Fatigue is a process of decreasing the strength properties of a material subjected to long-term cyclic loads, which in turn leads to the destruction of the structure. Two characteristic phases of the fatigue process are the initiation of cracks and their development and destruction of the object. Fatigue strength is the highest stress amplitude at which the material does not fail.

Fatigue tests – testing capabilities

For fatigue tests, we use 30 test stands, the load range of which is in the range from 500 N to 250 kN. We test samples of various geometry and dimensions, made of both light alloys and durable alloys for aircrafts.

The tests performed in the temperature range from -180°C to 1500°C fully cover the demand on the global market of fatigue tests, especially for aircraft alloys. These capabilities result from specially designed sample gripping systems, temperature controllers and properly selected furnaces. Cooling of extensometers for strain measurements is carried out with air or water.

The full range of fatigue tests performed includes:

• low cycle force (LCF) controlled, 
• high cycle force (HCF) controlled, 
• strain controlled low cycle force (SCLCF), 
• fracture mechanics (KIc, da/dN), 

All tests combined with the capability of their performance at temperatures up to 1500°C place the Institute at the forefront of testing centers in the world.

We perform tests in accordance with the accepted standards, including:

• ASTM,
• E606, 
• ASTM,
• E466, 
• ASTM E399, 
• ASTM E647 da/dN and according to customer specifications.

In order to meet the customers’ requirements, all measuring devices and instruments are calibrated in accordance with the accepted standards, including:

• ASTM E4, 
• ASTM E467, 
• ASTM E83, 
• ASTM E1012, 
• ASTM E220, 
• ASTM E574. 

The laboratories and staff of the Institute have numerous certificates and diplomas confirming the highest competences.

Fatigue tests – equipment

We have many machines and devices from renowned manufacturers:

• 11 (eleven) MTS 100 kN fatigue testing machines,
• 6 (six) INSTRON 100 kN fatigue testing machines,
• 4 (four) MTS 250 kN fatigue testing machines,
• 2 (four) MTS 25 kN fatigue testing machines,
• 6 (six) MTS 50 kN fatigue testing machines.

We offer the ability to create your own complex programs that allow you to simulate the real course of loads of the tested element in an unlimited way. We carry out tests at a constant ambient temperature thanks to specially designed air conditioning installed in the room where the research stands are located. We have our own voltage support system that allows us to continuously conduct long-term tests without the risk of losing test data.

Fatigue tests – standards and certificates

We have obtained the GE S-400 certificate for performing tests in the field of high and low cycle fatigue tests (HCF and LCF), which is a confirmation of meeting the high expectations of our Customers in this area. The certificate received is a supplement to the confirmation of competence in the field of static tensile tests at room temperature and elevated temperatures, as well as creep tests. 

We also have a high potential in the field of fatigue testing of composite materials. The tests are performed using state-of-art testing equipment in accordance with international standards. We have PCA and NADCAP accreditation in the field of testing non-metallic materials. Fatigue tests of composite materials are performed at temperatures from -130°C to 315°C, with a maximum load of 250 kN.