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Design Basis:
GB/T5224-2003Steel Strand for Prestressed Concrete;
GB/T10120-1996Metallic stress relaxation test method
1： Main functions and features of the product
1In the design process, the testing machine absorbed the design concepts and structural characteristics of famous steel hinge line testing machine companies such as Germany and Italy, and was developed based on relevant national standards for steel hinge line testing;
2The testing machine adopts a vertical structure, with the upper crossbeam forming a tensile testing space through double columns and a worktable. The power transmission mechanism (consisting of an AC servo speed regulating motor, a reducer, and a screw pair) is installed below the worktable, and the loading screw moves up and down to drive the lower jaw to move, thereby achieving loading of the sample; The force sensor is installed on the upper crossbeam and connected to the upper clamp seat. The testing machine has high rigidity to ensure the accuracy of the test results;
3Adopting Lenovo brand computers and absorbing advanced testing machine control technology from foreign testing machine companies, according to national standardsGB/T5224-2003Steel Strand for Prestressed ConcreteGB/T10120-1996According to the relevant requirements of the "Metal Stress Relaxation Test Method", the test process is automatically controlled, data collected, displayed, and saved based on the set test parameters (main parameters: test force, relaxation force, relaxation rate or logarithmic relaxation rate, temperature). After the test is completed, the data can be analyzed and processed, and user required test curves and reports can be printed out. Various standard required test curves can be selected (residual test force or logarithmic residual force, relaxation force or logarithmic relaxation force, relaxation rate or logarithmic relaxation rate, temperature, etc. can be plotted as relationship curves with time or logarithmic time).
Computer software based onWindows98/Windows2000/Windows XPPlatform development, beautiful interface,Easy to operate; Test force and deformation display are displayed using configuration instruments,Very eye-catching; Embedded database,Easy to trace data history and meet networking requirements; The report is operated using a template method,Users only need simple training to master it, and the entire software has strong encapsulation,Easy to operate and comprehensive in functionality; There is a standard test procedure, and by pressing the shortcut key, the test system can be operated according to the standard requirements3-5Load the steel strand with the nominal maximum force within minutes70%perhaps80%Maintain it2Automatically start recording test data after minutes and automatically terminate the test after reaching the set time.
4、 The correlation coefficient between the experimental curve and the theoretical fitting curve reaches99%Above, therefore it can be used100Calculation of hourly experimental data1000Hourly relaxation rate and simulated display1000The hourly recursive curve has shortened the actual experimental time.
5、 The testing machine adopts specialized sensors for steel strands, which have strong resistance to relaxation and creep, and small zero drift under long-term stress.
6After the test force reaches the set value, the host power can be turned off to reduce energy consumption.
7During the experiment, if there is a power outage, the test data will not be lost, and the experiment can continue after the power is restored.
8Build a powerful experimental database, where experimental data can be saved, queried, and accessed at any time
2、 Main technical indicators:
1Maximum test force:300kN/600KN
2Test force measurement range:6-300kNThe whole process is not divided into stages
3Creep of load sensor: 30Within minutes≤0.02%
4Test force accuracy: superior to±1%
5Test force resolution: for each level of measurement range0.05%/FS
6Speed adjustment range:0.01-50mm/min.
7Resolution of deformation measurement:0.001mm
8Sample specifications(Nominal diameter)：；Φ11.10；Φ12.70；Φ15.20mm; Φ17.8mm
9Tensile test stroke:0-200mm
10Test tensile space:800-1000mm
11Protection function: Exceeding maximum test force2%-5%Automatically stop the machine.
12Main unit form of testing machine:Vertical structure.
13Power: Three phase five wire380v；3.0KW
14Host size(L•W•H):900x710x3000mm
3、 Basic configuration
1Relaxation testing machine host(300kN/600KNVertical) One unit
2Panasonic Communication Servo Motor from Japan a set
3Communication servo motor speed control system a set
4High precision load sensor for relaxation testing machine（300kN/600KN） a set
5Relaxing attachments:Φ11.10；Φ12.70；Φ15.24mm; Φ17.8mm a set
6Lenovo Computer One unit
7Laser printer(A4HP1106) One unit
8Special software for relaxation testing machine a copy
9Microcomputer desk one
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