Journal of Science and Technology of Composites

Journal of Science and Technology of Composites

Effect of nano clay addition to energy absorption capacity of steel-polyurea bi-layer

Document Type : Research Paper

Authors
Ahmad Bidi
Gholamhossein Liaghat
Gholamhossein Rahimi
Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
Abstract
The impact behavior of steel – polyurea bi-layer panel is studied and the effect of nano clay addition to polyurea is investigated. Experimental and numerical analysis is used. Polymeric and nano polymeric bi-layer specimens are fabricated and Simple tension test and drop impact test are carried out. Impactor acceleration for each test is recorded and compared with numerical one. Experimental results show that adding nano clay to polyurea will improve impact energy absorption and plastic deformation of bi-layer panel. nano clay with 1% weighting is added to soft part of the polyurea i.e. polyamine. Mechanical mixing and ultrasonic dispersion system is used for good dispersion of nano particles before mixing in polyamine. Experimental results show that elastic modulus is increased about 60% and elongation at break is decreased about 7% with nano clay addition. Also nano clay effects on bi-layer panel is studied with drop impact test and the results is verified with numerical analysis. It is shown that adding nano clay to polyurea as a reinforcement filler has increased the impact energy absorption about 3% and has decreased the maximum plastic deformation about
Keywords
Nano clay
Polyurea
Drop impact test
energy absorption

Subjects

 
[1]    Chongdu, C. and Guiping, Z., “Dynamic Response and Damage of Composite Shell under Impact,” KSME International, Vol. 13, No. 9, pp. 956-608, 1999.
[2]    Damodar, R. A. and James, H. S., “Effect of Curvature on the Impact Damage Characteristic and Residual Strength of Composite Plates,”Nasa Langley Research Center. AIAA Paper No. 98 -1881.
[3]    McShane, G.J. Stewart, C. Aronson, M.T. Wadley, H. N. G. Fleck, B. N. and Deshpande, V.S., “Dynamic Rupture of Polymer– Metal Bilayer Plates,” International Journal of Solids and Structures, Vol.45, No. 16. pp. 4407-4426, 2008.
[4]    Irshidat, M. Al-Ostaz, A. and Cheng, A. H. D., “Predicting the Response of Polyurea Coated High Hard Steel to Ballistic Impact by Fragment Simulating projectiles,” Submitted to Computational Mechanics, 2008.
[5]    Amini, M.R. Isaacs, J. and Nasser, S., “Investigation of Effect of Polyurea on Response of Steel Plates to Impulsive Loads in Direct Pressure Pulse Experiments,” Mechanics of Materials, Vol. 42, pp. 628-639, 2010.
[6]    Pole, M. H., and Liaghat, Gh., “Experimental and Analytical Penetration Analysis in Nano Composites”, In Persian, PhD Thesis Mechanical Engineering, TMU. Tehran, Iran 2012.
[7]    Isik, I. Yilmazer, U. and Bayram, G., “Impact modified epoxy/montmorillonite nanocomposites, synthesis and characterization,” Polymer, Vol. 44, No. 20,  pp. 25-44, 2003.
[8]    GunaSingh, C. Soundararajanand, S. and Palanivelu, K., “Studies on Mechanical, Thermal properties and Characterization of Nanocomposites of Nylon-6 –Thermoplastics Poly Urethane Rubber [TPUR] blend,” Journal of Applied Chemistry, Vol. 4, pp. 65-75, 2013.
[9]     AUTODYN, EKM, Engineering Knowledge Manager, http://orange.engr.ucdavis.edu, available in 24 December 2015.
[10]  Hallquist, O., Ls-Dyna Theory Manual, Sec. 18.19, 2006.
[11]  LS-DYNA keyword user’s manual, Vol. 1 version 960, Livermore Software Technology Corporation, Sec. 1 pp. 36, 2001.
 
 
 
Journal of Science and Technology of Composites
Volume 3, Issue 2
Summer 2016
Pages 157-164