HIGH CYCLE & LOW CYCLE FATIGUE

At CCT, our team of experts specializes in both high cycle fatigue and low cycle fatigue testing, and we are well-equipped with a modern facility to handle critical material fatigue testing programs for various industries. Our testing services are particularly suitable for applications in aerospace (including space, commercial, and military), defense, transportation, energy, and education.

SPECIMEN MACHINING

Our clients highly value our in-house machining center, which spans over 12,000 sq. meters and provides top-quality fatigue test specimens for the testing lab. Our machining services are Nadcap approved and performed using state-of-the-art CNC equipment, including:

· Extraction of specimens

· Finished specimen machining

· Low-stress grinding

· Polishing

HIGH CYCLE AND LOW CYCLE FATIGUE TESTING

CCT's fatigue testing lab has a broad range of expertise to support our customers' needs, whether it's for production testing or during research and development stages for material characterization. Our capabilities include:

· Materials Tested

· Metals

· Fastener 

· Fatigue Test Methods

· ASTM E466

· ASTM E606

· Specimen Types Tested in a wide range of sizes

· Round with threaded ends

· Round with smooth ends

· Button head

· Pin loaded

· Custom designs

EQUIPMENT CAPABILITIES

· Temperatures

· Fatigue testing from -76°F（-60°C） (liquid nitrogen) and 1800°F– Cryogenic fatigue testing is performed in liquid nitrogen

· Load Capacity

· up to 100 kips

FRACTOGRAPHY SERVICES

At CCT, we provide a comprehensive range of SEM services in our full-service Metallography lab to support your fatigue testing program. Our SEM services include not only providing high-quality images but also determining the failure mode and direction. With our in-house capabilities, we can support your program needs efficiently and effectively, all within the same location.

FATIGUE TEST PROCESSES

Fatigue testing is a crucial method for assessing the endurance and reliability of materials subjected to repeated loading and unloading cycles. It can be performed at varying loads, speeds, and temperatures to simulate real-world conditions. The results of these tests are used to predict the lifespan of materials and parts that may be exposed to such conditions. Fatigue testing is commonly employed to assess material properties during the selection or verification process.

Both high-cycle and low-cycle fatigue testing use cyclic loading to evaluate the ability of materials to withstand fluctuating strains and stresses that may lead to cracking or fracture. These tests are essential to ensuring the safety and reliability of products, especially in industries where failure could result in severe injury or damage.

High Cycle Fatigue Test
The high-cycle fatigue test is used to evaluate the fatigue strength of materials under cyclic loading in the elastic regime. It involves applying a large number of constant amplitude direct stress cycles to the test specimen until either the specimen fails or a predetermined number of load cycles is reached without failure. Three common types of high-cycle fatigue tests are Axial Fatigue, Rotating Beam Fatigue, and Fastener Fatigue, each designed to test different types of materials and components.

Low Cycle Fatigue Test

The low-cycle fatigue test is typically performed at a slower pace and with a relatively low number of cycles to failure, typically in the range of a few hundred to a few thousand cycles. This test is characterized by high amplitude, high-frequency plastic strains, and is often conducted at elevated temperatures to simulate real-world conditions. The test involves cyclic loading that results in the development of plastic deformation in the material and can lead to the growth of microstructural defects, such as cracks and voids, which can ultimately lead to failure.

Contact us to discuss your fatigue testing needs with one of our specialists.

SUMMARY OF CAPABILITIES

· 

· Types of Fatigue Testing – high cycle fatigue test and low cycle fatigue test

· Temperature – from -76°F（-60°C） (liquid nitrogen) and 1800°F

· Load Capacity – up to 100 kips

· Materials Tested – metals, , Fastener 

· Specimen Preparation – all specimens can be prepared by CCT machine shop, including flat, round threaded, round smooth, button head and custom designs in a wide range of sizes