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نورس حيدر مصطفى أل سيد حيدر
5/5/2011 10:05:57 AM
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Optimum Design of Symmetric Laminated Reinforced Plate Subjected
to in-Plane Compressive Loading: Buckling Analysis ByN. H. Mostafa, S. O. Waheed, and A. Saady
Abstract: The objective of the current research is to investigate the critical buckling load of fiber reinforced
(FR) plate. The buckling load of an FR plate depends on a variety of variables, including aspect
ratio, thickness of the laminate, fiber orientation of the laminae that make up the laminate, and the
boundary conditions. These variables were related to the buckling load of laminated plates by
analyzing a number of laminated plates using the commercially available ANSYS finite element
software. Among other things, it was found that for the analyzed FR laminated plates simply
supported on all edges, the optimal fiber orientation of the mat layers was 45 degrees for all
thicknesses with aspect ratios of 1.0 and 2.0 , but that was not the case for the other boundary
conditions considered. In the case of simple-simple-fixed-fixed, the +30/-30 orientation produce
the highest buckling load for all aspect ratios cases considered; while for free-fixed-fixed-fixed the
+15/-15 did in the majority of the cases. For all cases of the boundary conditions, critical buckling
loads increase with increasing aspect ratio and of course with increasing plate thickness.
Introduction
Over the last few decades, the critical buckling load of rectangular plates has been very extensively
studied for a wide range of loading cases and boundary conditions (Huyton and York 2001). By
contrast, far fewer studies have considered the buckling behavior of fiber reinforced laminated plate
structures, despite the practical importance of laminated plates in aircraft wing and fuselage panels. Fiber reinforced has been used for many years in the aerospace and automotive industries for their advantages such as lightweight, corrosion resistance, low thermal and electrical conductivity, high strength to weight and stiffness to weight ratios, and the ability to vary the properties over a wide range of values. Although various materials can be used as fiber reinforcement, the most common used are glass, carbon, and organic fibers (Barbero, 1999). The type of fiber used depends on the application, the properties desired, and the cost. Glass is the most common type of fiber used because of its low cost. The laminated plates are subjected to any combination of in plane, out of plane and shear loads during application. Due to the geometry of these structures, buckling is one of the most important failure criteria.
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وصف الــ Tags لهذا الموضوع
- buckling, fiiber reinforced, symmetric laminate plate, ANSYS
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