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This and the next 2 slides are from:
Hesham Tuwair (1), Matthew Hopkins (1), Jeffery Volz (2), Mohamed A. ElGaway (1), Mohaned Mohamed (3), K. Chandrashekhara (3), Victor Birman (4)
(1) Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, USA
(2) School of Civil Engineering and Environmental Science, The University of Oklahoma, USA
(3) Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, USA
(4) Engineering Education Center, Missouri University of Science and Technology, USA
“Evaluation of sandwich panels with various polyurethane foam-cores and ribs”, Composites Part B, Vol. 79, pp 262-276, 2015
ABSTRACT: The objective of this study was to evaluate three potential core alternatives for glass fiber reinforced polymer (GFRP) foam-core sandwich panels. The proposed system could reduce the initial production costs and the manufacturing difficulties while improving the system performance. Three different polyurethane foam configurations were considered for the inner core, and the most suitable system was recommended for further prototyping. These configurations consisted of high-density polyurethane foam (Type 1), a bidirectional gridwork of thin, interconnecting, GFRP webs that is in-filled with low-density polyurethane foam (Type 2), and trapezoidal-shaped, low-density polyurethane foam utilizing GFRP web layers (Type 3). The facings of the three cores consisted of three plies of bidirectional E-glass woven fabric within a compatible polyurethane resin. Several types of small-scale experimental investigations were conducted. The results from this study indicated that the Types 1 and 2 cores were very weak and flexible making their implementation in bridge deck panels less practical. The Type 3 core possessed a higher strength and stiffness than the other two types. Therefore, this type is recommended for the proposed sandwich system to serve as a candidate for further development. Additionally, a finite element model (FEM) was developed using software package ABAQUS for the Type 3 system to further investigate its structural behavior. This model was successfully compared to experimental data indicating its suitability for parametric analysis of panels and their design.
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