Working mode and correct selection of composite sa

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The working mode and correct selection of

core materials for the composite sandwich structure of ships and boats have been used by people for more than 100 years. The earliest application in the composite industry was in the early 1940s, which was used to manufacture mosquito bombers of the Royal Air Force. In the early 1960s, pioneers of advanced technology in the shipbuilding industry began to use balsa core materials and FRP panels to manufacture the deck of sailboats in accordance with the requirements of 2.1, so as to reduce the weight of the hull and increase the stiffness

after years of use, the composite material industry has divided the core materials into three main categories according to their materials:

- structural honeycomb type: (reduce the environmental impact on Nomex aramid honeycomb, aluminum honeycomb)

- natural material type: (balsa light wood, other wood core materials)

- artificial material type: (PVC and other foam plastics)

with the finite element analysis (FEA) The emergence of computer aided design (CAD) and composite engineering design can well prove how the core material "works" and plays a role in the sandwich structure through various data and means

with the continuous development of light, high-speed and high-strength products, the panel materials of sandwich structure and other raw materials have also made considerable progress: a variety of advanced reinforcement materials such as carbon fiber and Kevlar fiber have emerged, and the prices are declining; In the past ten years, various high-performance polyester resins and epoxy resins have also been widely used, and even thermoplastic resins have developed to a certain extent; Various high-quality core materials for sandwich structures have appeared in the raw material market of the composite industry

types of core materials

experienced core material manufacturers have adopted more advanced density control methods to improve product quality while expanding product categories. In order to better understand the selection of core materials to reduce errors and their application fields, we can classify them into the following three categories according to the role of core materials in sandwich structures:

1. unstructured core materials, such as polyurethane foam or paper honeycomb with a density of 32kg/m3, can only provide a certain stiffness, but the load bearing capacity and the use of thermoplastic elastomers in the feet are low. It is a good application example of this kind of core material that paper honeycomb is used to make the interior door of residential area

2. quasi structural core materials, such as low-density PVC foam core materials with shear strength lower than 0.69mpa (density

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