laserXtens was developed for use with a majority of the classical materials and testing requirements.
Various physical considerations mean that reliable operation of laserXtens requires observance of a greater number of general conditions than when using contact-type extensometers.
- The specimen surface must reflect enough laser light to generate sufficiently well-formed speckle patterns. This is the case with most metals and plastics. If necessary simple aids can be used to improve conditions on the specimen surface.
- The specimen must be fixed firmly in the center of the test axis in order to minimize movement out of the measurement axis.
- A low-vibration environment is necessary for safe, reliable, accurate operation (laboratory conditions).
All specimen gripping systems which hold the specimen firmly in the center of the test axis are suitable, e.g. hydraulic, pneumatic and screw grips.
In the case of plastics, pre-testing is necessary to determine the reflective properties of the material.
Pre-testing also allows the Zwick Testing Laboratory to assemble the optimum configuration for your particular application. The properties and condition of the specimen surface (reliable measurement signal, resolution), the specimen grips in use (elimination of out-of-plane movement) and the measurement travel required are all checked. Zwick guarantees reliable operation of laserXtens on the basis of pre-tested specimens and testing conditions (= process reliability).