Analytical models of the strength and ductility of CNT reinforced metal matrix nano composites under elevated temperatures

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:813

Article

Song, Shutao¹  He, Xu^1,2,3  Zhou, Qiang¹  Ren, Luyang¹  Chen, Quanfang^1,4  Bai, Yuanli¹ 

[1] Univ Cent Florida, Dept Mech & Aerosp Engn, 4000 Cent Florida Blvd, Orlando, FL 32816 USA

[2] Southwest Jiaotong Univ, State Key Lab Tract Power, Chengdu 610031, Sichuan, Peoples R China

[3] Southwest Jiaotong Univ, Sch Mech & Engn, Chengdu 610031, Sichuan, Peoples R China

[4] Univ Cent Florida, MEMS & Nanomat Lab, Orlando, FL 32816 USA

关键词: CNT reinforced Composites;    Material strength;    Ductility loss;    High temperature;    Strength-ductility tradeoff;   

DOI  :  10.1016/j.msea.2021.141078

来源: Elsevier

【 摘 要 】

Carbon nanotubes (CNTs) can greatly enhance the strength of metal matrix composites while resulting in ductility loss. This strength-ductility tradeoff dilemma always confines the development of material design and real-life applications. In this work, a temperature dependent strengthening analytical model is proposed for CNT reinforced metal matrix composites which considers three common strengthening mechanisms: Orowan looping effect, thermal expansion mismatch effect, and load bearing effect. The proposed model can predict composite material strength with different volume fractions of CNTs and under different temperatures. Combining the strengthening model with the stress based modified Mohr-Coulomb (sMMC) ductile fracture model, a ductility analytical model is then derived. This ductility analytical model includes the influences of temperature, multiaxial stress loading conditions, as well as the aforementioned three strengthening mechanisms. A good agreement has been achieved between literature published experimental data and analytical predictions for both composite material strength and ductility loss. The proposed two analytical models can provide a straightforward way to study the strength-ductility relationship for CNT reinforced metal matrix composites over a wide range of temperatures and different stress states, and then provide guidance on new material design and processing.

【 授权许可】

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