Fatigue Testing

Fatigue testing is a vital component for measuring the strength and long-term performance of products. The ATS team of experienced engineers are also capable of designing customized fatigue tests to ensure that the product (or material) will meet the performance requirements needed for real-world conditions. These tests are designed to meet either the applicable ASTM standards or specific client requirements, and to provide fully customized life cycle testing for a multitude of industries. The stresses, loading frequencies, and environmental conditions are evaluated, measured, and analyzed throughout these rigorous tests. Additionally, the S-N curve, or the stress vs. cycles to failure curve, can be generated to provide accurate insights into the potential for real-world failures.

Avoid Fatigue Failure in Mission-Critical Products

Additive Manufacturing (AM) is used to describe the technologies that build 3D objects by adding layer-upon-layer of material, whether the material is plastic or metal. Common to AM technologies is the use of a computer, 3D modeling software (Computer Aided Design or CAD), AM equipment and layering material. Once a CAD sketch is produced, the AM equipment reads in data from the CAD file and lays downs or adds successive layers of material to fabricate a 3D object. AM application is limitless. Early use of AM in the form of Rapid Prototyping focused on preproduction visualization models. More recently, additive manufacturing is used to create mission-critical products within the aerospace, medical, transportation, and automotive industries. Therefore, testing is crucial to verify their performance. The types of materials and components tested will vary depending on the industry. As such, ATS has the capability to conduct thorough fatigue testing on metals, alloys, plastics, polymers, pipes, tubing, medical devices, fasteners, as well as other industrial components. ATS can provide data to help clients avoid the following types of fatigue-related failures:

  • Mechanical
  • Thermo Mechanical
  • Corrosion
  • Fretting
ATS Best Practice Fatigue Testing Methods

ATS engineers are aware that each product, material, or specimen brought into the lab will have a certain level of articulation in service. Depending on the complexity of articulation, as well as other factors, ATS designs customized test programs and fabricates the required fixtures for specific fatigue testing scenarios. Through best practice testing methods, ATS is able to also test for fracture toughness, Crack-Tip Opening Displacement (CTOD), and high-temperature tensile properties.

ATS Machine Capabilities Include:
  • Load Capacity: 2 lbs. to 55,000 lbs.
  • Temperature Range: Ambient to 1000 degrees Celsius
Fracture Toughness

Fracture toughness tests are typically completed within the design stage. These tests are built to determine the exact amount of stress needed to propagate an existing defect (or flaw) within the specific material.

Crack Tip Opening Displacement (CTOD)

CTOD is a type of fracture toughness test. It is used to measure if a material can be used during particularly strenuous working conditions. Specifically, CTOD testing measures plastic deformation at the crack tip, as it appears during stable tearing. It is important to note that this type of test is often used on materials that have high toughness levels, but don’t produce valid KIC with the ASTM E399 standards.

ASTM Specification Capabilites
  • ASTM E466 — Fatigue testing of Metallic Materials
  • ASTM E399 — Linear-Elastic Plane-Strain Fracture Toughness (KIC) of Metallic Materials
  • ASTM E1290 — Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
  • ASTM E606 — Strain-Controlled Fatigue Testing
  • ASTM E1820 — Measurement of Fracture Toughness (JIC-CTOD Measurement)
Learn More About ATS

ATS has a long-standing history of providing a variety of fatigue tests for clients across a multitude of industries. Fatigue tests, combined with other complementary services such as additive manufacturing testing, cleanliness testing, chemical analysis, non-destructive testing, as well as metallurgy and materials testing are designed to provide the data and accurate insights clients need to produce high-quality products. The ATS team of experts is proud to operate a high-quality testing and investigation facility that serves the unique needs of both domestic and international clients.

Exceeding Client Expectations with the ATS Quality Assurance Programs

All ATS team members adhere to the ATS Quality System, which is compliant with ISO 9001 and ISO 17025 standards. Additionally, ATS is accredited by A2LA and PRI (Nadcap), and follow recognized global industry standards and specifications, such as ASTM. The entire ATS team is dedicated to delivering results on time, ensuring that all data is clear and accurate, and exceeding client expectations.

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