scale particles can make the strain distribution of the composite at the early deformation stage more uniform and delay the strain concentration caused by the HfB_(2) *** dislocation pinning of HfB_(2) particles and the coherent strengthening of Cu_(5) Hf nanoprecipitates simultaneously play a strengthening role,but the strength of the hybrid composite is not a simple superposition of two strengthening *** addition,both Cu_(5) Hf nanoprecipitates and HfB_(2) microparticles contribute to the high-temperature performance of the composite,the growth and phase transition of nanoprecipitates at high temperature will reduce their contribution to strength,while the stable HfB_(2) particles can inhibit the coarsening of matrix grains and maintain the high-density geometrically necessary dislocations(GNDs)in the matrix,which ensures more excellent high-temperature resistance of the hybrid *** a result,the hy-brid structure can simultaneously possess the advantages of multiple reinforcements and make up for the shortcomings of each ***,a copper matrix composite with high strength,high conductivity,and excellent high-temperature performance is displayed.

关键词： Copper matrix composite HfB 2 particles hybrid effect High strength and high conductivity High-temperature performance

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STUDY ON TENSILE FAILURE MECHANISM AND hybrid effect OF INTRAPLY hybrid COMPOSITES

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Acta Mechanica Solida Sinica 2003年第1期16卷 33-40页

作者： Zeng Qingdun Lin Xuehui S China Univ Technol Coll Traff & Commun Guangzhou 510640 Peoples R China

The random critical-core model is adapted to investigate the tensile failuremechanism and hybrid effect of unidirectionally arrayed hybrid composites with alternating low andhigh elongation fibers. By utilizing the model in conjunction with the results of the stressconcentration analysis in which the interfacial damage between fiber and matrix is considered, amicroscopic statistical analysis of both the first failure and ultimate failure of hybrids isperformed. The variations of the first failure strain, the ultimate failure strain and the hybrideffect as the interfacial shear strength are obtained quantitatively. The concept of the hybrideffect for strains has been clarified. The present results are compared with available experimentdata and a reasonable agreement is found between the analytical predictions and the experimentalresults.

关键词： intraply hybrid composites failure statistical analysis hybrid effect

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Filler Size effect on Tuning Electrical,Mechanical,and Thermal Properties of Field Grading Composites

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CSEE Journal of Power and Energy Systems 2023年第2期9卷 743-750页

作者： Xiaolei Zhao Jun Hu Xiao Yang Zhiwen Huang Xingming Bian Yuanbao Lin Jinliang He Key Laboratory of Control of Power Transmission and Conversion Ministry of EducationShanghai Jiao Tong UniversityShanghai200240 China Department of Chemistry University of OxfordOxfordOX13TAUK State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua UniversityBeijing 100084China North China Electric Power University School of Electrical and Electronic EngineeringBeijing 102206China

field-grading composite with a low switching field,stable nonlinear conductivity performance,and excellent mechanical and thermal properties was prepared by using hybrid ZnO micro-spherical varistors of different particle sizes as the fillers and silicone rubber as the *** hybrid effects of particle size on the electrical,mechanical,and thermal properties of ZnO micro-spherical varistors composites are *** increase in the ZnO micro-spherical varistor size in the composites will lower the switching field but lead to degradation of the mechanical properties and stability of the nonlinear conductivity *** silicone rubber is incorporated with a mixture of hybrid ZnO micro-spherical varistors of different sizes at an optimal mass ratio range exhibited low switching field,stable nonlinear conductivity performance,and excellent mechanical and thermal *** findings are helpful to comprehensively regulate performance of advanced field-grading materials and increase stability and durability of electronic and electrical devices.

关键词： Electrical properties field grading material hybrid effect mechanical properties ZnO micro-spherical varistor

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A STUDY ON THE 1N SITU TRANSVERSE TENSILE LAMINA STRENGTH AND THE CLASSICAL SOLUTION OF THE OPENING MODE CRACK IN A0/90/0 LAMINATE

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Acta Mechanica Sinica 1988年第4期 327-336页

作者： Fan Fuqun Dong Wanlin (South China University of Technology)Wang Jianxiang (Chengdu University of Science and Technology)

In this paper the classical solution of the opening mode crack in the 90° layer of 0/90/0laminates has been determined by means of Fourier transformations and the procedure of Copson for a pair ofdual integral *** fraeture behavior and the in situ transverse strength of the 90° layer have beenquantitatively studied in graphite/epoxy laminates,based on the solution obtained *** results show that the stress intensity factor of this kind of laminates,which is different from that of asingle undirectional 90°*** with the increase in thiekness *** modulus E_ or GLTof the 0°layerand also decreases with the decrease in the thickness of the 90° *** the lamination effect manifests itselfand the in situ transverse strength of the 90°layer is thereby *** theoretical calculations agreewith the experimental data presented by ***.

关键词： in situ transverse tensile lamina strength hybrid effect lamination effect synergic effect classical solution fracture behavior of laminated composites statistical fracture mechanics analysis

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