What is a four-point bending fatigue testing machine?

What is a four-point bending fatigue testing machine?

In the fields of industrial manufacturing, materials science, and engineering, the four-point bending fatigue testing machine is an important test equipment used to evaluate the fatigue performance of materials under repeated bending loads. This article will introduce in detail the definition, working principle, application fields and related technical parameters of the four-point bending fatigue testing machine.

1. Definition of four-point bending fatigue testing machine

The four-point bending fatigue testing machine is a device specially used to test the fatigue life and performance of materials under four-point bending load. It evaluates durability and reliability by simulating the repeated bending stresses a material is subjected to in actual use. This kind of testing machine is widely used in fatigue performance research of metals, composite materials, ceramics and other materials.

2. Working principle of four-point bending fatigue testing machine

The working principle of the four-point bending fatigue testing machine is to apply bending load to the specimen through two upper indenter heads and two lower support heads. The positions of the upper pressure head and the lower support head are fixed, forming four contact points, so it is called "four-point bending". During the test, the specimen gradually developed fatigue cracks under repeated bending stress until it broke. By recording the fracture cycle and stress changes of the specimen, the fatigue properties of the material can be evaluated.

3. Application fields of four-point bending fatigue testing machine

Four-point bending fatigue testing machine is widely used in the following fields:

4. Technical parameters of four-point bending fatigue testing machine

The technical parameters of four-point bending fatigue testing machines vary depending on the model and manufacturer. The following are common parameter ranges:

5. Advantages of four-point bending fatigue testing machine

The four-point bending fatigue testing machine has the following advantages:

1.High precision: Able to accurately control load and frequency to ensure the reliability of test results.

2.Multifunctional: Supports multiple control methods and sample sizes, suitable for testing needs of different materials.

3.Automation: Equipped with data collection and analysis system to realize automation and intelligence of the testing process.

4.security: Equipped with overload protection and emergency shutdown functions to ensure the safety of operators.

6. Summary

The four-point bending fatigue testing machine is an important tool for material fatigue performance testing and is widely used in aerospace, automobile manufacturing, construction engineering and other fields. By precisely controlling load and frequency, it can evaluate the durability of materials under repeated bending stress, providing reliable data support for material development and quality control. With the advancement of technology, the functions and application range of four-point bending fatigue testing machines will be further expanded, providing more possibilities for industrial development.