Specifications
Maximum relaxation test force: 300KN;
Accuracy level: Level 1;
Relative error of indication: ±1%;
Effective measurement range: 1%-100%F·S (full scale is not divided);
Test force resolution: 1/±300,000 F.S (the resolution of the whole process is unchanged);
Relaxation load loading rate: 100~5000N/S arbitrarily set;
Deformation measurement range: 0.2% to 100% FS;
Deformation measurement resolution: 0.001mm;
Steel strand loose deformation gauge length: 100-1000mm;
Steel strand gauge length: ≥ steel strand nominal diameter 60 times;
Slack screw travel: 0-120 mm;
Screw movement adjustment rate: 0.001 ~ 50mm / min;
Sample length: 2450mm;
Working time: ≥1000h;
Steel strand relaxation load application: continuous loading, uniform rate loading, constant load, strain retention;
Nominal diameter of steel strand (mm): φ9.50/φ11.10/φ12.70/φ15.24
Mainframe dimensions: 2200 mm × 550 mm × 1000 mm;
Machine power: 2.2kW;
Machine weight: 910kg

SS-300AS microcomputer controlled steel strand stress relaxation tester is a high-precision material testing equipment that adopts servo control technology, computer data acquisition and processing, and can realize closed-loop control and automatic detection. It consists of test host, servo control system, measurement and control system, The test instrument consists of four parts, the maximum test force is 300kN, and the test machine accuracy level is better than level 1.
SS-300AS microcomputer controlled steel strand stress relaxation test machine is used for tensile stress relaxation test of prestressed steel wire, steel strand, PC steel bar and metal material; isothermal stress relaxation test; stress relaxation test period ≥1000h.

The isothermal stress relaxation test is to maintain the sample at a given temperature (20 ° C ± 2 ° C), a certain length (L0 + △ L0), from the initial force F0, determine the change in force on the sample; stress relaxation test period 120h ~ 1000h can be set.

Initial test force, initial test force hold, zero time to maintain initial total strain, constant gauge length, continuous recording of test force and temperature, timed test force and temperature, monitoring of initial total strain and gauge length, relaxation rate, relaxation characteristic curve (remaining Test force - temperature, force - relaxation rate, force - displacement deformation, etc.).

Stress relaxation test time (start time, given time, recording force interval time, continuous recording, relaxation time ≥ 1000h).