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E-mail
973654827@qq.com
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Phone
13402079333
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Address
208 Andong Road, Wuqiao Town, Fengxian District, Shanghai
Shanghai Qingji Instrument Technology Co., Ltd
973654827@qq.com
13402079333
208 Andong Road, Wuqiao Town, Fengxian District, Shanghai
The overall accuracy of electronic tensile testing machines is higher than that of hydraulic tensile testing machines. The difference in accuracy between the two is due to the essential differences in power drive, control mode, and applicable scenarios. The specific comparison and reasons are as follows:
The root cause of differences in core accuracy
comparative dimension |
Electronic tensile testing machine |
Hydraulic tensile testing machine |
Drive Type |
servo motor+Ball screw, mechanical transmission chain is short and rigid |
hydraulic pump station+Hydraulic cylinder, relying on pressure transmission of hydraulic oil |
Control Theory |
Closed loop servo control, capable of real-time feedback of force values, displacement, and strain data, with fast response speed (in milliseconds) |
The hydraulic valve control system has hysteresis in pressure transmission and is susceptible to fluctuations in oil temperature and pressure |
Force accuracy |
Universal reachLevel 0.5, some models can reach level 0.3, with an indication error of ≤± 0.5% |
mostlyLevel 1, indication errorfor≤± 1%, significant accuracy attenuation in low load range |
Rate accuracy |
Wide speed range（0.001~500mm/min）， Rate fluctuation ≤± 0.5% |
Narrow speed range, prone to crawling phenomenon at low speeds, and significant speed fluctuations |
Differences in Magnification Accuracy for Applicable Scenarios
Electronic tensile testing machine focuses on small and medium-sized loads（≤100kN）、 High precision testing, suitable for tensile, peel, and tear tests of non-metallic materials such as plastics, rubber, and films. This type of experiment requires high force resolution and rate stability in the low load range, and the servo control of electronic models can accurately capture key indicators such as yield point and elastic modulus.
Hydraulic tensile testing machine focuses on large loads（≥100kN）、 High load testing, suitable for tensile and compressive testing of metal bars, steel bars, and large components. The core requirement for such experiments is "high loading force and strong stability", rather than high precision. The impact of pressure fluctuations in hydraulic systems on the results of high load tests can be ignored.
Special circumstances indicate that a small number of hydraulic universal testing machines can improve accuracy by installing high-precision servo valves and digital control systems0.5 level, but the cost is much higher than electronic tensile testing machines of the same accuracy, and the accuracy in the low load range is still inferior to electronic models.