Fatigue Testing

Fatigue testing utilizes cyclic loading to predict the life of parts and raw stock under fluctuating loads. Determining fatigue life can support R&D efforts for new materials as well as prevent failures and recalls when used to ensure material properties. 

Understanding fatigue life is critical in a wide range of industries such as Aerospace, Medical Device and Oil & Gas to ensure safety and reliability as well as determine the longevity of a part or product.

IMR offers a variety of services to help you evaluate your materials. We have various frames designed to handle a wide range of loads and samples. We can perform testing on:

  • Metals

  • Coatings (coating shear)

  • Polymers

  • Composites (fiber-reinforced, ceramic-matrix)

  • Nonmetallic/Metallic hybrid materials

  • Finished products


Fatigue testing in a full array of temperatures including cryogenic and high-temperature and cyclic variablesFor the most accurate fatigue testing results, IMR Test Labs can replicate a full array of operating temps your materials could be exposed to. Whether it’s cryogenic (to -320°F), or very high temperature (to 1800°F), our skilled lab personnel can accomodate your unique testing requirements.  Our technologically advanced testing frames are built to handle wide variations of LCF, HCF and temperature extremes to deliver the data AND knowledge you require.  

Are you looking for an overflow lab?  Is your current lab no longer providing the results or customer service you've come to expect? Do you have a special project you need R&D support for? Count on IMR to provide you thorough, accurate materials testing.

Not only do we offer accredited fatigue testing, but we can also provide insightful, informative analysis and reporting after testing.  Our metallurgical engineering group is well-versed in fractography and failure modes. With a full microscopy lab (light, optical, SEM) and the support of our chemistry, mechanical and other groups, we can get you the answers you need, all in one place, from one team.

Read about the expansion of our Fatigue Testing Services to include High Temperature (up to 1800°F) testing here.

Learn More About Fatigue Testing

Fatigue Testing Services

Axial Fatigue (-320°F  to 1800ºF)
    - Displacement Controlled
    - Strain Controlled
    - Load Controlled
Coating Shear Fatigue 
Cryogenic Fatigue Testing (-320°F)

Fracture Mechanics

Fracture Toughness (K1C)
High Temperature (up to 1800°F)
High Cycle Fatigue 
Low Cycle Fatigue 
Rotating Beam Fatigue (up to 1000ºF)
Thermal Spray Coating Fatigue
Three and Four Point Bend Fatigue

Fatigue Testing Case Studies

Coatings Fatigue and S-N Curve Comparison

 Coatings Fatigue and S-N Curve Comparison

IMR has performed coating qualification fatigue testing for numerous customers, primarily those in the aerospace and defense industries. We have been responsible for high-profile projects spanning hundreds of hours of testing and dozens of samples.

For this client, we ran a fatigue life comparison with an S-n curve.  The client applied several varieties of thermal spray coatings to a 300M steel substrate and submitted it to run under various loads upwards of 200ksi until failure or runout at 1,000,000 cycles.  After running 60 samples on our large capacity frame (±55kip), we helped the client determine that the coating qualified the fatigue life testing, and was usable in the field.

 Coatings Fatigue and S-N Curve Comparison

We also provided the customer with the S-n curves after testing, which were generated from Excel using data from our MTS test suite.

Special wedges with threads were designed and created for these coating qualifications.  The wedges were machined, heat treated, and then polished to a specific finish.  We now have the ability to adapt to any thread size a customer may need on our largest frame.  

(please note examplar curve is for 2024 aluminum material)

Specifications Offered

IMR's fatigue testing group is accredited for numerous specifications and has performed testing to many individual test plans.  Here are a few of the more common methods we've performed.

Designation    Title
ASTM E399   Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness KIC of Metallic materials
ASTM E466   Standard Practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials
ASTM E468   Standard Practice for Standard Practice for Presentation of Constant Amplitude Fatigue Test Results for Metallic Materials
ASTM E606   Standard Practice for Strain-Controlled Fatigue 
ASTM F1160   Standard Test Method for Shear and Bending Fatigue Testing of Calcium Phosphate and Metallic Medical Coatings
ASTM E1820   Standard Test Method for Measurement of Fracture Toughness
ASTM E647   Standard Test Method for Measurement of Fatigue Crack Growth Rates
ASTM B645   Standard Practice for Linear-Elastic-Plane-Strain Fracture Toughness Testing of Aluminum Alloys
ISO 1143   Metallic materials -- Rotating bar bending fatigue testing
JIS Z 2274   Method of rotating bending fatigue testing of metals
MPP-008   Rotating Beam Fatigue 

Fatigue Frames & Capabilities


55 Kip Fatigue Frame Specifications:

Load: ~550 to 55,000 lbs
Frequency: 1 to 60 hertz
Temperature: Some temperature capabilities depending on sample geometry and test plan
Sample Geometry:T-slot table allows for special fixturing or unique samples
Load, Displacement or Strain controlled
For strain controlled fatigue testing, IMR has extensometers in gauge lengths of 1/2", 3/4", 1" or 2"

22 Kip Fatigue Frame Specifications:

Load: ~100 to 22,000 lbs
Frequency: <1 to 60 hertz

20 Kip Fatigue Frame Specifications:

Load: ~200 to 20,000 lbs
Frequency: <1 to 60 hertz
Temperature: Some temperature capabilities depending on sample geometry and test plan
Sample Geometry: Extra tall frame capable of accomodating very long samples.
Load, Displacement or Strain controlled
For strain controlled fatigue testing, IMR has extensometers in gauge lengths of 1/2", 3/4", 1" or 2"

10 Kip Fatigue Frame Specifications:

Load: ~100 to 10,000 lbs
Frequency: <1 to 60 hertz

ROTATING BEAM FATIGUE Testing/Bending Fatigue

IMR Test Labs - Portland offers rotating beam fatigue testing on 9 cantilever type RBF frames.

RBF Frame Specifications: 

Frequency: ~6,000 rpm (100 Hertz) 
Methods: S-N Curve, Up-Down (staircase), Customer Specification 
Elevated Temperature Available


DynaMight Fatigue Frame Specifications:

Load: 200 lbs maximum
Frequency: <1 to 5 hertz