Dynamic Stress & Strain Measurement

Optical 3D Strain Measurement

Understanding the origin of the stress and strain distribution is crucial to increasing the durability of components under dynamic load. Numerical simulations based on finite element (FE) models help with this understanding but must be validated by real component data. Polytec’s 3-D Scanning Laser-Doppler Vibrometer with StrainProcessor provides an advanced, non-contact optical test solution.

  • Polytec’s StrainProcessor
  • Strain Processor

Polytec’s StrainProcessor is an extension developed for easy FE model updating and for comparisons to calculated stress and strain distributions. It comprises a set of hardware and software components enabling a PSV-500-3D Scanning Vibrometer – a precision tool for full-field optical vibration mapping – to measure and analyze the dynamic strain and stress distribution on surfaces with high resolution and low noise.

The Scanning Vibrometer makes a series of non-contact deflection measurements on a predefined grid using the laser probe to characterize strain at each point instead of attaching individual strain gauges. Thus, the test set-up is fast and very repeatable with no mass loading from an attached transducer. Tests are fast and avoid the high cost of preparing and instrumenting the sample with strain gauges.