SUNS WAW-1 Electro-Hydraulic Servo Universal Testing Machine with W-Type Grips

Overview

The SUNS WAW-1 Electro-Hydraulic Servo Universal Testing Machine with W-Type Grips is an industrial-grade dual-zone mechanical testing system engineered for high-fidelity static mechanical characterization of structural and engineering materials. Based on closed-loop electro-hydraulic servo control architecture, the machine delivers precise force and displacement regulation across both tensile and compressive loading modes. Its dual-space configuration—comprising an upper tensile zone between the moving crosshead and fixed upper beam, and a lower compression zone between the lower crosshead and base platen—enables rapid, tool-free transition between test modes without realignment or recalibration. The W-type grip design features a semi-enclosed jaw geometry optimized for axial load alignment and lateral restraint, minimizing bending moments during high-force tensile tests on metallic rods, threaded fasteners, and flat sheet specimens. This architecture ensures compliance with fundamental principles of uniaxial stress state generation as defined in ISO 7500-1 (Class 0.5) and ASTM E4.

Key Features

• Dual-space mechanical frame: Independent tensile and compression zones allow concurrent setup of grips and platens, reducing changeover time by up to 40% versus single-zone systems.
• W-type semi-enclosed grips: Precision-machined hardened steel jaws with self-aligning wedge geometry provide uniform clamping pressure distribution and reduce specimen slippage at loads exceeding 90% of ultimate tensile strength.
• Worm-gear driven lower crosshead: Non-rotating lead screw mechanism ensures smooth, backlash-free vertical positioning with positional repeatability better than ±0.02 mm over full travel range.
• High-stiffness load train: Radial-load-capable load cell mounted directly to the piston rod via rigid flange coupling eliminates parasitic bending moments, enhancing force measurement fidelity per ISO 376 Annex B recommendations.
• Integrated hydraulic power unit: Oil-cooled, variable-displacement pump with pressure-compensated flow control enables stable low-speed testing down to 0.001 mm/min and high-speed return strokes up to 200 mm/min.

Sample Compatibility & Compliance

The WAW-1 accommodates standardized test specimens conforming to GB/T 228.1–2010 (tensile testing of metallic materials), ASTM E9 (compression testing of metallic materials), ASTM C39 (concrete cylinder compression), ASTM C78 (flexural strength of concrete), and ISO 6892-1 for monotonic tension. It supports round bars (diameter ≤ 40 mm), flat strips (thickness ≤ 25 mm, width ≤ 80 mm), threaded fasteners (M6–M30), cement mortar prisms (40 × 40 × 160 mm), and cylindrical concrete specimens (Ø150 × 300 mm). All mechanical components comply with ISO 12100 (safety of machinery) and meet CE Machinery Directive 2006/42/EC requirements when equipped with optional safety enclosures and light curtains. Load accuracy certification follows ISO 7500-1 Class 0.5 verification procedures, traceable to national metrology institutes.

Software & Data Management

The system operates with SUNS TestMaster v4.2 software—a Windows-based platform supporting multi-channel synchronized acquisition (load, displacement, extensometer, temperature if equipped) at up to 1 kHz sampling rate. Data export formats include CSV, XML, and PDF reports compliant with GLP documentation standards. Audit trail functionality records all user actions—including method edits, calibration events, and test result modifications—with timestamps and operator IDs. Electronic signatures and role-based access control align with FDA 21 CFR Part 11 requirements for regulated environments. Optional integration with LIMS via OPC UA or RESTful API enables automated data routing to enterprise quality management systems.

Applications

• Mechanical property validation of carbon steels, stainless alloys, aluminum extrusions, and titanium forgings per ASTM E8/E8M.
• Quality assurance testing of structural bolts, anchor rods, and shear connectors in civil infrastructure projects.
• Compressive strength assessment of Portland cement mortars and ready-mix concrete under controlled curing conditions.
• Flexural performance evaluation of fiber-reinforced concrete beams per ASTM C293/C78.
• R&D-level investigation of strain-rate sensitivity in high-strength low-alloy (HSLA) steels using programmed ramp-and-hold protocols.

FAQ

What is the maximum stroke length available for the WAW-1 model?

The standard vertical test space offers 1,200 mm between upper and lower platens, adjustable to accommodate specimens up to 1,000 mm in gauge length.
Can the WAW-1 be upgraded to support high-temperature testing?

Yes—optional furnace modules (up to 1,200 °C) and high-temperature extensometers are available with custom load frame reinforcement and thermal shielding.
Is third-party calibration certification included with delivery?

Each unit ships with factory calibration certificates traceable to CNAS-accredited laboratories; on-site ISO/IEC 17025 calibration services are available upon request.
Does the system support closed-loop strain control using extensometers?

Yes—the controller accepts analog inputs from clip-on, video, or laser extensometers and executes displacement- or strain-controlled tests per ISO 6892-1 Annex A.
What maintenance intervals are recommended for the hydraulic system?

Hydraulic oil and filter replacement is required every 2,000 operating hours or biannually, whichever occurs first; annual verification of servo valve linearity and hysteresis is advised.