Crack Propagation (RDS)

RDS series strain gauges allow determining crack propagation in components.

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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.

Code	Measuring grid length [mm]	Measuring grid length [in]	Measuring grid width [mm]	Measuring grid width [in]	Carrier length [mm]	Carrier length [in]	Carrier width [mm]	Carrier width [in]
1-RDS17.8	17.8 mm	0.701 in	38.75 mm	1.526 in	21 mm	0.827 in	41.6 mm	1.638 in
1-RDS 40	40 mm	1.575 in	8.4 mm	0.331 in	47 mm	1.85 in	10 mm	0.394 in
1-RDS 20	20 mm	0.787 in	22.5 mm	0.886 in	28 mm	1.102 in	25 mm	0.984 in
1-RDS 22	22 mm	0.866 in	5 mm	0.197 in	27.8 mm	1.094 in	6.8 mm	0.268 in

File	Description	Type	Languages	Size
Strain Gauges and Accessories - Statement of Compliance (C05550)	Strain Gauges and Accessories - Statement of Compliance	Certificate	English	297 KB
Strain Gauges - Catalogue (S01265)	Strain Gauges - Catalogue	Marketing Document	English	5 MB

Crack Propagation (RDS)
Type/technology	Foil strain gauge
Application	Stress Analysis / structural testing
Geometry	Y rosette
Measuring grid length [mm]	22 mm, 17.8 mm, 20 mm, 40 mm
Measuring grid length [in]	0.866 in, 0.701 in, 0.787 in, 1.575 in
Measuring grid width [mm]	5 mm, 38.75 mm, 22.5 mm, 8.4 mm
Measuring grid width [in]	0.197 in, 1.526 in, 0.886 in, 0.331 in
Carrier length [mm]	27.8 mm, 21 mm, 28 mm, 47 mm
Carrier length [in]	1.094 in, 0.827 in, 1.102 in, 1.85 in
Carrier width [mm]	6.8 mm, 41.6 mm, 25 mm, 10 mm
Carrier width [in]	0.268 in, 1.638 in, 0.984 in, 0.394 in
Temperature range	Limited temperature range
Nominal resistance	Other resistance
Gauge factor (measuring grid material)	Constantan (ca 2.0)
Temperature response	No matching of temperature response
Maximum elongation	Standard
Fatigue life	Standard
Connection configuration	Leads
Mounting	Glued
Grid protection	Covered