Fatigue testing machines are mainly used to measure and evaluate the fatigue behavior of materials and structural components under repeated or cyclic loads. Specifically, fatigue testing machines can be used to perform the following types of tests:
1.Fatigue strength testing: Determines the number of cycles a material or component can withstand at a certain level of stress, as well as the maximum load-bearing capacity at a specific number of cycles.
2.Fatigue life testing: Determines how many cycles a material or component can withstand before failure at a given stress amplitude, which is often used to plot the S-N curve (stress-life curve).
3.Fracture mechanics test: Evaluate the crack growth rate, including the crack initiation period, the stable growth period and the rapid expansion (fracture) period, and determine the fracture toughness of the material.
4.Fatigue crack propagation test: Evaluate the crack propagation rate, including the crack initiation period, the stable propagation period, and the rapid propagation (fracture) period, as well as determine the fracture toughness of the material.
5.High Cycle Fatigue (HCF) Testing: Tests the fatigue performance of materials with fewer cycles at high stress levels.
6.Low Cycle Fatigue (LCF) Testing: Suitable for cycles at lower frequencies and higher strain levels, it is often used to evaluate the performance of engineering structures under cyclic loads with large deformations.
7.Thermal fatigue testing: Simulates cyclic loading conditions under thermal expansion and contraction caused by temperature changes.
8.Multiaxial fatigue testing: Loads in different directions are applied simultaneously to simulate more complex real-world conditions.
The data and information that can be obtained through fatigue testing includes, but is not limited to, the fatigue limit or durability limit of the material. The number of cycles when fatigue breaks. Fatigue crack propagation behavior of a material or component. The fatigue failure mode of a material or component under specific conditions. Used to design and improve materials and structural components.
Fatigue testing is of great significance for the design of safe and reliable engineering structures and products, service life, and maintenance plans.