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How to analyze the failure phenomenon of composite materials

Date:2023-06-02 16:51:28 Views:232

Composite materials are one of the most widely used engineering materials in the field of modern engineering, with advantages such as high strength, light weight, corrosion resistance, and wear resistance. But there are also some problems during use, such as the failure phenomenon of composite materials. In order to identify and solve failure problems, it is necessary to analyze the failure phenomena of composite materials. If you are interested in the upcoming content, please continue reading the following text, hoping it can be helpful to you.

1、 Failure type classification

Before analyzing the failure phenomenon of composite materials, the failure types should be classified. There are three main types of failures:

1. Ductility failure: Ductility failure is usually the deformation of composite materials under load. When stress persists, the structure ruptures due to fatigue or overload.

2. Creep failure: Creep failure is a reversible proportional deformation caused by prolonged sustained stress. Due to different conditions, creep damage may be concentrated inside or outside the composite material, such as interlayer shear and fiber detachment.

3. Stable failure: Stable failure refers to the degradation of material properties caused by chemical changes and long-term environmental conditions, such as aging and corrosion.


2、 Failure analysis methods

1. Appearance analysis method: This is one of the most commonly used failure analysis methods, which analyzes the failure phenomenon of composite materials through various means such as naked eye observation, microscope observation, and fracture analysis. For example, if obvious cracks or wear are found on the outer surface, it indicates that the material is at risk of fatigue failure. If detachment is found on the surface of the material, it may be due to weakened bonding force between the adhesive layer and the substrate, leading to bonding failure.

2. Thermal analysis method: this method usually includes coefficient of thermal expansion, thermal conductivity and other tests. By testing, the thermal expansion and thermal conductivity of composite materials can be evaluated to determine their stability.

3. Mechanical testing method: This method evaluates the mechanical strength of composite materials by measuring their tensile strength, compressive strength, bending strength, and other properties using testing machines and other testing instruments.

4. Structural analysis method: Structural analysis usually studies the performance of composite material structures through finite element simulation calculations and experimental testing. Through simulation calculations, the stress and deformation of composite materials under specific loads can be simulated, thereby evaluating the structural strength of composite materials. In terms of experimental testing, modern testing equipment such as 3D measuring instruments and infrared thermal imagers are also widely used in such analyses.

3、 Failure handling methods

Repair processing: Repair processing refers to repairing or replacing composite materials to restore their functional use. For the occurrence of fatigue cracks, thermal failure, corrosion, etc., welding, filling, coating, and other methods can be used for treatment.

Replacement treatment: If the composite material is severely damaged or fails, a new composite material can be used to solve the problem. When replacing, it is necessary to pay attention to selecting materials with the same material and structure as the original components to ensure that the performance after replacement meets the requirements.

Repair treatment: Repair treatment refers to the process of repairing the failed parts of a composite material to meet its usage requirements again. Repair treatment can be carried out through methods such as polishing, painting, coating, etc.

Process improvement: In response to the failure phenomenon of composite materials, the probability of failure can also be reduced by improving manufacturing processes or material formulations. For example, high-temperature treatment, coating, and other methods can be used in the manufacturing process to enhance the corrosion resistance of composite materials.

Composite material failure analysis is a comprehensive issue that requires the comprehensive application of various methods mentioned above to comprehensively and deeply understand the root causes of material failure. Chuangxin Testing is a professional testing institution for electronic components. Currently, it mainly provides integrated circuit testing services such as capacitors, resistors, connectors, MCU, CPLD, FPGA, DSP, etc. Specializing in functional testing of electronic components, appearance testing of incoming electronic components, anatomical testing of electronic components, acetone testing, X-ray scanning testing of electronic components, and ROHS composition analysis testing. Welcome to call, we will be happy to serve you!