SUNS WAW-G Electro-Hydraulic Servo Steel Strand Testing Machine (Dual-Space Configuration)
| Brand | SUNS |
|---|---|
| Origin | Shenzhen, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | WAW-G |
| Pricing | Available Upon Request |
Overview
The SUNS WAW-G Electro-Hydraulic Servo Steel Strand Testing Machine is a dual-space, high-capacity universal testing system engineered for precise static mechanical characterization of prestressed steel strands, structural metals, and high-strength fasteners. Based on the principle of electro-hydraulic servo control, it delivers stable, high-fidelity force application through a precision hydraulic actuation system coupled with real-time digital feedback loops. Designed specifically to meet the stringent geometric and kinematic requirements of steel strand tensile testing—including full-length elongation measurement, proportional limit detection, and ultimate tensile strength evaluation—the WAW-G complies with the axial loading geometry, grip alignment tolerances, and extensometer positioning stipulated in GB/T 5224–2003. Its dual-space architecture allows independent operation of upper and lower crossheads, enabling simultaneous or sequential execution of tension and compression tests without reconfiguration—critical for laboratories performing multi-standard validation across ASTM E8/E21, ISO 6892-1, DIN EN 10002-1, and JIS Z 2241.
Key Features
- Full-digital closed-loop control system supporting concurrent and switchable force, displacement, and strain regulation with sub-millisecond response time and <±0.5% load accuracy over 1–100% of full scale.
- Dual-space frame design with rigid C-frame construction; column material: medium-carbon steel (AISI 1045 equivalent), surface-hardened and chromium-plated for long-term dimensional stability and corrosion resistance.
- Main hydraulic cylinder incorporates dual-seal architecture—clearance seal for dynamic pressure containment and STRENGTH® polyurethane piston seal (equivalent to Parker’s “Sta-Seal”)—ensuring zero hydraulic leakage over ≥10,000 operational cycles under rated load.
- Non-contacting pull-out type optical encoder for crosshead displacement measurement, offering ±0.01 mm resolution and repeatability better than ±0.02 mm per 100 mm travel.
- G-type wedge-action grips with self-aligning jaw faces and adjustable clamping pressure, optimized for 9.0–18.0 mm diameter steel strands and threaded rods up to M36.
- Integrated overload protection, emergency stop circuitry compliant with IEC 60204-1, and hydraulic pressure relief valves calibrated to ±2% of setpoint.
Sample Compatibility & Compliance
The WAW-G accommodates specimens ranging from 9.0 mm to 18.0 mm nominal diameter steel strands (including 1×7, 1×19, and 7×7 configurations), solid round bars (up to Ø40 mm), flat plates (max. 40 mm thickness × 100 mm width), and high-tensile bolts/nuts per ISO 898-1 and ASTM F568M. All test procedures adhere to traceable calibration protocols aligned with ISO/IEC 17025:2017. Force transducers are verified annually per ASTM E4 and accredited against NIST-traceable deadweight standards. The system supports GLP-compliant audit trails when paired with optional 21 CFR Part 11–enabled software modules, including electronic signatures, user access tiers, and immutable data logging.
Software & Data Management
Control and analysis are executed via SUNS TestMaster™ v5.2—a Windows-based platform supporting real-time curve overlay, automatic yield point detection (0.2% offset method), modulus calculation (tangent/secant), and fracture energy integration. Raw data export is available in CSV, XML, and ASTM E1435-compliant .tdms formats. The software includes built-in report templates conforming to GB/T 228.1–2021, ASTM E8M, and ISO 6892-1 Annex A. Optional networked deployment enables centralized fleet monitoring, remote diagnostics, and synchronized firmware updates across laboratory networks.
Applications
- Tensile testing of pre-stressing steel strands for bridge cables, post-tensioned concrete structures, and wind turbine foundations.
- Mechanical verification of reinforcing bars (rebar) per ASTM A615/A706 and GB/T 1499.2.
- Proof loading and ultimate strength assessment of anchorages, couplers, and shear connectors in civil infrastructure projects.
- Quality assurance testing of high-strength fasteners used in aerospace ground support equipment and rail vehicle chassis assemblies.
- R&D validation of new alloy formulations (e.g., Cr-Mo steels, low-alloy quenched & tempered grades) under controlled strain rates (0.00025–0.0025 s⁻¹).
FAQ
Does the WAW-G support automatic yield strength determination per ISO 6892-1 Method A?
Yes—TestMaster™ implements both graphical (0.2% offset) and automatic derivative-based yield point identification with user-adjustable smoothing and noise filtering thresholds.
Can the system be integrated into an existing LIMS environment?
Yes—via OPC UA server interface (optional add-on), supporting bidirectional data exchange with LabVantage, Thermo Fisher SampleManager, and Siemens Opcenter Quality.
Is third-party calibration certification included with delivery?
Each unit ships with a factory-issued calibration certificate traceable to CNAS-accredited reference standards; on-site ISO/IEC 17025 calibration by authorized service partners is available upon request.
What is the maximum recommended stroke for extensometer-equipped tests?
For high-accuracy strain measurement using clip-on or video extensometers, the recommended maximum crosshead travel is 300 mm to maintain optical field-of-view integrity and minimize parallax error.
Are G-type grips compatible with non-circular specimens such as flat strips or welded joints?
G-type jaws can be retrofitted with custom-faced inserts (e.g., serrated tungsten carbide or soft aluminum pads); however, flat-strip testing requires dedicated planar-grip kits—available as accessory SKUs.
