Fatigue Testing

Fatigue refers to the process of crack initiation and propagation until a small piece falls off or breaks under the action of alternating stress and alternating strain. Fatigue failure is a phenomenon in which components lose their normal working performance due to fatigue damage. Understanding the fatigue properties of materials is the key to R&D, product safety and material verification. As a professional reliability testing organization, T, C&A Lab can complete fatigue tests of various products in accordance with ISO, ASTM and other standards.

The fatigue tests we provide include but are not limited to:

• High Cycle Fatigue Test (N_f>10⁵)

High cycle fatigue refers to the fatigue process in which the fatigue fracture life of small specimens is ≥10⁵ cycles in the variable load (stress) test. High-cycle fatigue tests are carried out under controlled stress conditions, and the relationship between the maximum stress σ_max or stress amplitude σ_α of the material and the cyclic fracture life N (S-N curve) and the fatigue limit σ_R are used as the characteristics and indicators of fatigue resistance. They are the most important material mechanical performance data in the selection, process and safety design of power equipment or similar mechanical components.

• Low Cycle Fatigue Test (N_f{10²~10⁵})

Low cycle fatigue is also called conditional fatigue limit. The stress level acting on parts and components is high, and the number of failure cycles is generally less than 10³ ~ 10⁴, such as the fatigue of pressure vessels and gas turbine parts.

• Others

In addition, we also provide other fatigue testing services, including room temperature fatigue test, low temperature fatigue test, high temperature fatigue test, thermal fatigue test, corrosion fatigue test, contact fatigue test, fretting wear fatigue test and so on.

Our test methods include but are not limited to：

• Fatigue crack growth rate test

The fatigue crack growth rate da/dN, is the change rate of crack length “a” with cycle times “N” under fatigue load, which reflects the speed of crack growth. da/dN plays an important role in estimating the fatigue life of cracked bodies.

• S-N curve determination

S-N curve, also known as the stress life curve, is the relationship curve between the stress level applied during the fatigue process and the number of cycles to failure. S stands for stress level, which can be large stress and stress amplitude in the process of cycle, and N represents the life, which can be linear life or logarithmic life. The S-N curve was first proposed and used by the German Wohler, so it is also called the Wohler curve. Generally speaking, the N of the S-N curve has a 50% guarantee rate, which is the so-called median fatigue life.

• Rotating bar bending fatigue testing

Rotating bar bending fatigue test, also known as Nakamura test, is a method to determine the inherent quality of materials. Its main purpose is to evaluate the cleanliness of materials. It can also be used to draw S-N curve of materials and determine the fatigue limit of materials.

Standards we test to

In addition, the experts in our Fatigue Testing Laboratory also provide a variety of custom tests as you need. Let's discuss the customized service with our experts for free.

Instruments and data

Note: this service is for Research Use Only and Not intended for clinical use.

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