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The viscoelastic damping of nanocomposites reinforced with BNNTs and CNTs was compared. MD simulations revealed that the interfacial damping of pristine-CNT was superior to that of pristine-BNNT. The contrasting effects of structural defects were elucidated using interfacial adhesion, interphase, and overlapping phonon density of states in the nanotubes and polymers. [ABSTRACT FROM AUTHOR]

T‐300 6K carbon fabric fiber‐reinforced epoxy laminated composites are prepared by in‐situ and hot‐compression molding technique. The main emphasis of this study is to examine the impact of the structural deformations on fiber orientations of laminated composites during vibrational damping, stiffness, and electromagnetic interference (EMI) shielding properties. The damping properties of carbon fiber laminated composites are analyzed in terms of natural frequency and logarithmic decrement. The digital image correlation technique has been used to measure the mode shape behavior of carbon fiber reinforced polymer (CFRP) composites. The dynamic behavior of the CFRP laminated composites has significant effect on the fiber orientations in terms of storage, loss modulus, and damping ratio. The value of EMI shielding of CFRP laminated composites of T‐300 6K based CFRP polymer laminated composites has slight variations in the SET and their values are 107.17 (B‐45), 106.33 (B‐30), and 110.0 dB (B‐0). The vibrational and EMI shielding properties are showing a huge potential for these kinds of CFRP laminated composites in military and aircraft applications. Highlights: CFRP laminated epoxy composites were fabricated by hand layup technique.The ply orientation of CFRP composites were affected the mechanical properties.DIC was used to determine the mode shapes of laminated composites.CFRP laminated composite exhibited excellent EMI properties. [ABSTRACT FROM AUTHOR]

The reinforcement effect of boron nitride nanotube (BNNT) and carbon nanotube (CNT) on thermoelastic behavior of poly(methyl methacrylate) (PMMA) nanocomposites was compared through a molecular dynamics (MD) simulation and mean-field micromechanics model. Uniaxial tension, shearing, cooling down, and pullout simulations were implemented in MD simulations. In micromechanics, the multi-inclusion (M–I) model was adopted. Both nanocomposites showed similar transversely isotropic elastic constants and coefficients of thermal expansion (CTEs). BNNTs provided better interfacial load transfer and dispersibility with PMMA; meanwhile, CNTs reduced the CTE of the matrix more. For both nanocomposites, the thermoelastic behavior was sensitive to the interfacial imperfection and interphase zone. [ABSTRACT FROM AUTHOR]