Westmoreland Mechanical Testing & Research performs customizable fatigue testing for commercial sectors, such as oil & gas, power generation and aerospace. Our fatigue testing and analysis can prevent service interruption, failure and its consequences including loss of revenue due to fatigue damage.”
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A fatigue test analyzes the behavior of materials while under stress of variable loads. Typically, two loads apply to a material – a specified mass load (i.e., zero) and an alternating load. These loads cycle and measure until the material fails. This failure of a material under fatigue is called fatigue life.
Fatigue degradation (fatigue life) is not limited to metals, and most engineering materials (ceramics, composites, aggregates, etc.) are susceptible to fatigue damage. The strength of materials is a measure of its ability to resist deformation, such as being stretched, bent, etc.
Westmoreland Mechanical Testing & Research’s substantial onsite capabilities allow us to customize each project to your materials and mechanical specifications. Westmoreland Mechanical Testing & Research provides unique customer advantages in fatigue testing, including custom analyzation, superior turnaround time, and an extensive scope of fatigue testing:
These tests conduct load, strain, or position control on servo-hydraulic test equipment at temperatures ranging from Cryogenic to over 1300°C. We have the flexibility and resources to accommodate a wide variety of sample sizes with our machine capacity ranging from 2 to 453,592 kg.
WMT&R is an sector leader in Low Cycle Fatigue (LCF) and High Cycle Fatigue (HCF)Testing for the automotive, aeronautic, motorsport, marine, ministry of defense, manufacturing and power generation sectors.
Low Cycle Fatigue
The low cycle fatigue test run in strain control with the load being a dependent variable. The strain variables that are usually defined by the customer are:
There are three stages to low cycle fatigue testing.
High Cycle Fatigue
Unlike LCF, high cycle fatigue (HCF) tests conduct on specimens in force control. These tests determine the number of cycles to fracture for each specimen, and the data can compile into stress-life (S-N) curves. Nominal stress levels in HCF tests are low — significantly below the material’s yield strength.
Westmoreland Mechanical Testing & Research (WMT&R) provides high cycle fatigue (HCF) services that can help in determining the fatigue strength of a particular material through a variety of tests including but not limited to:
These tests conduct at cryogenic to elevated test temperatures. WMT&R is a one-stop source for low cycle fatigue (LCF) machining, low stress grinding/polishing, and LCF testing ready to meet customers’ ISO/ASTM testing requirements.
Fastener Testing directly affects every one of us on a daily basis. The cars we drive, the planes in which we fly, and the tools we use to do our work all have nuts, bolts, and fasteners. Our fatigue department is involved with a diverse array of fastener tests including fatigue tensile, wedge tensile, double shear, stress rupture, stress durability, microstructure and chemical analysis.
Data reported on this test includes load peaks, strain peaks, hysteresis loops at specific intervals, calculated plastic, and elastic strain, first cycle information, and half-life cycle loop information. In addition to axial tests, we also test materials in bending and rotating modes. Bending fatigues could involve three or four-point flexural tests or cantilever fatigue tests. Rotating beam fatigues are commonly done and are available at room or elevated temperatures. Machining samples from exotic or difficult material are no problem for our in-house machine shop.
Fastener Testing is a critical component of fatigue testing that affects several sectors. From the cars we drive, the planes in which we fly, and the tools we use to do our work all have nuts, bolts, and fasteners of some kind. Our fatigue department is involved with a diverse array of fastener tests such as fatigue tensile, wedge tensile, double shear, stress rupture, stress durability, microstructure and chemical analysis. The laboratories at WMT&R meet all the requirements of the Fastener Quality Act and its Amendments.
Do you need testing on full-size components or assemblies? We have designed and executed fatigue tests for a variety of sectors and applications including:
All of our tests may be run under computer data acquisition to achieve the best performance. Computer data acquisition allows us to obtain data on how a material changes in response to fatigue loading based on your particular sector applications. This data is available to you typically in a tabular data summary and as graphical representations. Due to the nature of fatigue testing, it is necessary to keep you informed as to the status of your testing.
For a Complete List of Fatigue Testing Services, Please Request A Quote or Call +44 (0)1295 261211.
Here is a sample of the standardized fatigue tests that WMT&R is accredited to perform: