An innovative ultrasonic testing facility for tension-compression experiments was developed at the Institute of Materials Science and Engineering (WKK) at the University of Kaiserslautern in Germany. Polytec’s 3-D scanning laser vibrometer was used to measure the eigenfrequencies and eigenmodes and verify the finite element model. The work done in cooperation with Polytec illustrates possible applications of 3-D scanning vibrometry in the field of ultrasonic fatigue testing of metals. 3-D scanning vibrometry is also capable of non-contact local strain measurement with a high spatial resolution and offers an alternative to strain gages for evaluation of high mechanical stresses along the gauge length during ultrasonic fatigue testing.

More information: http://www.polytec.com/us/applications/materials-research-mechanical-civil-engineering/