The effects of interfacial debonding on the elastoplastic response of unidirectional silicon carbide—titanium composites

Proceedings of the Institution of Mechanical Engineers, Part C:

2016

A three-dimensional micromechanics-based analytical model is developed to investigate the influence of interphase on the thermo-mechanical properties of three-phase composites. The representative volume element (RVE) of composites is extended to c × r × h cells in three dimensions and the RVE consists of three phases including filler, matrix and interphase. The arrangement state of filler within the matrix materials is assumed to be random with uniform distribution. Fillers are surrounded by the interphase in the whole composite. The effects of interphase such as its thickness and stiffness on the thermo-mechanical properties of composite with various aspect ratios of filler are studied. The results illustrate that while the effects of interphase is significant for composites with randomly distributed spherical particles, it turns to be less effective as the aspect ratio of filler of composite increases. Moreover, the results demonstrate that the effect of interphase on the thermo-mechanical properties of fibrous composites in the transverse direction is more significant than that of fiber composites in the longitudinal direction.

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interphase effects on the thermo-mechanical properties of three-phase composites

Proceedings of the Institution of Mechanical Engineers, Part C:

2016

“…Another advantage of the SUC method is its ability to give closed-form solutions to evaluate the composite material response to shear and normal loadings (Falahatgar et al, 2009; Mahmoodi et al, 2010; Sayyidmousavi et al, 2015). Numerous research studies have revealed the validity of the model to predict the overall behavior of conventional composites (Falahatgar et al, 2009; Mahmoodi and Aghdam, 2011; Mahmoodi et al, 2010; Sayyidmousavi et al, 2015). The SUC micromechanical model was later extended by Ansari and Hassanzadeh-Aghdam (2016a, 2016b) to calculate the linear and non-linear viscoelastic properties of CNT-reinforced polymer nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Interphase influences on the mechanical behavior of carbon nanotube–shape memory polymer nanocomposites: A micromechanical approach

Journal of Intelligent Material Systems and Structures

et al. 2018

The effects of interphase characteristics on the elastic behavior of randomly dispersed carbon nanotube–reinforced shape memory polymer nanocomposites are investigated using a three-dimensional unit cell–based micromechanical method. The interphase region is formed due to non-bonded van der Waals interaction between a carbon nanotube and a shape memory polymer. The influences of temperature, diameter, volume fraction, and arrangement type of carbon nanotubes within the matrix as well as two interphase factors, including adhesion exponent and thickness on the carbon nanotube/shape memory polymer nanocomposite’s longitudinal and transverse elastic moduli, are explored extensively. Moreover, the results are presented for the shape memory polymer nanocomposites containing randomly oriented carbon nanotubes. The obtained results clearly demonstrate that the interphase region plays a crucial role in the modeling of the carbon nanotube/shape memory polymer nanocomposite’s elastic moduli. It is observed that the nanocomposite’s elastic moduli remarkably increase with increasing interphase thickness or decreasing adhesion exponent. It is found that when the interphase is considered in the micromechanical simulation, the shape memory polymer nanocomposite’s elastic moduli non-linearly increase as the carbon nanotube diameter decreases. The predictions of the present micromechanical model are compared with those of other analytical methods and available experiments.

“…This article deals with the thermal expansion behavior of SiO 2 –SMP nanocomposites using the SUC micromechanics model (Ansari et al, 2016a; Ansari and Hassanzadeh-Aghdam, 2016a, 2016b; Falahatgar et al, 2009; Hassanzadeh-Aghdam et al, 2018; Mahmoodi and Aghdam, 2011b; Mahmoodi et al, 2010a, 2010b). The rest of the article is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

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

Journal of Intelligent Material Systems and Structures

2018

In this study, a unit cell–based micromechanical approach is proposed to analyze the coefficient of thermal expansion of shape memory polymer nanocomposites containing SiO2 nanoparticles. The interphase region created due to the interaction between the SiO2 nanoparticles and shape memory polymer is modeled as the third phase in the nanocomposite representative volume element. The influences of the temperature, volume fraction, and diameter of the SiO2 nanoparticles on the thermal expansion behavior of shape memory polymer nanocomposite are explored. It is observed that the coefficient of thermal expansion of shape memory polymer nanocomposite decreases with the increase in the volume fraction up to 12%. Also, the results reveal that with the increase in temperature, the shape memory polymer nanocomposite coefficient of thermal expansion linearly increases. The role of interphase region on the thermal expansion response of the shape memory polymer nanocomposite is found to be very important. In the presence of interphase, the reduction in nanoparticle diameter leads to lower coefficient of thermal expansion for shape memory polymer nanocomposite, while the variation of nanoparticles diameter does not affect the coefficient of thermal expansion in the absence of interphase. Based on the simulation results, the shape memory polymer nanocomposite coefficient of thermal expansion decreases as the interphase thickness increases. In addition, the contribution of interphase coefficient of thermal expansion to the shape memory polymer nanocomposite coefficient of thermal expansion is more significant than that of interphase elastic modulus.