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INDUSTRIAL TESTING MACHINES - Stress Relaxation Tester

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.

  • Real-time display load versus time, temperature versus time and relaxation rate versus time curves
  • Automatic calculate 1000 hours tensile stress relaxation rate.
  • High-precision temperature recorder attached to record the influence of room temperature variations
  • Servo-controlled drive system ensures the high precision load/displacement/strain close-loop control as well as low noise
  • User configurable test methods and customizable report template
  • Self-alignment design on specimen anchorage to ensure the high accuracy
  • Patent calibration system is mounted on machine to calibrate not only the load cell but also the whole system without disassembly the load cell from machine
  • 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
    Quote Form

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