Tuofeng TFW-257 Microcomputer-Controlled Electronic Universal Testing Machine
| Brand | Tuofeng |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Model | TFW-257 |
| Instrument Type | Electromechanical Universal Testing Machine |
| Standard Compliance | GB/T 16491-2008, JJG 475-2008, ASTM E4, ISO 7500-1, DIN 51221, JIS B 7721 |
| Load Capacity | 25 kN (configurable up to 200 kN) |
| Accuracy Class | 0.5 |
| Effective Force Range | 0.2–100% of full scale |
| Force Measurement Uncertainty | ±0.005% of reading |
| Resolution | 1 part in ±500,000 full-scale codes (single-range, no auto-ranging) |
| Drive System | Imported servo motor with precision worm-gear reducer |
| Lead Screw | High-precision preloaded ball screw |
| Effective Test Width | 400 mm (expandable to 600 mm) |
| Maximum Travel | 800 mm (height-adjustable) |
| Speed Range | 0.001–500 mm/min (infinitely variable, closed-loop controlled) |
| Displacement Measurement | Optical encoder |
| Displacement Accuracy | ±0.005% of reading |
| Strain Measurement | Optional extensometer or large-deformation transducer (ASTM E83 Class B-1 compliant) |
| Strain Accuracy | ±0.005% of reading |
| Safety Systems | Dual electronic limit switches, emergency stop button, overload protection (110% FS), automatic return-to-start function |
| Crosshead Control | Dual-speed (fast/slow) motorized adjustment with jog mode |
| Power Supply | 220 V AC, 1.0 kW |
| Dimensions (W×D×H) | 780 × 680 × 1780 mm |
| Net Weight | ~300 kg |
Overview
The Tuofeng TFW-257 Microcomputer-Controlled Electronic Universal Testing Machine is an electromechanical force-testing platform engineered for high-fidelity mechanical property characterization of polymeric pipes, thermoplastics, elastomers, composites, metals, and advanced engineering materials. Based on the fundamental principles of uniaxial tensile mechanics—governed by Hooke’s law, stress–strain continuum theory, and ASTM D638/D2105/D1598 standards—the system delivers traceable, repeatable, and metrologically validated measurements across static and quasi-static loading regimes. Its rigid C-frame architecture, preloaded ball-screw actuation, and closed-loop servo control ensure minimal compliance and exceptional axial alignment—critical for accurate determination of yield behavior, ductility, and failure modes in thin-walled plastic tubing under standardized extension protocols.
Key Features
- 0.5-class accuracy per ISO 7500-1 and GB/T 16491-2008, verified through third-party calibration certificates and traceable to national metrological standards
- Single-range, high-resolution load cell (1:500,000 internal resolution) eliminating range-switching artifacts and ensuring consistent sensitivity from 0.2% to 100% of full scale (25 kN nominal)
- Real-time closed-loop control of displacement, load, or strain using PID-regulated servo drive—enabling precise execution of ISO 527-2, ASTM D2838, and EN ISO 1133-2 test profiles
- Dual-speed crosshead positioning with jog functionality and programmable return-to-origin logic for efficient sample setup and post-test recovery
- Integrated safety architecture: dual-channel electronic end-stop limits, hardware-based emergency stop circuitry, and software-enforced overload cutoff at 110% of rated capacity
- Modular extensometry support—including clip-on axial extensometers (ASTM E83 Class B-1) and non-contact video extensometers—for direct strain measurement independent of machine compliance
Sample Compatibility & Compliance
The TFW-257 accommodates standard and custom-configured grips for plastic pipe specimens per ISO 1167-1 (pressure piping), ASTM D1598 (environmental stress cracking), and GB/T 8804.3 (polyethylene pipes). Its 400 mm effective test width and 800 mm vertical travel accommodate diameters up to Ø160 mm and lengths exceeding 1,000 mm when used with extended fixtures. The system fully supports international regulatory frameworks: test data integrity complies with FDA 21 CFR Part 11 requirements via optional audit-trail-enabled software; raw measurement logs meet GLP/GMP documentation criteria; and calibration records adhere to ISO/IEC 17025 traceability chains. All mechanical and electrical components conform to CE directives (2014/30/EU EMC, 2006/42/EC Machinery Directive) and RoHS 2011/65/EU material restrictions.
Software & Data Management
Tuofeng’s proprietary Windows-based testing software (v5.2) provides multi-mode control—including force-controlled ramp, displacement-controlled hold, strain-rate-defined creep, and cyclic loading sequences. It supports dynamic switching between SI, imperial, and metric units; real-time overlay of up to six concurrent curves (e.g., stress–strain, load–time, extension–time); and automated calculation of ASTM/ISO-compliant parameters: tensile strength (MPa), elongation at break (%), Young’s modulus (GPa), yield offset (0.2%), Poisson’s ratio, and secant modulus. All test files are stored in encrypted binary format with embedded metadata (operator ID, timestamp, environmental conditions, calibration ID). Export options include CSV, XML, PDF reports, and direct integration with LIMS via ODBC drivers. Software updates are delivered remotely with version-controlled release notes and validation documentation for regulated environments.
Applications
- Mechanical qualification of PVC, HDPE, PP-R, and PEX pipe extrusions per ISO 1167 series and GB/T 10002.1
- Long-term hydrostatic strength (LTHS) precursor testing and regression analysis per ISO 9080
- Environmental stress crack resistance (ESCR) evaluation using notched specimens per ASTM D1693
- Creep rupture behavior assessment under constant load conditions (ISO 9080 Annex A)
- Quality assurance in pipe manufacturing: batch verification against ASTM D2290 (ring tensile) and ISO 13953 (ring crush)
- Research-grade polymer structure–property correlation studies involving molecular weight distribution, filler dispersion, and crosslink density effects
FAQ
What standards does the TFW-257 support out-of-the-box?
The system includes preloaded test methods for ASTM D638, D2105, D1598, ISO 527-2, ISO 1167-1, GB/T 1040.2, and GB/T 8804.3. Custom method templates can be configured via the software’s scripting interface.
Can the machine perform creep or relaxation tests?
Yes—using the “Constant Load Hold” and “Constant Strain Hold” control modes, the system executes ISO 899-1 creep and ISO 899-2 relaxation protocols with time-stamped data logging at user-defined intervals down to 10 ms resolution.
Is third-party calibration certification included?
Each unit ships with a factory calibration certificate traceable to CNAS-accredited laboratories. Optional UKAS or DAkkS-certified calibration services are available upon request.
How is data integrity ensured for regulated industries?
The optional 21 CFR Part 11 module enables electronic signatures, role-based access control, immutable audit trails, and automatic backup to network drives—all validated per GAMP 5 guidelines.
What extensometer options are compatible?
Standard support for ASTM E83 Class B-1 axial extensometers (10–50 mm gauge length); optional digital video extensometry (VEM) with sub-pixel edge detection for non-contact strain mapping on opaque or textured surfaces.
