Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 53 6 2021 08 23 Comparison of penetration process of 2-layer elastomeric composite with thermoset composite using energy absorption equations Comparison of penetration process of 2-layer elastomeric composite with thermoset composite using energy absorption equations 3657 3672 4172 10.22060/mej.2020.18500.6829 FA Seyedeh Samaneh Asemani Faculty of Mechanical Engineering, Tarbiat Modares University, Jalal- e Al-e Ahmad Highway, Tehran, Iran. Gholamhossain Liaghat Faculty of Mechanical Engineering, Tarbiat Modares University, Jalal- e Al-e Ahmad Highway, Tehran, Iran. Hamed Ahmadi تربیت مدرس-مهندسی مکانیک Yavar Anani تربیت مدرس Amin Khodadadi Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran Journal Article 2020 05 27 <strong>The purpose of this paper is to present an analytical model for analyzing the penetration process by a</strong><strong>spherical nose</strong><strong>shape cylindrical </strong><strong>on the kevlar/elastomer and the kevlar/epoxy composites and comparing them with each other using the energy method. To investigate this issue, energy absorption</strong><strong>equations for</strong><strong>linear and</strong><strong>nonlinear materials are analyzed as a criterion for the performance of matrix-reinforced fabric. In this predicted model, the dependence of the ballistic behavior of the first and second layers of the composites on each other during the impact is considered. In this</strong><strong> presented</strong><strong> model, the components of energy absorption include the initial kinetic energy of the projectile, the kinetic energy of the projectile, the kinetic energy of the composite cone ahead of the tip of the projectile, the energies absorbed by primary and secondary yarns, the energies absorbed by the delamination among the layers and the cracking of the matrix, the energy dissipated by plugging of the layers is calculated during impact. The results of this study show a positive effect of elastomer use on thermoset matrix in composite. Also, analytical results are validated with the experimental results of previous studies and the perturbation analysis is done to examine the reason for error.</strong><br />  <strong>The purpose of this paper is to present an analytical model for analyzing the penetration process by a</strong><strong>spherical nose</strong><strong>shape cylindrical </strong><strong>on the kevlar/elastomer and the kevlar/epoxy composites and comparing them with each other using the energy method. To investigate this issue, energy absorption</strong><strong>equations for</strong><strong>linear and</strong><strong>nonlinear materials are analyzed as a criterion for the performance of matrix-reinforced fabric. In this predicted model, the dependence of the ballistic behavior of the first and second layers of the composites on each other during the impact is considered. In this</strong><strong> presented</strong><strong> model, the components of energy absorption include the initial kinetic energy of the projectile, the kinetic energy of the projectile, the kinetic energy of the composite cone ahead of the tip of the projectile, the energies absorbed by primary and secondary yarns, the energies absorbed by the delamination among the layers and the cracking of the matrix, the energy dissipated by plugging of the layers is calculated during impact. The results of this study show a positive effect of elastomer use on thermoset matrix in composite. Also, analytical results are validated with the experimental results of previous studies and the perturbation analysis is done to examine the reason for error.</strong><br />  https://mej.aut.ac.ir/article_4172_8ce1a43fb75e779c6b794ba4d255cf6d.pdf