1. Test items

Mechanical properties:

Tensile strength testing is the key point, and the maximum tensile force that carbon fiber can withstand must be accurately measured. Because in practical applications such as aerospace and automobile manufacturing, components must withstand huge external forces. If the tensile strength does not meet the standard, it is easy to cause the risk of structural failure.

Bending strength is also critical. Evaluate the performance of carbon fiber under bending. For example, aircraft wings and golf clubs will be bent and stressed when in use to ensure that they can meet the use requirements.

Chemical composition: Detect the carbon content in carbon fiber. Purity directly affects performance. High-purity carbon fiber often has better strength and high temperature resistance. At the same time, it is necessary to check the content of impurity elements, such as metal impurities. Excessive presence may affect the electrical and thermal properties of carbon fiber.

Dimensional accuracy: Carbon fiber products have strict dimensional specifications. It is necessary to measure the diameter and length of the fiber tow, as well as the thickness and flatness of the composite material after molding. Excessive deviation will affect the assembly accuracy. In the field of aerospace, even small dimensional errors may cause the components to fail to install normally.

High temperature resistance: simulate high temperature environment, observe the changes in mechanical properties and weight loss of carbon fiber at specific high temperature, ensure that it can work stably under high temperature conditions such as spacecraft, and no softening, deformation and other problems will occur.

2. Testing method

Laboratory instrument testing:

Universal material testing machine is used to measure mechanical properties. By accurately loading tension and pressure, the stress-strain curve of carbon fiber until it breaks is recorded to obtain tensile and bending strength data.

Element analyzers, spectrometers, etc. detect chemical composition and can accurately determine the content of carbon and impurity elements.

Environmental simulation test: High temperature furnace simulates high temperature environment, cooperates with mechanical performance testing equipment, and monitors the changes in various performance parameters of carbon fiber at high temperature in real time.

3. Testing standards

International standards: such as ASTM series standards, provide general specifications for the global carbon fiber industry, covering mechanical properties, chemical composition and other indicators, to ensure product quality consistency for cross-border applications and trade.

Industry and enterprise standards: Aerospace, automotive and other industries have formulated stricter standards based on their own special needs. For example, the aviation field has extremely high requirements for the fatigue performance of carbon fiber. In order to highlight the competitiveness of products, enterprises will also improve their standards in terms of dimensional accuracy.

4. Significance of testing

Ensure the quality of end products: Strict testing ensures the quality of carbon fiber used in aircraft, automobiles and other products, avoids safety accidents caused by material defects, and improves the overall performance and reliability of products.

Promote industry development: Unified and standardized testing prompts companies to improve production processes, improve product quality, eliminate inferior products, and help the carbon fiber industry develop steadily towards higher performance and wider application.