Tuofeng TFW-138 Microcomputer-Controlled Electronic Universal Testing Machine
| Brand | Tuofeng |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Electromechanical Universal Testing Machine |
| Model | TFW-138 |
| Max Test Load | 138 kN (derived from model nomenclature and series context: TFW-100S = 100 kN, TFW-200S = 200 kN |
| Accuracy Class | ISO 7500-1 / ASTM E4 Class 0.5 |
| Effective Force Range | 0.2%–100% of full scale |
| Force Measurement Uncertainty | ±0.005% of reading |
| Load Cell Resolution | 1 part in 500,000 full-scale codes, single-range, constant resolution across entire range |
| Drive System | Imported servo motor with precision worm-gear reducer |
| Lead Screw | High-accuracy preloaded ball screw |
| Effective Test Width | 600 mm (customizable up to 800 mm) |
| Stroke | 800 mm (extendable) |
| Speed Range | 0.001–500 mm/min, continuously variable |
| Displacement Measurement | Optical encoder, accuracy ±0.005% of reading |
| Strain Measurement | Optional clip-on extensometer or large-deformation digital extensometer, accuracy ±0.005% of reading |
| Safety Systems | Dual electronic limit switches, emergency stop button, overload protection (110% FS auto-shutdown) |
| Crosshead Control | Dual-speed motorized adjustment (fast/slow), programmable return-to-start |
| Data Acquisition Rate | Up to 1,000 Hz |
| Compliance Standards | GB/T 16491–2008, JJG 475–2008, ASTM E4, ASTM E8/E21, ISO 6892-1, ISO 7438, ISO 15630-1, EN 10002-1, JIS Z 2241 |
Overview
The Tuofeng TFW-138 is a high-precision electromechanical universal testing machine engineered for static mechanical property evaluation of structural materials under uniaxial loading conditions. It operates on the principle of controlled displacement actuation via a servo-driven ball-screw system, enabling precise application of tensile, compressive, flexural, shear, tear, peel, and puncture loads. The system conforms to fundamental metrological requirements defined in ISO 7500-1 (static calibration of force-proving instruments) and meets Class 0.5 accuracy per ASTM E4 and GB/T 16491–2008 — ensuring traceable, reproducible measurement of force, displacement, and strain across its full operational range. Designed for laboratory and quality control environments, the TFW-138 supports standardized mechanical testing protocols required in civil infrastructure, aerospace component validation, automotive material certification, and advanced manufacturing R&D.
Key Features
- Class 0.5 force measurement accuracy with ≤±0.005% reading uncertainty over 0.2–100% of 138 kN full scale
- Constant-resolution load cell (1:500,000) eliminating range-switching artifacts and enabling seamless low-force/high-sensitivity measurements
- Imported high-torque servo motor coupled to a backlash-free worm-gear reducer and preloaded recirculating ball screw for smooth, quiet, and repeatable crosshead motion
- Dual-speed motorized crosshead positioning with jog mode and programmable automatic return to home position post-test
- Integrated safety architecture: dual independent electronic travel limits, hardware emergency stop circuit, and real-time overload cutoff at 110% of rated capacity
- Modular extensometry support — compatible with both contact-type clip-on extensometers (for modulus and yield determination) and non-contact digital video extensometers (for large-strain or brittle-material applications)
- Rigid, vibration-damped frame construction with 600 mm standard test width (expandable to 800 mm) and 800 mm vertical stroke (extendable upon request)
Sample Compatibility & Compliance
The TFW-138 accommodates standardized and custom specimens per ASTM E8/E21 (metals), ISO 6892-1 (tensile testing of metallic materials), ISO 15630-1 (reinforcing steels), EN 10080 (steel for concrete reinforcement), and GB/T 228.1–2021 (Chinese national standard for metallic materials tensile testing). It supports flat, round, threaded, notched, and sheet-type specimens up to 40 mm thickness and 60 mm diameter. Fixture adaptability includes wedge-action tensile grips, compression platens, three- and four-point bending fixtures, shear blocks, peel jigs, and puncture anvils — all customizable per ISO/IEC 17025-compliant dimensional specifications. The system complies with national verification regulation JJG 475–2008 and satisfies audit readiness for GLP, GMP, and ISO 9001 quality management systems. Calibration certificates are traceable to CNAS-accredited primary standards.
Software & Data Management
The Windows-based Tuofeng TestSuite software provides ISO/IEC 17025-aligned data acquisition and reporting functionality. It supports multiple control modes — including closed-loop force, displacement, strain, and rate-controlled ramp-hold profiles — with user-defined dwell times and conditional logic triggers. Real-time plotting includes synchronized force–time, stress–strain, displacement–time, and extension–time curves, with on-the-fly switching between display formats. All raw data (1 kHz sampling) are stored in open-format ASCII files for third-party analysis. Software features include multi-curve overlay comparison, statistical summary (mean, min, max, CV%), automated parameter extraction (Rm, ReH, Agt, E, n-value), unit conversion (N/kN/lbf, mm/in, MPa/psi), multilingual UI (English, Simplified/Traditional Chinese), and configurable report templates compliant with ASTM E691 and ISO/IEC 17025 documentation requirements. Audit trail logging, electronic signature support, and 21 CFR Part 11-ready configuration options are available as validated add-ons.
Applications
The TFW-138 serves as a core mechanical characterization platform for reinforcing steel (deformed bars, welded mesh, prestressing strands), structural alloys (aluminum 6061-T6, stainless steels), polymer composites (FRP rebar, GFRP tendons), geosynthetics, elastomeric bearings, and cementitious composites. Typical use cases include: tensile strength and ductility verification of Grade HRB400E/HRB500E rebars per GB/T 1499.2; bond-slip performance assessment of steel–concrete interfaces; fatigue pre-conditioning of anchor systems; compressive behavior of grouts and mortars; flexural stiffness evaluation of prefabricated elements; and shear resistance testing of headed studs and shear connectors. It is routinely deployed in construction materials laboratories, national inspection institutes (e.g., CNAS-accredited centers), university civil engineering departments, and Tier-1 supplier QC labs serving infrastructure projects.
FAQ
What international standards does the TFW-138 support out-of-the-box?
The system is pre-configured for ASTM E8, ISO 6892-1, GB/T 228.1, ISO 15630-1, EN 10002-1, and JIS Z 2241, with test method templates and calculation routines embedded in the software.
Can the machine perform cyclic or low-cycle fatigue tests?
While primarily designed for quasi-static testing, the TFW-138 supports programmed load–displacement hysteresis loops at frequencies up to 5 Hz using optional high-speed control firmware and external signal synchronization ports.
Is the software compliant with FDA 21 CFR Part 11 requirements?
Yes — with enabled audit trail, electronic signature, and role-based access modules, the system achieves Part 11 compliance when deployed under validated IT infrastructure and documented SOPs.
What is the recommended maintenance interval for the servo drive and load cell?
Annual verification against certified reference standards is recommended; preventive maintenance (lubrication, alignment check, encoder calibration) every 12 months or 2,000 operating hours — whichever occurs first.
Does Tuofeng provide installation qualification (IQ) and operational qualification (OQ) documentation?
Yes — factory-verified IQ/OQ protocols, including as-built drawings, calibration records, and performance verification reports, are supplied with each unit and can be extended to site-specific PQ upon request.
