WDW-100 Dual-Column Microcomputer-Controlled Video Extensometer Electronic Universal Tensile Testing Machine

Product Introduction:

The WDW-100 dual-column microcomputer‑controlled video extensometer universal testing machine is a next‑generation, microcomputer‑based electronic universal testing system specially designed for universities and research institutes. The computer system employs a fully digital controller to drive a servo motor via a speed‑regulation system; after deceleration through a reduction gear set, the motion is transmitted via a precision ball‑screw assembly to raise or lower the crossbeam, enabling tensile, compressive, bending, shear, and other mechanical property tests. Additionally, it can be equipped with a wide variety of test fixtures, offering broad application prospects in the mechanical performance evaluation of metals, nonmetals, composite materials, and related products. This machine is extensively used for material testing and analysis across industries such as construction materials, aerospace, machinery manufacturing, wire and cable, rubber and plastics, textiles, and home appliances, making it an ideal testing instrument for research institutions, higher education establishments, industrial and mining enterprises, technical supervision agencies, and commodity inspection and arbitration bodies. It complies with the following standards: GB/T 3354‑2014 “Test Method for Tensile Properties of Oriented Fiber‑Reinforced Polymer Matrix Composites,” GB/T 2611 “General Technical Requirements for Testing Machines,” JB/T 7406.1 “Terminology for Testing Machines—Material Testing Machines,” and GB/T 16491 “Electronic Universal Testing Machines.”

Technical Specifications:

Product Solution Description:

(1) Host Machine

1.1 The main unit features a floor-mounted frame structure, offering high strength, minimal deformation, and an elegant, aesthetically pleasing appearance.

1.2 Employs imported high-precision ball screws for efficient and smooth transmission;

1.3 Employs a high-precision spoke-type load cell, offering high measurement accuracy and excellent stability.

1.4 The transmission system employs an arc-tooth synchronous belt drive, ensuring backlash-free operation in both directions during transmission.

1.5 Employs an AC servo motor and drive system to ensure smooth transmission and stable torque, equipped with protection features against overcurrent, overvoltage, and overload; the speed regulation ratio can reach as high as 1:100,000.

1.6 The fixture is specially designed to provide secure clamping, convenient operation, and eliminates jaw slippage.

1.7 Special manufacturing processes ensure the coaxiality of the testing machine, effectively eliminating the influence of irregular specimens on the sensor.

(II) Control System

The STC300 all-digital closed-loop measurement and control system boasts numerous advanced features and technological innovations, primarily reflected in:

1. Four closed-loop control modes have been implemented: test force, specimen deformation, crosshead displacement, and the testing process.

2. The data acquisition system comprises four high-precision 24-bit A/D conversion channels, with a maximum resolution of 1/300,000 and no channel switching throughout the entire measurement range.

3. Uses original, branded integrated circuits from BB, AD, Xilinx, and other leading manufacturers; fully digital design.

4. Complies with the PCI bus standard; the microcomputer automatically recognizes and installs it, enabling “plug-and‑test” functionality.

5. The electronic measurement system contains no analog components such as potentiometers, ensuring interchangeability and facilitating maintenance and replacement.

(3) Video Equipment Description

A video extensometer is a non-contact, high-precision, real-time measurement system that employs a single digital camera and real-time image-processing algorithms. By capturing images of the specimen during testing and analyzing changes in image features, it can dynamically measure strain, displacement, and other parameters in real time. It interfaces with the testing machine’s signals to determine stress–strain curves and various other mechanical property parameters, making it suitable for a wide range of mechanical tests.

