Crack Propagation (RDS)

RDS: Strain Gauges For Determining Crack Propagation

The RDS strain gauges are used to determine crack propagation in a component. HBK offers four different types:

• RDS20 and RDS40 consist of electrically isolated conductor tracks (resistors), i.e. as the crack extends, individual circuits will be interrupted. If the circuits are contacted individually, the direction in which the gap is extending can be detected. In this case, individual circuits are interrupted as the crack propagates.
   

• RDS17.8 and RDS22 consist of conductor tracks connected in parallel which will tear if the crack extends under the crack propagation gauge. This will gradually increase the electrical resistance of the strain gauge as the crack continues to extend.