Introduction to Criteria for Judging the Failure Forms of Composite Materials

Date：2023-05-31 15:17:28 Views：577

Composite materials, as a high-performance material, also face various challenges during use, such as fatigue failure, corrosion failure, crack failure, and so on. In order to better use and manage composite materials, it is necessary to judge and evaluate these failure modes. This article will introduce the criteria for determining the failure forms of composite materials, including how to determine the failure of composite materials, the causes of failure, and how to evaluate the impact of failure.

1. Judgment criteria for failure forms of composite materials

There are various forms of failure in composite materials, including fatigue failure, corrosion failure, crack failure, and so on. In order to accurately determine the failure of composite materials, some judgment criteria need to be followed.

a. Fatigue failure

Fatigue failure is one of the most common forms of failure in composite materials. Generally speaking, fatigue failure is caused by the fatigue life of a material reaching its limit. The criteria for determining fatigue failure include:

The strength of the material is lower than the design value;

The wear or corrosion of the material reaches a certain degree;

The material exhibits obvious plastic deformation or cracks.

b. Corrosion failure

Corrosion failure is caused by environmental factors such as acid, alkali, salt, etc., which cause damage to the internal structure of composite materials. The criteria for determining corrosion failure include:

The corrosion resistance of the material is lower than the design requirements;

The appearance of the material exhibits obvious corrosion phenomena, such as spots, discoloration, etc;

The strength and stiffness of the material decrease.

c. Crack failure

Crack failure is another common form of failure in composite materials. Generally speaking, crack failure is caused by internal defects or external factors in the material. The criteria for determining crack failure include:

Obvious cracks or cracks appear on the surface of the material;

The strength and stiffness of the material decrease;

The material exhibits fatigue cracks.

2. Causes of composite material failure

The failure of composite materials is often the result of a combination of multiple factors. The following are some common causes of composite material failure:

a. Fatigue failure

Fatigue failure may be caused by a shorter fatigue life of the material, a decrease in its corrosion resistance, or external factors affecting the material.

b. Corrosion failure

Corrosion failure may be caused by environmental factors such as acid, alkali, salt, etc., leading to damage to the internal structure of the material.

c. Crack failure

Crack failure may be caused by internal defects or external factors of materials, such as inconsistent coefficient of thermal expansion, mechanical vibration, etc.

3. Impact of composite material failure assessment

Once it is determined that the composite material has failed, it is necessary to evaluate the impact of the failure in order to take corresponding measures. Generally speaking, failure assessment includes the following aspects:

a. Affects the strength and stiffness of the structure;

b. Affects the durability and reliability of the structure;

c. Affects the corrosion resistance of the structure.

Through the above evaluation, the impact of composite material failure on the structure can be determined, and corresponding measures can be taken for repair or replacement to ensure the safety and reliability of the structure.

After reading this article, have you gained more understanding of the failure forms of composite materials? That's all for today's content. If you find the content helpful, please follow Chuangxin Testing. We will provide you with more industry information!