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Stress Rupture and Creep Testing Lab

Given enough time and thermal stress, materials can sometimes fail below maximum ratings. Deformation below yield-strength loading is known as creep and, if unchecked, will progress to failure via rupture. Given the subtle nature of deformation at load conditions below ideal maximums, creep seriously threatens device integrity and user safety. A stress rupture and creep testing lab can evaluate material loading to better characterize field performance to the benefit of the end-user and manufacturer.

Stress Rupture and Creep Testing Lab Processes

Creep and stress rupture testing services are generally performed at elevated temperatures, which may be as high as nearly a few thousand degrees Fahrenheit. Stress rupture and creep test machines apply static stress to a test specimen at a specific temperature while equipment tracks deformation on a strain vs. time plot.

Stress Rupture	Creep
The stress rupture test determines the time necessary to produce failure while the material undergoes constant load at a constant temperature. The test measures the time to rupture and the effect of temperature on long-time load-bearing characteristics. The reported results are beneficial for selecting materials where dimensional tolerances are not critical, but rupture cannot be allowed. Stress rupture testing is similar to creep testing, except with higher stresses.	The creep test is time-dependent and measures dimensional changes to a specimen due to high temperature after applying a constant load below its yield strength. An extensometer measures the specimen’s elongation or deformation, thereby calculating how a component or part will change in shape during service. Creep testing is vital when dimensional control is crucial at high temperatures or for determining time-to-failure.

Stress Rupture

Creep

The stress rupture test determines the time necessary to produce failure while the material undergoes constant load at a constant temperature. The test measures the time to rupture and the effect of temperature on long-time load-bearing characteristics. The reported results are beneficial for selecting materials where dimensional tolerances are not critical, but rupture cannot be allowed. Stress rupture testing is similar to creep testing, except with higher stresses.

The creep test is time-dependent and measures dimensional changes to a specimen due to high temperature after applying a constant load below its yield strength. An extensometer measures the specimen’s elongation or deformation, thereby calculating how a component or part will change in shape during service. Creep testing is vital when dimensional control is crucial at high temperatures or for determining time-to-failure.

Capabilities

Fully automated machines that perform the tests at temperatures up to 2000°F.
Reliable temperature control using calibrated thermocouples attached to the test specimens.
Automatically adjusted load at various time intervals for efficiency.
Nadcap and A2LA ISO/IEC 17025 accredited and ASTM-compliant.
Specimen machining: Smooth, notched, combination, or flat
Specifications: ASTM E139, ASTM E292, NASM-1312-10
Approvals:
- GE Aviation
- P&W qualified as a commercial laboratory for Reference MCL Manual Section Appendix 56: Code 3 stress-rupture testing

LTI Is a Material Testing Lab Leader

A stress rupture and creep testing lab will provide fundamental material characterizations for real-world load conditions. Performing these tests at elevated temperatures ensures the material can withstand significant thermal stress before failure and rapidly ages samples for rapid test result turnaround.

At LTI, we pride ourselves on a prompt turnaround to our customers’ testing needs. Our state-of-the-art lab is staffed with field experts and furnished with sensitive equipment, offering our customers a one-stop testing solution for all their materials and product parameters.

LTI has been a trusted partner with unmatched customer service, dependable deliveries, and excellent quality in mechanical and ultrasonic testing for many years. The entire team at LTI truly cares about their customers and I look forward to working with them for a long time.

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Laboratory Testing Inc. has the capacity and capabilities to handle all your material testing needs in a single location. Since 1984, we’ve aided customers worldwide with accurate nondestructive testing and precise material lab services. Request a quote or contact us today to see how our industry-leading turnaround times can keep your mission-critical approvals moving forward.

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