クラック伝播（ RDS ）

RDSシリーズのひずみゲージは、部品のクラック伝播（RDS）を判定することができます。

クラック伝播（ RDS ）

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RDS：ひずみゲージによるひび割れの伝搬判定

RDSひずみゲージは、部品のクラック伝播（RDS）を測定するために使用されます。HBKには4つのタイプがあります。

RDS20およびRDS40 電気的に絶縁された導体トラック（抵抗器）で構成されています。回路を個別に接触させれば、ギャップが伸びている方向を検出することができます。この場合、亀裂が伝播するにつれて個々の回路が遮断されます。

RDS17.8およびRDS22 は、並列に接続された導体トラックから構成されており、亀裂が亀裂伝播ゲージの下にまで及ぶと破断します。これにより、ひずみゲージの電気抵抗は、ひび割れが伸び続けるにつれて徐々に増加します。

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計測グリッド幅 keyboard_arrow_down
計測グリッド幅 keyboard_arrow_down
計測グリッド長 keyboard_arrow_down
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キャリア幅 keyboard_arrow_down
キャリア幅 keyboard_arrow_down

Code	計測グリッド長	計測グリッド長	計測グリッド幅	計測グリッド幅	キャリア長	キャリア長	キャリア幅	キャリア幅
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 - 取扱説明書

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English

Certificates and Approvals

Strain Gauges - 適合宣言

Declaration of Conformity

English

Crack Propagation (RDS)
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

List of accessories available for all variants of this family

Product Code	説明
K-KAB-ML	Measurement cable by the meter

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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