JB/GWA-600B JiuBin Electro-Hydraulic Servo Testing Machine for Prestressed Steel Strands
| Brand | JiuBin |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Regional Classification | Domestic (PRC) |
| Model | JB/GWA-600B |
| Instrument Type | Electro-Hydraulic Servo Universal Testing Machine |
| Load Capacity | 600 kN |
| Force Measurement Range | 24–600 kN |
| Force Accuracy | ≤ ±1% of reading |
| Force Resolution | 0.01 kN |
| Displacement Resolution | 0.01 mm |
| Deformation Measurement Accuracy | 0.01 mm |
| Tensile Test Space | 1000 mm |
| Compression Space | 600 mm |
| Piston Stroke | 150 mm |
| Clamp Jaw Diameter (Standard) | Φ15.20 mm |
| Piston Speed | 0–50 mm/min |
| Clamping Method | Automatic Hydraulic Clamping |
| Host Dimensions (W×D×H) | 720 × 580 × 2350 mm |
| Control Cabinet Dimensions (W×D×H) | 1000 × 700 × 1400 mm |
Overview
The JB/GWA-600B is a high-capacity electro-hydraulic servo universal testing machine engineered specifically for the mechanical characterization of prestressed steel strands used in post-tensioned concrete structures, bridge cables, and precast infrastructure systems. It operates on the principle of closed-loop hydraulic force and displacement control, utilizing a digitally controlled servo valve and high-fidelity load cell feedback to maintain precise loading profiles across static and quasi-static test regimes. Designed in accordance with ISO 7500-1 (Class 1 accuracy), ASTM E4, and GB/T 228.1–2021 (Metallic Materials — Tensile Testing), the system delivers traceable, repeatable, and auditable results essential for quality assurance in structural materials manufacturing and third-party certification laboratories.
Key Features
- 600 kN maximum static load capacity with extended tensile travel (1000 mm) to accommodate full-length strand specimens up to 1 m, minimizing boundary effects during yield and necking evaluation.
- Dual-range high-stability load cell (24–600 kN) calibrated to ISO 376 Class 1 standards, ensuring linearity and hysteresis compliance under cyclic and monotonic loading.
- Automatic hydraulic clamping system with dedicated long-jaw fixtures (Φ15.20 mm standard) engineered to center-load multi-wire strands and promote mid-span fracture—critical for valid ultimate tensile strength (Rm) and uniform elongation (Agt) determination per ISO 15630-2.
- Integrated high-resolution extensometry: YYU-15/200 clip-on extensometer (gauge length 200 mm, resolution 0.01 mm) enables accurate measurement of non-proportional elongation (Ap0.2, Ap0.5) and elastic modulus (E) without reliance on crosshead displacement.
- Real-time synchronized data acquisition at ≥1 kHz sampling rate supports dynamic event capture, including load drop during wire breakage and strain localization onset.
- Modular servo oil source with pressure-compensated digital valve ensures stable flow control across full speed range (0–50 mm/min), enabling compliance with strain-rate-sensitive protocols such as ISO 6892-1 Annex B (strain-controlled tests).
Sample Compatibility & Compliance
The JB/GWA-600B accommodates standard 7-wire prestressed steel strands (e.g., ASTM A416 Grade 270, GB/T 5224–2014 Φ15.20 mm), as well as custom-diameter variants via interchangeable jaw sets. Compression testing is supported using a Φ160 mm platens compliant with ISO 376 Annex C for bearing stress evaluation. All hardware and firmware conform to electromagnetic compatibility (EMC) requirements per IEC 61326-1 and functional safety guidelines aligned with ISO 13857. The system architecture supports audit-ready operation under GLP and ISO/IEC 17025 environments, including user-level access control, electronic signature logging, and tamper-evident data export.
Software & Data Management
The embedded Windows-based testing software provides ISO 17025-compliant data integrity features: automatic timestamping, metadata tagging (operator ID, environmental conditions, calibration certificate IDs), and immutable raw-data archives in binary .tdms format. Users may define multi-step test procedures—including preload hold, ramp-to-load, relaxation phases—and export results directly to Excel (.xlsx) with customizable templates. The software includes built-in calculation modules for Rm, Rp0.2, E-modulus (via secant method), total elongation (At), and reduction of area (Z), all computed per ISO 6892-1 clauses. Audit trails record every parameter change, file save, and report generation event—fully compatible with FDA 21 CFR Part 11 requirements when deployed with domain-authenticated login and digital certificate integration.
Applications
- Tensile verification of low-relaxation 7-wire strands for bridge stay cables and segmental box girders.
- Quality conformance testing per ASTM A416, EN 10138-3, and GB/T 5224–2014 mechanical property thresholds.
- Evaluation of stress relaxation behavior under sustained load (when paired with optional long-term load-hold module).
- Compression testing of grouted duct assemblies and anchorage components per PTI M55.1.
- Research-grade modulus and Poisson’s ratio determination using dual-axis strain mapping (with optional DIC add-on).
- Calibration validation and inter-laboratory round-robin participation in CNAS-accredited facilities.
FAQ
What standards does the JB/GWA-600B support for steel strand testing?
It fully complies with ISO 6892-1, ISO 15630-2, ASTM A416, GB/T 228.1, and GB/T 5224–2014 for tensile property determination.
Can the system perform strain-controlled tests?
Yes—the servo controller supports closed-loop strain control using the YYU-15/200 extensometer, meeting ISO 6892-1 Annex B requirements.
Is the software validated for regulated environments?
The software architecture supports 21 CFR Part 11 compliance when configured with Windows Active Directory authentication, electronic signatures, and audit trail archiving.
What maintenance intervals are recommended for the hydraulic system?
Oil filtration and servo valve inspection are recommended every 1,500 operating hours; annual recalibration of load cell and extensometer is required per ISO/IEC 17025.
Are custom jaw configurations available for non-standard strand diameters?
Yes—JiuBin offers machined jaw inserts for Φ12.7 mm, Φ15.24 mm, and Φ17.8 mm strands, all designed to maintain uniform stress distribution and prevent slippage.
