Abstract
A continuous interest for an extensive use of sandwich structures in automotive, aerospace and civil infrastructure has been manifested in the last years due to the main advantage of lightweight and energy absorption ability. Based on characteristics of press molding process of honeycomb sandwich structure, a new kind of quasi-square honeycomb sandwich structure is proposed. Following classical unit cell theory and energy method, the mechanical equivalent model of the quasi-honeycomb sandwich structure is established and the corresponding equivalent elastic constant formula is deduced. Taking a sandwich panel in a satellite structure as an example, from the aspect of core characteristics, mechanical properties, equivalent elastic constants of honeycomb sandwich structure, and shear modulus, the differences between square honeycomb and quasi-square-honeycomb were analyzed and studied. The results show that both equivalent elastic modules are approximately equal, but the quasi-square-honeycomb sandwich structure is endowed with higher equivalent shear modulus and lower equivalent body density, thus the total structure mass can be effectively reduced. Simulation verifies the correctness of the proposed mechanical equivalent model of the quasi-square-honeycomb sandwich structure.
Highlights
As the world continues to exploit and consume energy sources, shortages and pollution to the environment and other issues become increasingly prominent
Sandwich is an important part of the sandwich structure, and the appropriate sandwich structure can reduce a large degree of the weight of the sandwich structure
Deducing of Ecx As shown in figure 3, force diagrams of quasi-square-honeycomb unit cells in the X direction, and the equivalent body is the rectangle surrounded by a dotted line
Summary
As the world continues to exploit and consume energy sources, shortages and pollution to the environment and other issues become increasingly prominent. Energy-saving and environment- friendly product meets increasingly high requirements. Lightweight technology came into being, and the sandwich composite is developing rapidly in recent years. Sandwich structure is made of two high strength thin surface layers in which the intermediate sandwich layer fills. Glass, steel, high hardness lightweight materials, while sandwich generally uses the honeycomb structure which is made of foam, aluminum, stainless steel, corrugated steel or other metals. Sandwich materials have become the typical represent of high efficiency, energy-saving composites. With the popularization and application of sandwich material in engineering, more stringent requirements for sandwich material specific stiffness, strength, stability, heat resistance, fatigue resistance, structure, size and other performance indicators were made in engineering applications. Traditional sandwich materials including honeycomb sandwich material has been increasingly unable to meet the design requirements. The proposed new cellular sandwich configuration is of great innovative significance and value in engineering
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