NKPL-W20KN Computer-Controlled Electronic Tension and Compression Fatigue Testing Machine

System Composition

1. Floor-Standing Gantry-Type Movable Loading Platform

Designed with a two-column gantry frame, crossbeam structure, and manual locking mechanism. Equipped with four vibration-absorbing foot pads at the base. Large-diameter columns provide high frame strength.

2. Servo Actuator and Drive System （Single Channel）

The actuator features a maximum effective stroke of ±50 mm and includes a high-precision digital displacement sensor. Buffer zones are designed at stroke limits to avoid damage from uncontrolled motion.

The drive system includes backlash elimination and automatic force centering to reduce lateral force and impact during high-frequency tension testing, effectively improving waveform quality.

3. Data Acquisition and Control System

Composed of a single-channel fully digital servo controller for static and dynamic control, a computer with software, and associated accessories.

4. High-Precision Load Cell

Equipped with a high-precision load sensor rated for 120% overload capacity. Mounted at the front end of the actuator piston, with a self-locking nut. Sensors are calibrated before delivery.

5. Sample Mounting Capacity

· For springs with maximum test force of 5000–10000 N: 2 specimens per test

· For springs with test force ≤5000 N: 4 specimens per test

· For springs with test force ≤200 N: 10 specimens per test

System Functions

Fatigue Performance Testing of Material Specimens:

1. Fatigue Control Mode 1: Constant Deformation Control

· Force–Time curve

· Deformation amplitude–Cycle curve

· Sinusoidal waveform

2. Fatigue Control Mode 2: Constant Force Control

· Deformation–Time curve

· Force amplitude–Cycle curve

· Sinusoidal waveform

3. Fatigue Control Mode 3: Programmable Control

· Test steps can be freely defined

· Supports T-wave testing

4. Software Supports Test Frequency of 20 Hz

· Actual frequency varies based on sample deformation; larger deformation may reduce frequency.

5. Real-Time Data Acquisition up to 20 kHz

6. Evaluation Criteria

· Based on number of load cycles, deformation amount, or force decay to determine pass/fail status of the sample （e.g., spring）.

7. Automatic Stop & Resume

· System automatically stops when sample fails or force decays to a preset threshold.

· If the test is not completed in one day, it can resume the next day seamlessly.

Static Performance Testing of Material Specimens:

1. Automatic Display: Real-time display of test force, peak value, and test status during the test.

2. Automatic Coordination: Displacement and force values are automatically synchronized during testing.

3. Automatic Operation: After inputting test parameters, the system can complete the test process automatically.

4. Automatic Return: After the test, the system can return to the initial position automatically.

5. Automatic Calculation: Upon test completion, results such as tensile （or compressive） strength and elongation are calculated automatically.

6. Automatic Data Storage: Test data and curves are automatically saved to the computer.

7. Easy Querying: Previous test data can be retrieved via a simple query function.

8. Result Printing: Test results can be printed via printer.

9. User-Friendly Operation: Menu-driven interface for intuitive and straightforward operation.

10. Comprehensive Functions: With the appropriate fixtures, the machine can perform tensile, compression, bending, tearing, peeling, and other tests.

11. Dynamic Curves: Displays real-time dynamic curves during the test process.

12. Fracture Detection: The system can automatically return to the starting position after specimen failure.

13. Condition Storage: Test control settings and specimen parameters can be saved as modules for batch testing.

14. Auto Speed Adjustment: Test speed can change automatically according to a preset program during the test.

15. Process Integration: Test process, measurement, display, and analysis are fully managed by the computer.

16. Batch Testing: Once parameters are set, multiple tests with identical settings can be executed sequentially.

17. Curve Analysis: After testing, the curve can be analyzed point by point using a mouse to check data values at any point.

