Three Dimensional Finite Element Analysis of Functionally Graded Radiation Shielding Nanoengineered Sandwich Composites
In recent years, nanotechnology has played an important role in the design of an efficient radiation shielding polymeric composites. It is well known that, high loading of nanomaterials with radiation absorption properties can enhance the radiation attenuation efficiency of shielding structures. However, due to difficulties in dispersion of nanomaterials into polymer matrices, there has been a limitation in higher loading percentages of nanoparticles in the polymer matrix. Therefore, the objective of the present work is to provide a methodology to fabricate and then to characterize the functionally graded radiation shielding structures, which can provide an efficient radiation absorption property along with good structural integrity. Sandwich structures composed of Ultra High Molecular Weight Polyethylene (UHMWPE) fabric as face sheets and functionally graded epoxy nanocomposite as core material were fabricated. A method to fabricate a functionally graded core panel with controllable gradient dispersion of nanoparticles is discussed. In order to optimize the design of functionally graded sandwich composites and to analyze the stress distribution throughout the sandwich composite thickness, a finite element method was used. The sandwich panels were discretized using 3-Dimensional 8 nodded brick elements. Classical laminate analysis in conjunction with simplified micromechanics equations were used to obtain the properties of the face sheets. The presented finite element model would provide insight into deformation and damage mechanics of the functionally graded sandwich composites from the structural point of view.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1129153Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1153
 S. Nambiar, J.T.W. Yeow, Polymer-Composite Materials for Radiation Protection, Appl. Mater. Interfaces. 4 (2012) 5717 − 5726.
 C.-H. Jung, D.-H. Lee, I.-T. Hwang, D.-S. Im, J. Shin, P.-H. Kang, et al., Fabrication and characterization of radiation-resistant LDPE/MWCNT nanocomposites, J. Nucl. Mater. 438 (2013) 41–45.
 Z. Li, S. Nambiar, W. Zheng, J.T.W. Yeow, PDMS/single-walled carbon nanotube composite for proton radiation shielding in space applications, Mater. Lett. 108 (2013) 79–83.
 W.H. Zhong, G. Sui, S. Jana, J. Miller, Cosmic radiation shielding tests for UHMWPE fiber/nano-epoxy composites, Compos. Sci. Technol. 69 (2009) 2093–2097.
 J. Kim, B.-C. Lee, Y.R. Uhm, W.H. Miller, Enhancement of thermal neutron attenuation of nano-B4C, -BN dispersed neutron shielding polymer nanocomposites, J. Nucl. Mater. 453 (2014) 48–53.
 S.A. Thibeault, J.H. Kang, G. Sauti, C. Park, C.C. Fay, G.C. King, Nanomaterials for radiation shielding, MRS Bull. 40 (2015) 836–
 N. Abuali Galehdari, A.D. Kelkar, Effect of neutron radiation on the mechanical and thermophysical properties of nanoengineered polymer composites, J. Mater. Res. 32 (2017) 426–434.
 J.W. Shin, J.-W. Lee, S. Yu, B.K. Baek, J.P. Hong, Y. Seo, et al., Polyethylene/boron-containing composites for radiation shielding, Thermochim. Acta. 585 (2014) 5–9.
 N.A. Galehdari, A.D. Kelkar, Characterization of nanoparticle enhanced multifunctional sandwich composites subjected to space radiation, in: ASME, Phoenix, Arizona, USA, 2016.
 N.A. Galehdari, V. Mani, A.D. Kelkar, Fabrication of Nanoengineered Radiation Shielding Multifunctional Polymeric Sandwich Composites, Int. J. Chem. Mol. Nucl. Mater. Metall. Eng. 10 (2016) 257–260.
 A. Krzyżak, M. Mazur, M. Gajewski, K. Drozd, A. Komorek, P. Przybyłek, Sandwich Structured Composites for Aeronautics: Methods of Manufacturing Affecting Some Mechanical Properties, Int. J. Aerosp. Eng. 2016 (2016).
 J.R. Vinson, Sandwich Structures: Past, Present, and Future, in: O.T. Thomsen, E. Bozhevolnaya, A. Lyckegaard (Eds.), Sandw. Struct. 7 Adv. with Sandw. Struct. Mater. Proc. 7th Int. Conf. Sandw. Struct. Aalborg Univ. Aalborg, Denmark, 29--31 August 2005, Springer Netherlands, Dordrecht, 2005: pp. 3–12.
 A. Vizzini, Lightweight Sandwich Structures. Encyclopedia of Aerospace Engineering, 2010.
 N.M. Chikhradze, F.D.S. Marquis, G.S. Abashidze, L. Kurdadze, Development and Performance of New Gadolinium and Boron Containing Radiation-Absorbing Composite Systems, JOM. 65 (2013) 728–738.
 C.C. Chamis, Simplified composite micromechanics equations for strength, fracture toughness, impact resistance and environmental effects, NASA Tech. Memo. 83696. (1984).