裂纹扩展 (RDS)

RDS系列应应变计允许确定裂纹在部件中的扩展。

裂纹扩展 (RDS)

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RDS:用于确定裂纹扩展的应变计/h2>
RDS应变计用于确定部件中的裂纹扩展。HBK提供了四种不同类型的：
Ul.
RDS20 和 RDS40 由电隔离的导体轨道(电阻)组成，即随着裂纹的扩展，个别电路将中断。如果单独接触电路，可以检测到间隙延伸的方向。
在这种情况下，随着裂缝的扩展，个别电路被中断。
Ul.
RDS17.8 和 RDS22 由平行连接的导体轨道组成，如果裂纹在裂纹扩展表下延伸，这些导体轨道将撕裂。这将随着裂纹的不断延伸而逐渐增加应变片的电阻。

Code	测量栅丝长度	测量栅丝长度	Measuring grid width	Measuring grid width	Carrier length	Carrier length	Carrier width	Carrier width
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 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
1-RDS 40	40 mm	1.575 in	8.4 mm	0.331 in	47 mm	1.85 in	10 mm	0.394 in

RDS - 操作說明

Manual

English

Certificates and Approvals

Strain Gauges - 符合性聲明

Declaration of Conformity

English

Crack Propagation (RDS)
Type/technology	Foil strain gauge
Application	Stress Analysis / structural testing
Geometry	Y 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.

Connecting a crack propagation gauge and detecting signals

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.

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裂纹扩展 (RDS)

Connecting a crack propagation gauge and detecting signals

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