18. Curve Selection: Supports display and printing of force–displacement, force–time, and displacement–time curves.

19. Test Report: The test report can be generated in user-defined formats and printed as a report form.

Main Performance Specifications:

1. Maximum Test Force: ±20 kN

2. Force Resolution: 0.01 kN

3. Accurate Measurement Range of Force: 2%FS–100%FS

4. Dynamic Force Indication Fluctuation: ±1%FS

5. Static Force Accuracy: ±0.5%FS

6. Test Space （L×W×H）: 300 mm × 500 mm × 500 mm （without fixtures）

7. Displacement Resolution: 0.001 mm

8. Stroke Amplitude: ±10 mm

9. Frequency: 0.1–10 Hz （Note: Large deformation reduces frequency according to amplitude-frequency characteristics）

10. Waveforms: Sine wave, triangle wave, square wave

11. Display: Computer screen display

12. Machine Dimensions (L×W×H): Approx. 900 × 600 × 2500 mm

13. Weight: Approx. 800 kg

14. Power Supply: 220V, 5 kW

Main Equipment Configuration:

No.Component NameUnitQuantity

1 Testing Machine Host Set 1

2 Panasonic Servo Motor （Japan） Unit 1

3 Panasonic Servo Driver（Japan） Set 1

4 High-Precision Servo Actuator Set 1

5 AMTI High-Precision Load Sensor (USA) Pcs 1

6 NAKE Precision Data Acquisition System Set 1

7 NAKE Dedicated Fatigue Testing Software Set 1

8 ASUS Commercial Computer Unit 1

9 ASUS Monitor Unit 1

10 HP Inkjet Printer Unit 1

11 Testing Tools Set 1

12 Dedicated Fatigue Test Cables Set 1

13 One copy each of User Manual, Certificate, and Packing List Set 1

Data Acquisition and Control System Description

System Composition:

The control system consists of a fully digital servo controller, computer, software, and related accessories.

The single-channel fully digital servo controller （including software） serves as the system’s core control unit. This control system is independently developed by our company and represents an advanced testing platform that ensures both technical advancement and operational reliability.

1. Main Components of the Controller:

· Upgradeable main controller unit

· Signal conditioning unit with dual sensor support （force and displacement; expandable）

· Signal generator module

· HS-GPIB communication card for interfacing with the PC

2. Main Technical Specifications of the Control System:

· Control Unit: Fully digital PIDF control using any input signal

· Frequency Range: 0.1–20 Hz

· Control Waveform: Sine wave

· Control Modes: Closed-loop force control and displacement control, with seamless and disturbance-free switching between modes

· The system supports sensor calibration, zeroing, and other functions

· High-speed data acquisition via GPIB card; maximum data transmission speed: 8 MB/s

3. Key Controller Features:

· Comes with multiple optional application software packages to suit various testing needs. These software tools share a consistent design, allowing users to quickly learn and operate different modules.

· Built-in calibration wizard guides users through automatic or manual calibration processes.

· Implements advanced techniques in dynamic test control and data acquisition to enhance accuracy and quality, such as:

· Adaptive control

· Automatic waveform loop setup

· Amplitude control

· These features ensure high reliability and precision of both tests and results.

· The software system is fast and flexible, meeting a wide range of testing requirements. All functions are integrated into minimal interface windows. Data, graphs, and figures can be exported to other Windows applications, allowing users to create customized reports.

· The controller uses high-resolution feedback sampling and signal regulation technology, bringing the performance of digital servo controllers to a new level.

· Continuous full-range measurement ensures accurate and repeatable data across the entire sensor range.

· The system is easily expandable, allowing future upgrades as user requirements grow. New control channels can be added to extend capabilities and protect the user’s long-term investment.

· The software provides an intuitive method to build and run tests, automatically generating test steps for fully automated control.

· Various compensation techniques optimize control, even for demanding or complex tests.

· The controller’s channel supports multiple control modes with seamless transitions between them. It also includes:

· Fluctuation-free startup

· Auto zeroing

· Save/restore PID settings

· Save/restore test files

· Auto data acquisition

· Real-time specimen protection during tests

Software System

The software system supports both Chinese and English language interfaces.

It provides full functionality for test definition, execution, analysis, and reporting.

Sample Report Template （Reference）

Material Fatigue Test Report

Test OrganizationShandong Nake Test Equipment Co., Ltd.

Specimen No. 20210420003

Test Time 0:20:00

Specimen Size —

Test Waveform Sine

Max Force （Peak）)2101.1 N

Min Force （Valley） 9.3 N

Test Frequency 3.83 Hz

Number of Cycles 1000

Test Operator —

Working Environment Requirements for the Testing Machine

1. The machine must be installed properly on a solid foundation or workbench.

2. It must operate in an environment free of vibration, corrosive media, and strong electromagnetic interference.

3. Power supply voltage fluctuations must not exceed ±10% of the rated voltage.