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Stress Relaxation Testing Systems

RELAK-500 Tensile Stress Relaxation Testing Machine

UNIVER RELAK500 Series is used to determine stress-relaxation of metal, such as Prestressed concrete strand, Prestressed 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: Standard Test Methods for Stress Relaxation Tests for Materials and Structures
ISO 15630-3: Steel for the reinforcement and prestressing of concrete - Test methods - Prestressing steel (Isothermal Stress Relaxation Test)
 

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Model
 
RELAK-
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%
Specimen Length
mm
2500
Ball Screw Stroke
mm
100
Loading Speed
N/S
100-5000
Temperature Accuracy
Temperature sensor resolution:0.1℃
Temperature sensor accuracy:±0.3℃
 
Specimen Dimensions
 
 
PC Strand
mm
Φ12.7Φ15.24
Φ12.7Φ15.24
Φ12.7Φ15.24
Φ15.2Φ21.8
 
PC wire
mm
Φ3Φ9
Φ3Φ9
Φ3Φ9
Φ3Φ9
 
PC Bar
mm
Φ7Φ18
Φ7Φ18
Φ7Φ18
Φ7Φ18
 
Machine Dimensions
mm
2700*480*1150
Weight
kg
1650
 
 
General Specifications
 
Load Measurement Accuracy:
±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, and JIS B7721.
 
Speed Accuracy:
Set speed0.05% Max. Speed: ±1%    Set speed ≥0.05% Max. speed:±0.5%
 
Position measurement accuracy:
±0.01% of reading or 0.0001 mm, whichever is greater
 
Power supply:
200kN/300kN: Single phase 220VAC, 50-60 Hz, Power must be free of spikes and surges exceeding 10% of the nominal voltage.
400kN/500kN: Three phase 220/380VAC, 50-60 Hz, Power must be free of spikes and surges exceeding 10% of the nominal voltage.
 
Humidity Range:
10% to 90% non-condensing,
 
Storage Temperature:
-40 to +66°C (-40 to +150°F)
 
Note:
1.       Extra length frames is available
2.       Extra specimen diameter is available
3.       Power supply system is completely customizable.
4.       Specifications are subject to change without notice.
Kemp House 152 / 160 City Road London EC1V 2NX
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