Characterizing the constitutive response and energy absorption of rigid polymeric foams subjected to intermediate-velocity impact |
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| Institution: | 1. Department of Mechanical Engineering, University of South Carolina, 300 Main St, Columbia, SC 29208, USA;2. Sandia National Laboratories, Livermore, CA 94551-0969, USA;1. Dynamic Photo Mechanics Laboratory, Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, Kingston, RI 02881, United States;2. Naval Undersea Warfare Center (Division Newport), Newport, RI 02841, United States;1. Centre for Nanoscience and Engineering, Indian Institute of Science, Bangalore, India;2. Department of Materials Engineering, Indian Institute of Science, Bangalore, India;3. Department of Aerospace Engineering, Indian Institute of Science, Bangalore, India;1. Politehnica University of Timisoara, Department of Mechanics and Strength of Materials, 1 Mihai Viteazu Avenue, 300 222 Timisoara, Romania;2. National Institute of Research and Development for Electrochemistry and Condensed Matter, Aurel Paunescu Podeanu Street 144, 300 569 Timisoara, Romania;1. Dynamic Photomechanics Laboratory, Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, Kingston, RI 02881, USA;2. Naval Undersea Warfare Center (Division Newport), 1176 Howell St, Newport, RI 02841, USA |
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| Abstract: | As an optimum energy-absorbing material system, polymeric foams are needed to dissipate the kinetic energy of an impact, while maintaining the impact force transferred to the protected object at a low level. Therefore, it is crucial to accurately characterize the load bearing and energy dissipation performance of foams at high strain rate loading conditions. There are certain challenges faced in the accurate measurement of the deformation response of foams due to their low mechanical impedance. In the present work, a non-parametric method is successfully implemented to enable the accurate assessment of the compressive constitutive response of rigid polymeric foams subjected to impact loading conditions. The method is based on stereovision high speed photography in conjunction with 3D digital image correlation, and allows for accurate evaluation of inertia stresses developed within the specimen during deformation time. Full-field distributions of stress, strain and strain rate are used to extract the local constitutive response of the material at any given location along the specimen axis. In addition, the effective energy absorbed by the material is calculated. Finally, results obtained from the proposed non-parametric analysis are compared with data obtained from conventional test procedures. |
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| Keywords: | Polymeric foam Direct impact Digital image correlation Inertia Energy absorption |
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