Behavior of Lightweight Smart Sandwich Panels Subjected to Tensile and Bending Loads- An Experimental Study

محورهای موضوعی : composite materials

sameera Khalili ¹ , s. Mohammad Khalili ² , Reza Eslami Farsani ³ , Puneet Mahajan ⁴

1 - Department of Mechanical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
2 - Department of Mechanical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran, Center of Research for Composite and Smart Materials and Structures, Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran, Visiting Professor, Applied Mechanics Department, Indian Institute of Technology, New Delhi,110016, India
3 - Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran
4 - Applied Mechanics Department, Indian Institute of Technology, Delhi-110016, India

تاریخ دریافت : 1400/05/18 تاریخ پذیرش : 1400/10/13 تاریخ انتشار : 1401/03/11

کلید واژه: Shape memory alloy wire, Fiber metal laminate (FML), Sandwich composite panel, Bending test, Tensile test, Pseudoelastic Behavior,

چکیده مقاله :

In this research work, sandwich composite panels made by fiber metal laminate (FML) as the facesheets and polymer foams as the core material are investigated in tensile and bending loads. To change or enhance the behaviour of sandwich panels in tensile and bending loads, shape memory alloy wires with pseudoelastic behaviour are also embedded in between FML layers in facesheets. The shape memory wires are also pre-strained in the FML facesheets of sandwich panels. To study the tensile and flexural properties of sandwich panels with smart FML facesheets three types of sandwich panels are considered and made including panels without shape memory alloy wire, panels with shape memory wires with 0% tensile pre-strain, and panels with shape memory wires with 5% tensile pre-strain for the same cross section. By placing SMA wires in the FML, the strength and stiffness of the smart sandwich specimens are increased significantly in tensile and bending loads. However, the effect of pre-straining the SMA wires is more predominant on stiffness of the specimens. The tensile and flexural toughness or energy absorption is much higher in case of the specimen with 5% pre-strained SMA wires. At the expenses of adding the SMA wires in the sandwich structures, the densities of various specimens are changed by nearly 1% to 5% for various specimens, but a significant increase in mechanical properties such as the strength and particularly the stiffness and toughness were achieved by the present lightweight smart sandwich structures.

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