Sandwich panel

About: Sandwich panel is a research topic. Over the lifetime, 4665 publications have been published within this topic receiving 49812 citations.

Crashworthiness optimization design of honeycomb sandwich panel based on factor screening

Abstract: This paper presents a crashworthiness robust optimization design of aluminum honeycomb sandwich panel with regular hexagonal core cell based on explicit finite element analysis. First, the crashworthiness of honeycomb sandwich panel and the bare honeycomb core are compared with each other in the aspects of specific energy absorption and peak crushing force. The comparative results show that honeycomb sandwich panel can absorb more energy than the bare honeycomb core, though the peak crushing force of honeycomb sandwich panel is larger. Then the factor screening experiments are carried out to find out variables that have significant effects on the crashworthiness of honeycomb sandwich panel. The ultimate purpose of factor screening experiments is to decrease the computational expense by reducing the number of design variables. Finally, the dual response surface method and the crossed array design are employed to formulate the complex robust optimization design problem. The regression expressions of specific energy absorption and peak crushing force are defined as the objective and constraint function respectively in the robust design of crashworthiness optimization. Language: en

Failure analysis of FRP sandwich bus panels by finite element method

Abstract: The weakest part of fiber reinforced polymer composites (FRP) sandwich structures is commonly the interfacial zone between layers. Under service loading, delamination failure will be most likely to initiate from these interfaces. Typical failure analysis for such sandwich structures usually depends on the modeling details of the interface. In this paper, the sandwich panel was modeled as separated layers with appropriate constrains imposed between them. These constrains guaranteed a smooth stress transfer from the skins to the core. The proposed FEM model was applied to simulate the failure behavior of a FRP sandwich panel that is used in bus body. The simulation results were compared with other numerical predictions and the experiment. It was concluded that this model is very efficient computationally for analyzing the failure issues of FRP sandwich structures.

Finite-Element Modeling and Development of Equivalent Properties for FRP Bridge Panels

Abstract: Fiber-reinforced polymer FRP composite materials are increasingly making their way into civil engineering applications. To reduce the self-weight and also achieve the necessary stiffness, sandwich panels are commonly used for FRP bridge decks. However, due to the geometric complexity of the FRP sandwich deck, convenient analysis and design methods for FRP bridge deck have not been developed. The present study aims at developing equivalent properties for a complicated sandwich panel configuration using finite- element modeling techniques. With equivalent properties, the hollowed sandwich panel can be transformed into an equivalent solid orthotropic plate, based on which deflection limits can be evaluated and designed. A procedure for the in-plane axial properties of the sandwich core has first been developed, followed by developing the out-of-plane panel properties for bending behavior of the panel. An application is made in the investigation of the stiffness contribution of wearing surface to the total stiffness of bridges with FRP panels. The wearing surface contribution is not usually accounted for in a typical design of bridges with traditional deck systems.