Stress Relaxation Tester
Stress Relaxation Tester

Stress Relaxation Tester

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.

The Stress Relaxation Tester – TT-SR Series complies with ASTM E328-02(2008) Standard Test Methods for Stress Relaxation Tests for Materials and Structures.

Deskripsi Produk


  • Real-time curve of residual stress versus time, temperature versus time and relaxation rate versus time
  • Automatic calculation of 1000 hours stress relaxation rate of the specimen. The calculation method has double logarithm option and single logarithm option and calculating data has entire data option and data at certain time option
  • High precision temperature recorder attached to record the influence of room temperature variations in the force curve
  • Servo-controlled, low noise driving system offers a quite high precision load/displacement close-loop control
  • Adjustable loading speed
  •  Selectable constant load and constant displacement
  • Automatic calculation of stress relaxation properties
  • Over-load protection function.
  • Customizable report template
  • Automatic adjustment of curves coordinate
  • Optional strain gauge for more precise deformation measurement
  • Optional patented calibration system mounted on machine to calibrate both the load cell and the whole system without disassembly the load cell from machine


Technical Specifications of Stress Relaxation Tester – TT-SR Series

Model TT-SR-200 TT-SR-300 TT-SR-400 TT-SR-500
Load Capacity kN 200 300 400 500
Measuring Range kN 8-200 12-300 16-400 20-500
Load Resolution N 7 10 12 15
Load Accuracy % ±1%
Creep of load cell % 30 minutes<=0.02%
Position Accuracy % ±0.5%
Horizontal Span mm 1850
Ball Screw Stroke mm 100
Loading Speed mm/min 100-5000N/S
Temperature Accuracy Temperature sensor resolution:0.1℃
Temperature sensor accuracy:±0.3℃
Specimen Dimensions
PC Strand mm Φ12.7~Φ15.24 Φ12.7~Φ15.24 Φ12.7~Φ15.24 Φ15.2~Φ21.8
PC Rope mm Φ3~Φ9 Φ3~Φ9 Φ3~Φ9 Φ3~Φ9
PC Bar mm Φ7~Φ18 Φ7~Φ18 Φ7~Φ18 Φ7~Φ18
Machine Dimensions mm 1,950*540*1,015
Weight kg 1,400

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