Enhancement of Defensive Performance of GO/MoS۲/PVB Nanocomposite Against ۷.۶۲ mm Caliber

Background: The ۷.۶۲×۵۱ mm caliber with a velocity of ۸۵۰ m/s and energy of ۳۵۰۰ J is one of the main challenges in personal protective systems. Polymer nanocomposites reinforced with two-dimensional nanoplatelets, due to their high strength-to-weight ratio, are suitable candidates for stopping this caliber [۱]. Graphene oxide (GO) with a strength of ۱۳۰ GPa and modulus of ۱ TPa, and molybdenum disulfide (MoS۲) with a modulus of ۲۷۰ GPa, in combination with polyvinyl butyral (PVB) create synergistic properties [۸, ۲۵, ۲۶]. Research Methodology: The GO/MoS۲/PVB nanocomposite with a weight ratio of ۱:۱ and a concentration of ۱ wt% was modeled using explicit numerical analysis in Abaqus/Explicit [۷]. The Johnson-Cook material model was employed for strain-rate-dependent behavior, and the Cohesive Zone Model (CZM) was used for the nanoplatelet-matrix interface [۶, ۳۰]. Material properties were extracted from authoritative sources. Findings: The tensile strength of the GMP-۱ sample (۰.۵% GO and ۰.۵% MoS۲) reached ۹۴.۵ MPa and the Young's modulus reached ۳.۲ GPa, which are ۸۷% and ۱۱۳% higher than those of pure PVB, respectively [۱]. The sample with a thickness of ۱۵ mm and an areal density of ۴.۷ kg/m² stopped the ۷.۶۲×۵۱ mm cartridge (BFS = ۲۲.۳ mm < allowable limit of ۴۴ mm) [۹]. A strength-to-weight ratio of ۲۰.۱ MPa/kg/m² was obtained, which is ۸۵% lighter than steel armor [۲, ۳]. Conclusion: The GO/MoS۲/PVB nanocomposite is a suitable candidate for lightweight defense systems. The simulation results are in good agreement with the experimental data from references [۱] and [۶].

کلیدواژه ها:

Nanocomposite ، Graphene oxide ، Molybdenum disulfide ، PVB ، Explicit numerical analysis ، Ballistic armor