SUNS YAW-YJ Series Electro-Hydraulic Servo Compression-Shear Testing Machine

Overview

The SUNS YAW-YJ Series Electro-Hydraulic Servo Compression-Shear Testing Machine is a high-capacity, dual-axis structural testing system engineered for the precise mechanical characterization of elastomeric bridge bearings and seismic isolation devices. Designed to operate under combined axial compression and lateral shear loading, the system implements servo-controlled hydraulic actuation with synchronized force and displacement feedback loops—enabling true biaxial load path simulation as required by structural bearing qualification protocols. Its architecture conforms to the fundamental principles of structural mechanics testing: controlled load application, real-time deformation monitoring (axial shortening, radial shear displacement, rotational angular deflection), and standardized data reduction per industry-specific formulas (e.g., compressive modulus, shear modulus, coefficient of friction, aging-induced stiffness degradation). The machine serves as a primary verification tool in pre-commissioning quality assurance for civil infrastructure components, particularly where long-term serviceability, fatigue resistance, and post-yield energy dissipation must be empirically validated.

Key Features

• Modular high-load frame design supporting rated capacities of 5000 kN, 10000 kN, 20000 kN, and 30000 kN—each configured with dual independent servo-hydraulic actuators for simultaneous vertical and horizontal loading.
• DSCC-5000 full-digital closed-loop control system enabling coordinated control of test force, displacement, and strain across both axes—with programmable ramp rates, hold periods, cyclic profiles, and multi-step loading sequences.
• Integrated high-precision transducers: S-type load cells (ISO 376 Class 0.5) for axial and shear force measurement; LVDTs and potentiometric displacement sensors (resolution ≤ 1 µm) for axial compression, lateral shear, and rotational angle detection.
• Self-aligning bearing fixture assembly with spherical seating and low-friction sliding interfaces to minimize parasitic moments and ensure uniform stress distribution during compression-shear coupling tests.
• Robust structural steel frame with reinforced crosshead guidance and preloaded column tie rods—engineered for minimal deflection (< 0.02% of stroke) under maximum rated load.
• Real-time synchronization of analog and digital I/O channels ensures sub-millisecond timestamp alignment between force, displacement, and environmental sensor inputs (e.g., temperature, humidity).

Sample Compatibility & Compliance

The YAW-YJ accommodates standard and custom-sized elastomeric bearings—including laminated rubber pads, pot-type bearings, spherical bearings, and lead-rubber isolators—within defined dimensional envelopes (up to 2000 mm × 2000 mm plan area and 800 mm height). Specimen mounting fixtures are configurable for centering, eccentric loading, and constrained boundary conditions per test standard requirements. The system is fully compliant with internationally referenced transportation infrastructure standards: JT/T 4–2004 (Highway Bridge Laminated Rubber Bearings), JT/T 391–2009 (Highway Basin-Type Bearings), GB/T 17955–2009 (Spherical Bearings), GB 20688.4–2007 (Elastomeric Bearings – Part 4: Seismic Isolators), TB/T 1893–2006 (Railway Laminated Bearings), and TB/T 2331–2004 (Railway Basin-Type Bearings). All test routines support traceable calibration per ISO/IEC 17025 and maintain audit-ready records aligned with GLP principles.

Software & Data Management

Control and acquisition are managed via SUNS TestStudio™ v5.x—a Windows-based platform supporting ASTM E1823-compliant test method templates, automated calculation of derived parameters (e.g., compressive elastic modulus, shear modulus, rotation capacity, creep ratio), and export of raw time-series data in ASCII and HDF5 formats. The software includes built-in validation checks for data continuity, transducer zero drift compensation, and dynamic range optimization. Audit trails record all user actions, parameter changes, and calibration events with timestamps and operator IDs—ensuring compliance with FDA 21 CFR Part 11 requirements when deployed in regulated QA/QC environments. Data archives are structured for seamless integration with LIMS platforms and third-party statistical analysis tools (e.g., Minitab, MATLAB).

Applications

• Compression-shear coupling tests on bridge elastomeric bearings per JT/T 4–2004, including axial stiffness, shear stiffness, and friction coefficient evaluation under varying normal loads.
• Rotation capacity and moment-rotation hysteresis characterization of spherical and pot-type bearings under combined axial load and angular displacement.
• Accelerated aging assessment: pre- and post-thermal/ozone exposure comparison of load-deflection behavior to quantify degradation of viscoelastic performance.
• Creep and relaxation testing at sustained loads up to 80% of ultimate capacity, with time-dependent deformation tracking over durations exceeding 1000 hours.
• Seismic performance validation of high-damping rubber bearings and lead-core isolators under displacement-controlled cyclic loading protocols (e.g., sine sweep, random vibration spectra).
• Calibration and verification of structural health monitoring (SHM) sensor outputs using reference-grade mechanical boundary conditions.

FAQ

What load capacities are available for the YAW-YJ series?

The system is offered in four standard configurations: 5000 kN, 10000 kN, 20000 kN, and 30000 kN—each optimized for frame rigidity, actuator response bandwidth, and transducer linearity within its designated range.
Does the system support automated test sequence execution per JT/T 4–2004?

Yes. Predefined test templates in TestStudio™ implement all required loading steps—including preload stabilization, incremental shear cycles, axial unloading/reloading, and final residual deformation measurement—as specified in Clause 6.3 of JT/T 4–2004.
How is traceability maintained for calibration and test data?

All force and displacement transducers are calibrated annually against NIST-traceable reference standards. Software-enforced electronic signatures, immutable audit logs, and PDF-certified test reports meet ISO/IEC 17025 documentation requirements.
Can the YAW-YJ perform combined compression-shear-rotation tests?

Yes. With optional rotary actuator integration and triaxial fixture kits, the system supports coupled axial-shear-rotational loading paths for advanced bearing qualification per GB/T 17955–2009 Annex C.
Is remote diagnostics and firmware update capability supported?

The DSCC-5000 controller features embedded Ethernet connectivity with secure SSH access, enabling remote configuration review, real-time signal monitoring, and version-controlled firmware updates without onsite technician intervention.