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RDS 系列应变片可用于确定部件中的裂纹扩展状况。
裂缝扩展片(RDS)
RDS 应变片用于确定部件中的裂纹扩展状况。HBK 提供四种不同的型号：
| Type/technology | Foil strain gauge |
| Application | Stress Analysis / structural testing |
| Geometry | 3-grid rosette |
| Measuring grid length | 22 mm, 17.8 mm, 20 mm, 40 mm |
| Measuring grid length | 0.866 in, 0.701 in, 0.787 in, 1.575 in |
| Measuring grid width | 5 mm, 38.75 mm, 22.5 mm, 8.4 mm |
| Measuring grid width | 0.197 in, 1.526 in, 0.886 in, 0.331 in |
| Carrier length | 27.8 mm, 21 mm, 28 mm, 47 mm |
| Carrier length | 1.094 in, 0.827 in, 1.102 in, 1.85 in |
| Carrier width | 6.8 mm, 41.6 mm, 25 mm, 10 mm |
| Carrier width | 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 | Bondable |
| Grid protection | Covered |
This change in resistance can be measured using a resistance meter or strain gauge amplifier.
A resistance measurement can be used to detect the signal of the RDS crack propagation gauges. HBK DAQ systems can be used for this application (e.g. QuantumX or MGCplus).
The resulting resistance (R) of the RDS is dependent on the number of torn links and can easily be calculated. In this case, n identical resistors (Ri) are connected in parallel:
If a grid line is interrupted, this is described by
However, the measurement can be performed just as well with a measuring amplifier for SG measurements. The circuit diagram sketch shows how the RDS has to be complemented to obtain a resistance change that is inside the measuring range of an amplifier for strain gauge quarter bridges.
To minimize the effects of temperature, temperature-stable fixed resistors or SGs should be used as completion resistors. Greater sensitivity can be obtained by selecting a parallel resistor with a higher resistance value.
Do you have special requirements that are not adequately covered by any of the strain gauges in our standard program? Are you looking for an equivalent strain gauge for the product you are currently using? Have you designed your own strain gauge? Contact us, and we will produce customized strain gauges for you.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
