Elastoplastic behavior of the metal matrix nanocomposites containing carbon nanotubes: A micromechanics-based analysis

Abstract

The elastoplastic behavior of aluminum (Al) nanocomposites reinforced with aligned carbon nanotubes (CNTs) is characterized using a unit cell micromechanical model. The interphase zone caused by the chemical reaction between CNT and Al matrix is included in the analysis. To attain the elastoplastic stress–strain curve of the nanocomposites, the successive approximation method together with the von Mises yield criterion is employed. The effects of several important factors including the volume fraction and diameter of CNT, material properties, and size of interphase on the elastoplastic stress–strain curve of the nanocomposites during uniaxial tension are studied. The results indicate that the interphase characteristics significantly affect the elastoplastic behavior of the CNT-reinforced Al nanocomposites. It is also found that the yield stress of the nanocomposites rises with increasing CNT volume fraction or decreasing CNT diameter. Besides, the elastoplastic stress–strain curve of the CNT-reinforced Al nanocomposites is presented for multiaxial tension. The initial yield envelopes of the nanocomposites under longitudinal–transverse biaxial tension are provided too. Comparison between the elastic results of the present model with those of other available micromechanical analyses shows a very good agreement.

Atomistic behavior of nanoporous carbon nanotube-aluminum composite under compressive loading

“…The early failure is likely influenced by the buckling behavior of CNT, which was found at the failure strain of CNT (see figure 7). Additionally, the Young's modulus of Al decreased in the matrix phase, which suggests that the interphase model can be used to analyze composite properties [40,41]. In the next sections, the effects of CNT volume fraction and CNT size on mechanical properties are investigated with interphase analysis.…”

Effects of added SiO2 nanoparticles on the thermal expansion behavior of shape memory polymer nanocomposites

“…Thus, one may use the present SUC approach for intuitive predictions of the effective properties of the composite systems. Other advantages of the presented SUC micromechanical model are simplicity and efficiency, applicable to elastic, viscoelastic, plastic, viscoplastic, thermal, electrical properties, extendable to different geometrics of reinforcement phase, considering some different materials simultaneously (Haghgoo et al, 2017, 2018; Hassanzadeh-Aghdam, 2018; Hassanzadeh-Aghdam et al, 2017; Mahmoodi et al, 2018).…”

Multiscale analysis of the low-velocity impact behavior of ceramic nanoparticle-reinforced metal matrix nanocomposite beams by micromechanics and finite element approaches

“…10,11 Also, for reinforcements, the use of ceramic nanoparticles such as silicon carbide (SiC), alumina (Al 2 O 3 ), Ti 2 AlC, and carbon nanotubes (CNTs) has been widely reported in the literature. 6,[12][13][14] As compared to other nanoscale particles, due to its comparatively high mechanical properties, availability, and low cost, SiC is very attractive and broadly used to reinforce the MMNCs. 15,16 It is recognized that the effective mechanical performance of MMNCs is critically controlled by the volume fraction (VF), dispersion and size of the nanoscale particles, thermo-mechanical properties of the matrix, and the reinforcement as well as the nature of the metal matrix-particle interface.…”