R&D Spin Testing

Test Devices has developed the world’s most precise, accurate and efficient test solutions because the company employs experienced and accomplished scientists and engineers. For almost 40 years, Test Devices has developed and advanced the science of centrifugal, vibratory and thermal stress testing and measurement of rotational components – critical solutions engineers need to evaluate integrity and validate component parts.

Optical Strain Measurement

Recent progress in computational capacity and image analysis techniques now facilitates in-situ rotational optical strain measurement. This allows Test Devices’ customers to capture strain data over a full component, such as a turbine disc, while spin testing.

Optical strain measurement can measure and record surface strain at thousands of locations simultaneously. Data can be used on its own or to supplement data generated by traditional in-situ methods such as strain gaging, growth probes and post-test dimensional measurement.
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Burst Testing

Spin burst testing provides customers with an efficient method to validate rotor designs and establish component safety margins. All tests are performed under the safest conditions, in a robust spin chamber installed in a test cell with double-reinforced concrete walls and ceiling. Optional high speed video recording of the burst event can provide invaluable information about the rotor failure mechanism.
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Low Cycle Fatigue Testing

Establishing the fatigue life of a rotating component is critical to establish safe working life criteria. Test Devices offers LCF spin testing services with rapid cycling capability that accelerates fatigue testing programs, providing customers with life-assessment data earlier. Optional crack detection can monitor component integrity in real time, enabling a test to be stopped prior to rotor failure.
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Dynamic Spin® Testing

Test Devices’ Dynamic Spin Testing provides the ability to excite airfoil and disk vibratory modes of fully or partially bladed engine rotor stages. This dynamic testing method enables characterization of the vibratory performance of blade designs to evaluate the effectiveness of damper designs and to assess the high cycle fatigue life of blade and damper systems. Tests can be conducted at ambient temperature or elevated temperatures exceeding 1000°F.
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One-Stop Spin Testing

Test Devices has developed a group of strategic partners – expert and dependable vendors who provide adjunct services to spin testing. This allows customers to produce a single purchase order to Test Devices and benefit from seamless project management, start to finish.
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Data Acquisition & Reporting

All data (including speed, vibration, temperature, and strain) is recorded on digital data-acquisition systems. Customers can be provided with color printouts of the data and electronic copies of the raw data when necessary. Test Devices archives the digital data indefinitely for future customer reference.
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Growth Measurement at Speed

Test Devices can measure elastic and plastic radial growth of components in real time at speed. This technique can verify stress and growth models and determine precise gaps between rotating and stationary components in turbomachinery.
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Strain Survey

Test Devices offers comprehensive strain surveys of complex rotating parts. Strain surveys enable customers to understand assembly stresses and determine the properties of materials (including composites) when exposed to operational strain under realistic conditions.
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Thermal Gradient

During operation, rotating components are exposed to stresses due to thermal gradients that can exceed the centrifugal stresses. Test Devices can provide customers with more relevant test data by performing spin tests with thermal gradients that more closely simulate the complete stress state experienced by components in operation.
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Proof Testing

Proof and Overspeed testing are a mainstay for manufacturers of turbomachinery and other rotating equipment. Essentially, a rotating component is accelerated to a certain speed greater than that ever seen in operation. Overspeed testing is included in the FAA certification of aircraft turbine engines. Test Devices has conducted many such tests.
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Tooling & Arbors

Tooling design and fabrication is a specialty of Test Devices. This is hardware that attaches the test component to the drive of the spin rig. It must withstand the same forces as the test article and deform at speed such that it does not impart unrealistic stresses to the test article. This can involve complex engineering solutions for extreme test conditions and when the test article does not have features for attachment.
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