Tensile Stress Relaxation Testing Machine

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Tensile Stress Relaxation Testing Machine
High Capacity Tensile Stress Relaxation Testing Machine
High Capacity Tensile Stress Relaxation Testing Machine

High Capacity Tensile Stress Relaxation Testing Machine


SLL 1000~2000


SLL Series High Capacity Tensile Stress Relaxation Testing Machine is used  to determine stress-relaxation of metal,  such as Pre-stressed concrete strand, Pre-stressed concrete bar, steel rope  and so on, the specimen is deformed a given amount and decrease in stress is recorded over prolonged period of exposure at constant elevated temperature. The product accords with the relevant requirements of ASTM E328-02(2008) Standard Test Methods for Stress Relaxation Tests for Materials and Structures.


•Automatic draw the real time curve of residual stress versus time, temperature versus time and relaxation rate versus time.

•Automatic calculate 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.

•The value of temperature reading of test specimen is displayed, monitored and recorded throughout the test duration.

•High precision temperature recorder attached to record the influence of room temperature variations in the force curve.

•Servo-controlled drive system ensures the high precision load/displacement close-loop control, besides, it has a very low noise during the whole test.

•Loading speed could be set arbitrarily.

•Selectable Constant load and constant displacement control.

•Can automatically calculate stress relaxation properties of the specimen and print complete test diagram.

•Realize digital calibration of load quickly and accurately, and has over-load protection function.

•Custom EXCEL report template available.

•The coordinate of the curves can be automatically adjusted. When the test begins, the system will automatically adjust the coordinate value. During the whole test process, the curves remain complete. The test requirements can be automatically stored, derive and reset.

•Data acquisition: Four different data sampling rate in different stage of test period makes the data acquisition more practical and avoid repeated sampling on the same data.

•Dual strain gauge are introduced into machine for constant strain rate constraint.

•Completely meet and exceed the requirements on standards for grip distance greater 2.4m.

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