20. Lengthwise Gauges¶
Lengthwise gauges, commonly referred to as L-Gauges, measure a change in the length of a specimen. These gauges can be secured directly to the specimen or to the jaw assembly. These gauges can be used to calculate the strain experienced by the specimen and can be used to control mechanical movements.
20.1. 3000 Series Gauges¶
20.1.1. Jaw-to-Jaw Lengthwise Extensometer - Range: ±12.7 mm¶
Fig. 20.1 Jaw-to-Jaw Lengthwise Extensometer - DSI# 39050.
The 39050 Jaw-to-Jaw Lengthwise Extensometer is mounted on the Pocket Jaws of the General-Purpose Mobile Conversion Unit for the Gleeble 3500, 3800, and the Compression Test Adapter. Gleeble 3180 systems utilize a 39052 Jaw-to-Jaw Lengthwise Extensometer. Each can be used to provide precise measurement of the movement of the jaws.
| Characteristic | Specification |
|---|---|
| Type | LVDT |
| Linear Range | ±12.7 mm (0.5 in) |
| Linearity | ±0.25 % of full scale |
| Resolution | ±2 μm (7.87 x 10-5 in) |
| Gauge Length | 0 - 31 mm (0 - 1.22 in) |
| Maximum Usable Stroke Rate | 500 mm/s (19.68 in/s) |
| Maximum Deformation Rate With L-Gauge Control | 50 mm/s (1.969 in/s) |
| Control Modes | Length Measurement, Stress, Strain, Deformation |
| Part Number | Description | Sold As |
|---|---|---|
| 39050 | Jaw-to-Jaw Lengthwise Extensometer - Kit and Module included - 3500 and 3800 | Ea. |
| 39052 | Jaw-to-Jaw Lengthwise Extensometer - Kit and Module included - 3180 | Ea. |
| Replacement Parts | ||
| 39051 | Jaw-to-Jaw Lengthwise Extensometer and Kit - (Module not included) - 3500 and 3800 | Ea. |
For additional parts, accessories and consumables, reference Measurement Gauge Parts and Accessories.
20.1.2. High-Resolution Jaw-to-Jaw Lengthwise Extensometer - Range: ±2.54 mm¶
The 39053 High-Resolution Jaw-to-Jaw Lengthwise Extensometer is similar to the standard 39050 Extensometer. Although the 39053 has a smaller linear range, the higher resolution makes this extensometer invaluable when measuring minute and subtle changes in a specimen.
| Characteristic | Specification |
|---|---|
| Linear Range | ±2.54 mm (0.099 in) |
| Linearity | ±0.25 % of full scale |
| Resolution | ±0.4 μm (1.57 x 10-5 in) |
| Maximum Usable Stroke Rate | 500 mm/s (19.68 in/s) |
| Maximum Deformation Rate With L-Gauge Control | 50 mm/s (1.969 in/s) |
| Control Modes | Length Measurement, Stress, Strain, Deformation |
For additional parts, accessories and consumables, reference Measurement Gauge Parts and Accessories.
| Part Number | Description | Sold As |
|---|---|---|
| 39053 | High-Resolution Jaw-to-Jaw Lengthwise Extensometer - Kit and Module included - 3500 and 3800 | Ea. |
20.1.3. Hot Zone Lengthwise Extensometer - Range: ±12.5 mm¶
Fig. 20.2 Hot Zone Lengthwise Extensometer - DSI# 39061.
The 39061 Hot Zone Lengthwise Extensometer is an LVDT-based measuring device. The 39061 HZT gauge is a design improvement for the popular 39060 Hot Zone Gauge. Both devices utilize the same LVDT and specimen contact methodologies. However this is where the similarities end. The new 39061’s improved design enables easier gauge installation. The redesign also allows for more consistent gauge placement test to test. Just like the traditional 39060, the new 39061 HZT measures lengthwise strain using alumina and quartz rods in contact with the hot zone of the specimen. The 39061 is equipped with two spacer blocks used to set a defined starting gauge length.
| Characteristic | Specification |
|---|---|
| Type | LVDT |
| Defined Gauge Spacer Blocks | 10 mm and 25 mm |
| Linear Range | ±12.5 mm (1.0 in) |
| Linearity | ±0.25 % of full scale |
| Resolution | ±2 μm (7.87 x 10-5 in) |
| Gauge Length | 0 - 25.4 mm (0 - 1.00 in) |
| Maximum Usable Stroke Rate | 500 mm/s (19.68 in/s) |
| Maximum Deformation Rate With L-Gauge Control | 50 mm/s (1.969 in/s) |
| Control Modes | Length Measurement, Stress, Strain, Deformation |
Note
Alumina contact rods are rated for continuous operation between 0 - 1,200°C (32 - 2,192°F) and a limited time (30 seconds) up to 1,300°C (2,372°F).
Note
Quartz contact rods are rated for continuous operation between 11 - 1,300°C (50 - 2,372°F) and limited (30 second) operation up to 1,400°C (2,552°F).
| Part Number | Description | Sold As |
|---|---|---|
| 39061 | Hot Zone Lengthwise Extensometer - Kit and Module included | Ea. |
20.1.4. Hot Zone Lengthwise Strain Gauges¶
Fig. 20.3 Hot Zone Lengthwise Strain Gauge.