Features of Video Extensometers

• Non-contact measurement: eliminates the additional measurement errors introduced by contact-based methods such as strain gauges and clip-on extensometers.
• Full‑process tracking: No downtime is required throughout the entire procedure, and specimen fracture will not damage the measurement system, enabling end-to-end traceability.
• Diverse experimental scenarios: In addition to general-purpose settings, it can also accommodate specialized tests involving large deformations, minute deformations, and extreme temperatures.
• Wide material compatibility: Virtually no restrictions on materials; testing can be performed on specimens of various sizes and compositions.
• Sub-pixel measurement accuracy: Based on image-processing correlation methods, the calculation accuracy reaches the sub-pixel level.
• Wide strain range: The measurable strain range spans from 0.002% to over 1000%, far exceeding that of conventional methods.
• Gauge Length Customization: Customize the gauge length to any value within several hundred millimeters.
• Multi-directional simultaneous measurement: Enables concurrent calculation of longitudinal and transverse strains.
• Multi-point simultaneous measurement: Enables strain measurement at multiple points, suitable for multi-specimen testing and multi‑segment testing, among other applications.
• Full-field strain measurement: Supports real-time and offline 2D full-field strain measurement, enabling analysis of various strain and displacement field data.

(4) Control Software:

• It complies with the relevant provisions of more than thirty national standards, including GB/T 2611 and GB 228-2021, and can perform tests and process data according to a variety of standards such as GB, ISO, JIS, ASTM, DIN, as well as user‑provided specifications, while also offering excellent scalability.
• 1. The computer control system boasts high integration, stable performance, and convenient adjustment. It enables real-time acquisition of experimental data and provides dynamic, real-time display of experimental characteristic curves. Experimental data files can be saved in either the widely used Access database format or the more robust SQL Server database, facilitating resource sharing and network management for clients, as well as subsequent user analysis. Moreover, the software seamlessly supports user‑defined Word 2000–style reports, addressing the challenge of varying reporting requirements across different users or within the same user at different times. The system can process raw data for test force, displacement, and time, as well as derived curves.
• 2. Protection Features: This machine is equipped with both software‑based and mechanical limit‑protection mechanisms, with the percentage of automatic shutdown upon exceeding the maximum load dynamically adjustable; it also incorporates multiple protection functions, including overcurrent, overvoltage, and overload protection.
• 3. The load channels can be automatically labeled, providing intuitive and convenient visualization.
• 4. Batch testing enables hierarchical display of curves and automatic curve tracking.
• 5. This software allows users to set custom speeds and adjust them via the computer. It also supports high-precision speed calibration, enabling real-time adjustment of speed levels and encoders.
• 6. Monitoring the testing process: Real-time display of various parameters, including test force, displacement, and load–displacement curves, is available during the test.
• 7. Software Permission Hierarchical Management Function: To enhance the security of the software and its data, this software supports role-based access control by configuring distinct password protections.
• 8. Result Reproduction Function: After completing the test procedure and saving the data, users can reopen the results at any time to re-analyze the experimental data as needed.
• 9. Users can select load–time, load–displacement, displacement–time, and other curves as needed for testing, with corresponding display, storage, analysis, and printing capabilities.
• 10. Point-by-point traversal of the curve: Users can click on the curve with the mouse to obtain the force and deformation values at each point, thereby calculating various parameters for every location.
• 11. Result Comparison Function: Allows simultaneous viewing of multiple test curves and enables comparison of the characteristics of samples under analysis through curve superposition and local magnification.
• 12. Force Interface: The force-channel interface and test software can be equipped with various sensors according to user requirements, and support calibration, parameter modification, and routine testing.
• 13. Data sampling frequency: A high-speed sampling rate can be selected according to the user’s test requirements.

Basic configuration:

• 1. Testing machine mainframe (floor-mounted frame structure)
• 1.1 AC Servo Motors and Servo Drives
• 1.2 High-Precision Load Sensor
• 1.3 Imported precision ball screw assemblies
• 1.4 Reduction System (Arc-tooth Synchronous Belt Drive)
• 2. Dual-channel programmable amplifier, resolution 1/500,000
• 3. LT-specific control software
• 4. Standard fixtures include: one set of tensile grips (a hydraulic automatic tensile grip is available as an option).
• 5. Video Extensometer
• 6. Lenovo-brand computers
• 7. HP A4 Inkjet Printer
• 8. Technical Documentation: User Manual, Software User Guide, Certificate of Conformity, Packing List