Skip navigation

Test Devices

The Issue

Standard spin pit burst testing is done to establish a speed, above the operating and over-speeds, at which the rotating assembly fails due to centrifugal stress. Customers need this failure speed to determine the safety margin during normal operation. While a standard burst test only provides the failure speed, High Speed Video supplies additional information that helps customers determine the cause of the burst.

Why it Matters

Most customers make a notable investment in the design and fabrication of a test assembly, and it is reduced to shrapnel in a burst test. High Speed Video provides clear visual evidence of what happened prior to and during failure. This additional information can provide substantial value for improving component design.

Video Examples

Example 1

Burst testing of 30 inch diameter turbine forging.

Example 2

Burst testing of an impeller at approximately 50,000 rpm

Example 3

Burst testing of a fan assembly at approximately 6,000 rpm.

What You Can Do

Test Devices can provide a High Speed Video recording of the failure event on a burst test.

These videos can provide additional data that is critically important to designers in determining what failed first in the rotating assembly. Often, during the first slow motion playback of the burst event, customers are able to determine if the rim or bore section of the test rotor triggered the burst event.

Test Devices employs cutting-edge high speed video technology to provide exceptional image clarity. The system captures and saves the trigger event as well as the visual history leading to the event. Test Devices’ High Speed Video also benefits the failure analysis process that follows a burst test. Metallurgical engineers are able to quickly hone in on the critical pieces of the burst fragments to direct their examination.

Thermal
Thermal Testing Option

The High Speed Video option is also available on thermal tests. It is necessary to filter out color that results from the elevated temperature, but good results are still possible.

Coating
Coating Scheme Option

As part of the high speed video process Test Devices offers an optional coating scheme which can accentuate the clarity of the video. A patterned coating applied to the disk surface provides reference points, which are visible on the video, benefiting the post-test analysis process. This is particularly useful for burst testing disks that are homogeneous, by providing landmarks for correlation between burst video and post-test analysis.