Investigation of crack resistance in epoxy/boron nitride nanotube nanocomposites based on multi-scale method
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Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran
Faculty of Mechanical Engineering, Malek-Ashtar University of Technology, Tehran, Iran
Online publish date: 2019-01-20
Publish date: 2019-01-18
Submission date: 2018-04-14
Acceptance date: 2018-09-10
Journal of Theoretical and Applied Mechanics 2019;57(1):207–219
Boron nitride nanotubes (BNNTs) possess superior mechanical, thermal and electrical pro- perties and are also suitable for biocomposites. These properties make them a favorable reinforcement for nanocomposites. Since experimental studies on nanocomposites are time- consuming, costly, and require accurate implementation, finite element analysis is used for nanocomposite modeling. In this work, a representative volume element (RVE) of epo- xy/BNNT nanocomposites based on multi-scale modeling is considered. The bonds of BNNT are modeled by 3D beam elements. Also non-linear spring elements are employed to simu- late the van der Waals bonds between the nanotube and matrix based on the Lennard- -Jones potential. Young’s and shear modulus of BNNTs are in ranges of 1.039-1.041TPa and 0.44-0.52TPa, respectively. Three fracture modes (opening, shearing, and tearing) have been simulated and stress intensity factors have been determined for a pure matrix and nanocom- posite by J integral. Numerical results indicate that by incorporation of BNNT in the epoxy matrix, stress intensity factors of three modes decrease. Also, by increasing the chirality of BNNT, crack resistance of shearing and tearing modes are enhanced, and stress inten- sity factor of opening mode reduced. BNNTs bridge the crack surface and prevent crack propagation.
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