Test Background
Structural sandwich is a composite structure of plate and shell structure. Its two surfaces are made of very thin plates, with a lighter sandwich layer sandwiched in the middle. The former is called the dashboard and requires high strength; the latter is called the sandwich and requires light weight. General structural interlayers are used for wings, tails, fuselages, rocket bodies, arrowheads, speed brakes, engine nacelles, sound insulation devices, fire partitions, etc.
The water absorption test of sandwich structural materials can determine the water absorption percentage of the sandwich structure or core, the water absorption per unit volume and the mass loss percentage of water-soluble substances. Zhongke Testing Reliability Experiment Center has reliability testing capabilities for various sandwich structures and provides professional water absorption testing services for sandwich structures.
Scope of tests
sandwich structure dashboard include aluminum alloy, stainless steel, titanium alloy and various composite materials.
Sandwich materials include lightweight wood, foam plastic, etc. Metal materials or composite materials can also be used to make corrugated board sandwich or honeycomb sandwich (see honeycomb structure).
Test method
When the sandwich structure or core material comes into contact with water, water molecules diffuse into the sandwich structure or core material and exist in the solid in a physical or chemical manner.
At the same time, some molecules in the sandwich structure or core material will also be dissolved in water. The macroscopic manifestation is an increase or decrease in the mass of the sandwich structure or core material. The amount of mass increase is the inherent property of the material, that is, the water absorption of the material.
Test standard:
GB/T 14207-2008 Test method for water absorption of sandwich structures or cores
GB/T 1446 General principles for performance test methods of fiber reinforced plastics
