Experimental Characterization and Computational Modeling of Deformation and Damage Sensing through the Piezoresistive Response of Nanocomposite Bonded Surrogate Energetic Materials

Effects of microscale damage evolution on piezoresistive sensing in nanocomposite bonded explosives under dynamic loading via electromechanical peridynamics

“…Structural health monitoring of explosive materials using piezoresistive properties of carbon based nanomaterials is a promising yet relatively unexplored field. It is proposed that using a nanocomposite material as the binder phase of the explosive will result in an inherently piezoresistive nanocomposite bonded explosive (NCBX) material [8][9][10][11][12][13]. Preliminary experimental investigations into the piezoresistive response of NCBX materials under quasistatic loading conditions appear promising [11,12].…”

“…It is proposed that using a nanocomposite material as the binder phase of the explosive will result in an inherently piezoresistive nanocomposite bonded explosive (NCBX) material [8][9][10][11][12][13]. Preliminary experimental investigations into the piezoresistive response of NCBX materials under quasistatic loading conditions appear promising [11,12]. Carbon nanotube (CNT) reinforced nanocomposites can possess extraordinary piezoresistive properties that can be exploited for strain and damage sensing [14][15][16][17][18][18][19][20][21].…”

“…The authors have, in previous work, used peridynamics to model the quasistatic electromechanical response of NCBX materials [58], which has also been explored using cohesive zone finite elements in [10,11], however these simulations were limited to relatively smaller representative volume elements (RVEs), fewer grains and quasistatic response. While the previous work established the validity of the model as proof of concept, the focus of this work is to apply peridynamics to investigate dynamic sensing in NCBX materials, which has not yet been attempted in literature.…”

Computational Micromechanics Investigation of Percolation and Effective Electro-Mechanical Properties of Carbon Nanotube/Polymer Nanocomposites using Stochastically Generated Realizations: Effects of Orientation and Waviness

“…An in-house electro-mechanical 2D finite element code is used to compute the effective electrical and mechanical properties for each realization. This code was previously developed in the Fortran and has been used successfully in several previous works studying CNT/polymer nanocomposite piezoresistivity [ 8 , 25 , 26 , 34 , 36 , 37 , 38 , 39 ] and strain/damage sensing of CNT embedded polymer based energetic materials [ 18 , 40 , 41 , 42 , 43 ].…”

“…A primary motivating factor for the study of electrical percolation is its importance in determining CNT/polymer nanocomposite effective piezoresistivity [ 8 ]. There have been several works to this effect using theoretical, computational or experimental analysis methods [ 5 , 6 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. CNT alignment has been found to have a strong influence on both percolation and the piezoresistive response of polymer/CNT nanocomposites [ 19 ].…”