Tensile testing machine performance indicators and detailed technical parameters

The tensile tester is a test method for determining the characteristics of a material under an axial tensile load. The data obtained from the tensile test can determine the material's elastic limit, elongation, elastic modulus, proportional limit, area reduction, tensile strength, yield point, yield strength, and other tensile properties. Creep data can be obtained from a tensile test conducted at a high temperature. The steps of the metal tensile test can be found in the ASTM E-8 standard. For methods of plastic tensile testing, see ASTM D-638 , D-2289 (high strain rate) and D-882 (sheet). The ASTM D-2343 standard specifies a tensile test method for glass fibers; ASTM D-897 standard specifies a tensile test method for adhesives; ASTM D-412 specifies a tensile test for hard rubbers. method. Tensile test can also be called tensile test.
The test of a series of properties of a material under tensile load is also called a tensile test. It is one of the basic methods for testing the mechanical properties of materials. It is mainly used to test whether materials meet the required standards and study the properties of materials.
Performance

Tensile testing can determine a series of strength and plasticity indicators of a material. Intensity generally refers to the ability of a material to resist elastic deformation, plastic deformation, and fracture under external forces. When a material is subjected to a tensile load, the phenomenon of significant plastic deformation continues to occur when the load does not increase, known as yielding. The stress at yield is called the yield point or the physical yield strength, expressed as σS (Pa). There are many materials in the project without obvious yield point. Usually, the residual plastic deformation of the material is 0.2 % as the yield strength, and the conditional yield limit or the condition yield strength is expressed as σ0.2 . The maximum stress value that the material reaches before breaking, called the tensile strength or strength limit, expressed in σb (Pa).
Plasticity refers to the ability of a metal material to undergo plastic deformation under load without causing damage. Commonly used plastic indicators are elongation and area shrinkage. Elongation Elongation known, refers to a material sample by broken after tensile load, the total elongation percentage ratio with the original length, expressed by δ. Reduction of the percentage refers to a material specimen under tension Hela rear carrier, with the original cross-sectional area of the reduced cross-sectional area ratio, represented by ψ.
The conditional yield limit σ0.2 , the strength limit σb , the elongation δ, and the area shrinkage ψ are the four performance criteria that are often determined in a tensile test. In addition, the material's elastic modulus E , proportional limit σp , elastic limit σe, etc. can also be measured.
Test Methods Tensile tests were performed on a material testing machine. Test machines are of the mechanical, hydraulic, electrohydraulic or electronic servo type. The sample type can be a full-section material, or can be processed into a round or rectangular standard sample. Some physical samples, such as steel bars and wire rods, generally do not need to be processed to maintain their full sections for testing. Sample preparation should avoid the influence of cold and hot processing on the material structure and guarantee a certain degree of finish.
During the test, the tester stretches the sample evenly at a specified rate, and the tester can automatically draw a tensile curve. For materials with good plasticity such as low-carbon steel, when the specimen is stretched to the yield point, the measurement pointer has obvious jitter and the upper and lower yield points (and) can be separated. When calculating, it is often used. The δ and ψ of the material can be assembled by testing the fractured specimens and measuring their elongation and reduction of the cross section and calculating them.
Stretching technical standards

GB/T 12914-1991 "The determination of the tensile strength of paper and board (Constant-speed drawing method)" requirements design. Also refer to GB 13022-91 , GB/T1040-92 , GB2792-81 , GB/T 14344-9 , GB/T 2191-95 , QB/T 2171-95 GB 13022 , GB 8808 , GB 1040 , GB 4850 , GB 7753 , GB 7754 , GB 453 , GB/T 17200 , GB/T 16578 , GB/T 7122 , GB/T 2790 , GB/T 2791 , GB/T 2792 , ASTM E4 , ASTM D828 , ASTM D882 , ASTM D1938 , National and industrial standards such as ASTM D3330 , ASTM F88 , ASTM F904 , ISO 37 , JIS P8113 , QB/T 2358 , QB/T 1130, etc.

 

Tensile machine features

 

1. Transmission mechanism adopts ball screw, transmission is stable and accurate; imported servo motor is used, low noise, precise control

2. Large-screen LCD display, Chinese menu. Real-time display of force - time, force - deformation, force - displacement, etc. during the test; the latest software has the ability to display the tensile curve in real time; the instrument has powerful data display and analysis and management capabilities.

3. Using 24 -bit high-precision AD converter (resolution up to 1 / 10,000,000 ) and high-precision load cells to ensure the rapidity and accuracy of instrument force data collection

4. The use of modular integrated printer, easy installation, low failure; thermal printer.

5. Direct measurement results: After completing a set of tests, it is easy to directly display measurement results and print statistical reports, including the average value, standard deviation, and coefficient of variation.

6. High degree of automation: The instrument design uses advanced devices at home and abroad, and the microcomputer performs information sensing, data processing, and motion control, and features automatic reset, data memory, overload protection, and fault self-diagnosis.

7. Multi-function, flexible configuration:

      Tensile testing machine parameters:
1 , the maximum test force: 50N , 100N to 20KN
2 , accuracy rating: 0.5 / 1
3 , test force measurement range: 0.2% to 100% FS / 0.4 to 100% FS
4. Accuracy of test force indication: ±0.5%/±1%
5 , test force resolution: ± 250000 yards
6 , large deformation measurement range: 0 to 800mm
7 , large deformation accuracy: ± 0.5%
8 , large deformation resolution: 0.003mm
9. Accuracy of displacement indication: ± 0.3%
11 、, displacement resolution: 0.00004mm
12 , force rate control adjustment range: 0.005-10% FS / S
13 , force rate control accuracy: force control rate of less than 0.05% , FS / S when ± 1% ; force control rate is greater than 0.05% , FS / S at ± 0.3% ;
14 , elongation rate control adjustment range: 0.005-10% FS / S
15 , the elongation rate control accuracy: the deformation control rate is less than 0.05% , FS / S at ± 0.5% ; deformation control rate is greater than 0.05% , FS / S at ± 0.2% ;
16 , displacement rate control adjustment range: 0.001-1000mm/min
17 , displacement rate control accuracy: ± 0.2% / ± 0.5%
18 , constant force, constant deformation, constant displacement control range: 0.3% - 100%FS
19 , constant force, constant deformation, constant displacement control accuracy: set value is less than 10% , FS when ± 0.5% ; set greater than 10% , FS when ± 0.1% ;
20 , effective stretching space: 900mm
21 、Effective test width of electronic tensile testing machine: 400mm .