Stress Relaxation Tester - TT-SR Series
ASTM E328, ISO 15630-3
Torontech's Stress Relaxation Tester - TT-SR Series is used to determine stress-relaxation of metals, such as pre-stressed concrete strand, pre-stressed concrete bar, steel rope...etc. To determine stress-relaxation of a material the specimen is deformed a given amount and decrease in stress is recorded over prolonged period of exposure at constant elevated temperature.
ASTM E328 Standard Test Methods for Stress Relaxation Tests for Materials and Structures. This method covers the standard test methods for stress relaxation tests for materials and structures. Stress relaxation in a material is an important characteristic to consider when designing with mechanical fasteners that must hold with a permanent tightness. Long term failure of fastener might occur if stress relaxation is not considered.
According to ASTM, applications that are often tested with this standard include, bolted of riveted assemblies, press of shrink-fit components, rolled-in tubes, gaskets tightness, constraining force of springs, and stability of wire in pre-stressed concrete. This test is also valid for measuring stress relaxation of a material an area of high stress concentration. The test environment must be highly controlled to prevent changes to the material due to environmental conditions.
Model | TT-SR-200 | TT-SR-300 | TT-SR-400 | TT-SR-500 |
Standards | ASTM E328, ISO 15630-3 | |||
Capacity | 200kN | 300kN | 400kN | 500kN |
Measuring Range | 8 – 200kN | 12 – 300kN | 16 – 400kN | 20 – 500kN |
Load Resolution | 7N | 10N | 12N | 15N |
Load Accuracy | ±1% | |||
Load Measuring Accuracy | ±0.1% of reading to 1/100 of load weighing system capacity meets or exceeds the requirements of the following standards: ISO 7500-1, EN 10002-2, ASTM E4, JIS B7721 | |||
Creep of Load Cell | 30 minutes ≤ 0.02% | |||
Position Accuracy | ±0.5% | |||
Horizontal Span | 1850mm | |||
Ball Screw Stroke | 100mms | |||
Loading Speed | 100 - 5000N/S | |||
Speed Accuracy | Set speed＜0.05% - Max. Speed: ±1%, set speed ≥0.05% - Max. speed:±0.5% | |||
Temperature Accuracy | Temperature sensor resolution: 0.1℃, temperature sensor accuracy: ±0.3℃ | |||
Position Measurement Accuracy | ±0.01 of reading or 0.0001 mm, whichever is greater | |||
Specimen Dimensions | ||||
PC Strand (mm) | Φ12.7 - Φ15.24 | Φ12.7 - Φ15.24 | Φ12.7 - Φ15.24 | Φ15.2 - Φ21.8 |
PC Wire (mm) | Φ3 - Φ9 | Φ3 - Φ9 | Φ3 - Φ9 | Φ3 - Φ9 |
PC Bar (mm) | Φ7 - Φ18 | Φ7 - Φ18 | Φ7 - Φ18 | Φ7 - Φ18 |
Power Supply | Please specify voltage and frequency before placing the order.Standard optional voltages 3ph, 220/380VAC, 50-60 Hz, Power must be free of spikes and surges exceeding 10% of the nominal voltage. | |||
Operating Temperature | 0 to +38°C (+32 to +100°F) | |||
Humidity Range | 10% to 90% non-condensing | |||
Storage Temperature | -40 to +66°C (-40 to +150°F) | |||
Machine Dimension | 1950 × 540 × 1015mm (L × W × H) | |||
Weight | 1400kg | |||
Standard Configurations | Main unit | Control unit | ||
Servo systems: driver and motor | Speed reducer | |||
Synchronous toothed belt | Temperature recorder | |||
Anchorage | Computer | |||
ToronSoft | Printer | |||
Linear gauge extensometer | ||||
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