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E-mail
qingjiyiqi@zhongguoqingji.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
qingjiyiqi@zhongguoqingji.com
13402079333
208 Andong Road, Wuqiao Town, Fengxian District, Shanghai
The technical parameters of the universal testing machine are the core basis for selection, testing compliance, and data accuracy. It needs to be developed around the five core dimensions of "load capacity, measurement accuracy, control performance, structural adaptation, and functional expansion". The following is based on industry standards（GB/T 16491TheISO 7500-1）Compared to actual application scenariosDetailed explanation of key technical parameters, covering mandatory parameters, optional parameters, and selection references:
1、 Core mandatory parameters (determine the basic performance of the equipment and must be clearly defined)
1. Load related parameters (core in the core, directly affecting the testing range)
parameter name |
Definition and Explanation |
Selection reference standards |
Maximum test force (range) |
The maximum load that the equipment can stably apply (unit:N/kN）, such as10kNThe50kNThe1000kN |
Test the maximum force on the material×1.2~1.5Choose (such as plastic stretching maximum)5kN, choose10kNMaximum compressive strength of concrete800kN, choose1000kN） |
Accuracy level of force value |
Accuracy of force measurement (mainstream) 0.2 Level0.5 Level1 Grade) |
R&D/Third party testing selection 0.5 Grade and above; Routine quality inspection selection 1 level |
Relative error of force value indication |
Percentage deviation between measured force value and standard force value（0.2 level≤±0.2%，0.5 level≤±0.5%，1 level≤±1.0%） |
It is necessary to meet the standard requirements of the corresponding accuracy level, and the calibration report should clearly indicate that the error of each load point meets the standard |
Repeatability of force values |
The fluctuation range of repeated testing at the same load point（0.2 level≤0.1%，0.5 level≤0.25%，1 level≤0.5%） |
Reflecting device stability and avoiding excessive data dispersion |
Force resolution |
The minimum force value that the device can display (unit:)N）, such as0.01NThe0.1NThe1N |
Micro force testing (such as electronic component peeling) selection≥0.01NHigh load testing (such as steel bar tension) selection≥0.1N |
Payload range |
The load range where the accuracy of the force value meets the standard (usually the rated load)1%~100%、 0.2 Level of equipment available0.2%~100%） |
Ensure that the test load falls within the specified range (e.g10kNEquipment testing100N~10kNTo avoid exceeding the error limit under small loads |
2. Displacement related parameters (affecting the accuracy of deformation data and adapting to different sample deformation amounts)
parameter name |
Definition and Explanation |
Selection reference standards |
Maximum test travel |
The maximum distance that the crossbeam can move (unit:mm）, such as500mmThe1000mmThe1500mm |
Maximum deformation of the covered sample/Compression amount (such as plastic film stretching selection)1000mmConcrete compression selection500mm） |
Displacement accuracy |
Measurement error of beam movement distance（0.5 Grade equipment≤±0.5%±1Mm，1 level≤±1.0%±1Mm） |
Match with the accuracy level of force values to avoid distortion of deformation data |
Displacement resolution |
The minimum displacement that the device can display (unit:mm）, such as0.001mmThe0.01mm |
Selection of high elasticity materials (such as rubber)≥0.001mmSelection of Conventional Materials≥0.01mm |
Test speed range |
Speed range of crossbeam movement (unit:mm/min）, such as0.001~500mm/minThe0.01~1000mm/min |
Match testing standards (such as metal tensile testing)0.05~5mm/minRubber stretching50~500mm/min） |
Speed accuracy |
Percentage deviation between actual speed and set speed (usually≤±1%） |
Ensure stable loading speed and avoid test results being affected by speed fluctuations |
3. Deformation measurement parameters (for scenarios that require precise measurement of sample deformation, such as yield strength and elastic modulus)
parameter name |
Definition and Explanation |
Selection reference standards |
Extensometer gauge length |
The reference length for measuring the deformation of a specimen using an extensometer (unit:)mm）, such as25mmThe50mmThe100mm |
Select according to testing standards (such as commonly used for metal stretching)50mmCommonly used textiles200mm） |
Range of extensometer |
The maximum deformation that an extensometer can measure (unit:)mm）, such as5mmThe10mmThe50mm |
Covering the maximum deformation of the specimen (such as rubber fracture elongation)500%, gauge length50mmNeed to choose≥25mmRange extensometer |
Deformation accuracy |
Measurement error of sample deformation (conventional)≥±0.1%, reachable±0.05%） |
When testing yield strength and elastic modulus, it must be configured with an accuracy higher than the equipment force value accuracy |
Deformation resolution |
The minimum deformation that an extensometer can display (unit:)Mm）, such as 0.1MmThe1Mm |
Selection of Elastic Modulus Testing for Metal Materials≥0.1MmSelection of Conventional Deformation Testing≥1Mm |
4. Control performance parameters (determining test mode flexibility and stability)
parameter name |
Definition and Explanation |
Selection reference standards |
control mode |
Supported loading control methods (force control, displacement control, deformation control, three loop control) |
R&D/Choose three closed-loop control for complex testing; Conventional quality inspection selects displacement control+Power control is sufficient |
sampling frequency |
Equipment collects force values/displacement/Frequency of deformation data (unit:Hz）, such as1000HzThe2000HzThe5000Hz |
Dynamic testing (such as impact and fatigue) selection≥2000HzConventional static testing selection≥1000Hz |
Closed loop control response time |
Time for feedback and adjustment of control signals (unit:ms）, such as≤10ms、≤20ms |