The Gleeble Hot Zone L-Strain Gauges are full-bridge strain gauges equipped with alumina rods that contact the specimen in the hot zone for lengthwise measurement of strain. DSI offers three different Hot Zone Gauges with varying measurement ranges and initial set points.
These gauges feature a unique mounting design. The measurement gauge is held onto the specimen by light, flexible, ceramic fiber cords. These ceramic fiber cords make the gauge nearly self-supporting and eliminate the need for bulky mounting brackets.
The light weight of the gauge combined with the self-supporting design virtually eliminates side loading on the specimen. The combination of radiant heat shields and convection cooling fins allows use of the gauges at elevated specimen temperatures for short periods of time without additional cooling. A valve, regulator, vacuum tank feedthroughs and hoses for additional gas cooling of the gauge are included with the kit. For typical operation, compressed air is used to provide additional cooling to the gauges.
| Characteristic | Specification | ||
|---|---|---|---|
| DSI Part Number | 39070 | 39071 | 39072 |
| System Identification Number | HZT070 | HZT071 | HZT072 |
| Linear Range | +0.5/-0.2 in (+12.7/-5.08 mm) | +5/-2 mm (+0.197/-0.079 in) | +12.5/-5 mm (+0.492/-0.196 in) |
| Gauge Length | 1.0 in (25.4 mm) | 10 mm (0.394 in) | 25 mm (0.984 in) |
| Maximum Tension Range | 0.5 in (12.7 mm) | 5 mm (0.197 in) | 12.5 mm (0.492 in) |
| Maximum Compression Range | 0.2 in (5.08 mm) | 2 mm (0.079 in) | 5 mm (0.197 in) |
| Type | Full-Bridge Strain Gauge | ||
| Linearity | ±0.15 % of full scale | ||
| Resolution | ±2 μm (7.87 x 10-5 in) | ||
| Maximum Usable Rate | 10 mm/s (0.394 in/s) | ||
| Main Body Cooling | Compressed Air or Helium at 0.34 bar (5 psi) | ||
| Control Modes | Measurement Only | ||
Note
Alumina contact rods are rated for continuous operation between 0 - 1,200°C (32 - 2,192°F) and a limited time (30 seconds) up to 1,300°C (2,372°F).
| Part Number | Description | Sold As |
|---|---|---|
| 39070 | Hot Zone Lengthwise Strain Gauge - Range: +0.5/-0.2 in | Ea. |
| 39071 | Hot Zone Lengthwise Strain Gauge - Range: +5/-2 mm | Ea. |
| 39072 | Hot Zone Lengthwise Strain Gauge - Range: +12.5/-5 mm | Ea. |
For additional parts, accessories and consumables, reference Measurement Gauge Parts and Accessories.
20.1.5. Hydrawedge II Lengthwise Strain Gauge - Range: ±25.4 mm¶
Fig. 20.4 Hydrawedge II Lengthwise Strain Gauge - DSI# 39057.
The 39055 Hydrawedge L-Strain System is designed specifically to be mounted in the Hydrawedge II MCU.
| Characteristic | Specification |
|---|---|
| Type | LVDT |
| Linear Range | ±25.4 mm (1.0 in) |
| Linearity | ±0.25 % of full scale over ±25.4 mm (±1.0 in) |
| Resolution | ±2 μm (7.87 x 10-5 in) |
| Gauge Length | 0 to 31 mm (0 to 1.22 in) |
| Maximum Usable Stroke Rate | 2,000 mm/s (78.74 in/s) |
| Maximum Recommended Strain Rate | 50/s |
Note
The effective maximum strain rate is dependent on the specimen material, size, and test temperature.
| Part Number | Description | Sold As |
|---|---|---|
| 39057 | Hydrawedge II Lengthwise Strain Gauge - Kit and Module included | Kit |
| Replacement Parts | ||
| TRN006 | 6 inch LVDT Stroke Transducer | Ea. |
| TRN006A | Measurement Core for TRN006 | Ea. |
| TRN006B | Measurement Core Bushing for TRN006 | Ea. |
20.2. 500 Series Gauges¶
20.2.1. Jaw-to-Jaw Lengthwise Strain Gauge for Gleeble 500 Series - Range: ±12.7 mm¶
Fig. 20.5 Jaw-to-Jaw Lengthwise Strain Gauge for Gleeble 500 Series - DSI# 59011.
The 59011 Jaw-to-Jaw Lengthwise Strain System is mounted on the Pocket Jaws in the Gleeble system. It can be used to provide precise measurements of the movement of the jaws without being affected by compliance in the rest of the load train.
| Characteristic | Specification |
|---|---|
| Type | LVDT |
| Linear Range | ±12.7 mm (0.5 in) |
| Accuracy | ±0.1 % of full scale |
| Resolution | 0.6 μm (2.36 x 10-5 in) |
| Response Time | 0.5 ms |
| Gauge Length | 0 - 31 mm (0 - 1.22 in) |
| Control Modes | Lengthwise Measurement, Stress, Strain |
| Part Number | Description | Sold As |
|---|---|---|
| 59011 | Jaw-to-Jaw Lengthwise Strain Gauge for Gleeble 500 Series - Kit and Module included | Ea. |
For additional parts, accessories and consumables, reference Measurement Gauge Parts and Accessories.