The faster the response, the more precise the control (such as capturing the yield point more accurately in deformation control mode) |
2、 Structural and environmental adaptation parameters (affecting equipment installation and stability of use)
parameter name |
Definition and Explanation |
Selection reference standards |
Drive Type |
Power source (electronic servo, hydraulic, electro-hydraulic servo) |
Medium to low load+High precision electronic servo selection; High load（≥1000kN）Choose hydraulic; Research and development of electro-hydraulic servo |
Rack stiffness |
The ability of the rack to resist deformation (unit:kN/mm）, such as≥500kN/mm、≥1000kN/mm |
High load testing (such as concrete compression and steel plate bending) selection≥1000kN/mmTo avoid rack deformation affecting accuracy |
Workbench dimensions |
The length of the equipment workbench×Width (unit:mm）, such as500×500mmThe800×800mm |
Adapt to large-sized specimens (such as concrete blocks and large slabs) to ensure stable placement of the specimens |
Equipment external dimensions |
long×wide×High (unit:mm）, such as1200×600×1800mmThe2000×1000×3000mm |
Combining laboratory space selection to avoid being unable to operate after installation |
Equipment weight |
Total weight of equipment (unit:kg）, such as200kgThe500kgThe2000kg |
High load hydraulic presses require confirmation of laboratory floor load-bearing capacity (usually≥500kg/㎡） |
Work environment requirements |
Temperature, humidity, power conditions (such as temperature)10~35℃, humidity≤85%, power supply220V/380V） |
Ensure that the laboratory environment meets the requirements and avoid temperature fluctuations/humidity/Vibration affects equipment accuracy |
noise level |
Noise during equipment operation (unit:dB）, electronic servo type≤60dB, hydraulic type≤85dB |
The laboratory environment is sensitive to noise and electronic servo type is selected |
3、 Function extension parameters (selected as needed, adapted to special testing requirements)
parameter name |
Definition and Explanation |
Applicable scenarios |
Experimental mode support |
Types of achievable tests (tension, compression, bending, shear, peeling, tearing, fatigue, etc.) |
third-party testing/Research and development require multiple modes; Conventional quality inspection requires basic mode (stretching)+Compression) |
Fixture compatibility |
Supported fixture types (flat mouth, wedge, pneumatic, vacuum, specialized fixtures) |
Metal wedge-shaped fixtures; Flat mouth anti slip fixtures for textiles; Vacuum fixtures for micro force testing |
Attachment integration capability |
Scalable accessories (high and low temperature chambers, humidity chamber, video extensometer, fatigue module, piercing head) |
High and low temperature testing requires high and low temperature chambers; Fatigue testing requires a fatigue module |
Software features |
Standard Library（GB/ISO/ASTM）Data export（Excel/PDF）Curve analysis, audit tracking, report customization |
Testing agencies need to audit and track; R&D requires curve overlay comparison and data traceability |
Security protection function |
Overload protection (such as110%Rated load shutdown, limit protection, emergency stop button, leakage protection |
All scenarios to avoid equipment damage or personnel injury |
Data storage capacity |
Storable test data/Number of reports (such as 10 Ten thousand sets, unlimited) |
Batch testing scenarios require large capacity storage and support data backup |
communication interface |
Data transmission interface（USBEthernetRS232） |
Need to connectLIMSSelect Ethernet interface for the system (laboratory information management system) |
4、 Parameter differences of different drive types of equipment (selection reference)
parameter dimension |
Electronic servo universal testing machine |
Hydraulic universal testing machine |
Electro hydraulic servo universal testing machine |
Maximum load range |
0.01N~500kN |
100kN~10000kN |
50kN~5000kN |
Accuracy level of force value |
0.2 level/ 0.5level/ 1level |
1 Grade（ 0.5 Grade) |
0.5 level/ 1level |
Test speed range |
0.001~500mm/min |
0.01~100mm/min |
0.001~200mm/min |
Displacement accuracy |
±0.5%±0.5Mm（0.5 Grade) |
±0.5%±1Mm（0.5 Grade) |
±0.5%±0.5Mm（0.5 Grade) |
Rack stiffness |
≥500kN/mm |
≥1000kN/mm |
≥800kN/mm |
noise level |
≤60dB |
≤85dB |
≤70dB |
5、 Core principles for parameter selection
Meet the mandatory requirements of the standard firstPriority confirmation of testing standards (such asGB/T 228TheISO 178）Low requirements for force accuracy, displacement accuracy, and testing speed, followed by parameter matching;
Load and travel allowance: Range=Maximum test load×1.2~1.5, itinerary=Maximum deformation of the sample×1.3~1.5To avoid unstable testing under extreme values;
Accuracy and requirement matchingR&D/Testing selection 0.5 level+High resolution; Routine quality inspection selection 1 level+Basic resolution to avoid excessive pursuit of high precision leading to cost waste;
Non redundant functionalityOnly basic testing (stretching) is required+Compression), without the need to choose models that support fatigue and impact; Special environmental testing (such as low temperature) is required to confirm the compatibility of attachments in advance.
summary
The core technical parameters of the universal testing machine are concentrated in five dimensions: load, displacement, deformation, control, and structureMaximum test force, force value accuracy, maximum stroke, test speed rangeIt is a key parameter that must be considered for selection, and the deformation measurement parameters (related to extensometers) need to be determined based on whether the yield strength and elastic modulus are tested to determine whether to configure them. In actual selection, it is necessary to combine testing materials, industry standards, and usage scenarios, prioritize ensuring that core parameters meet standards, and then select extended functional parameters as needed to ensure that the equipment meets testing requirements and has high cost-effectiveness.