Keysight LFH/BFH/RFH/DFH/FFH Series Electromechanical and Electro-Hydraulic Fatigue Testing Systems

Overview

The Keysight LFH, BFH, RFH, DFH, and FFH series represent a modular family of precision fatigue and mechanical property testing systems engineered for high-fidelity dynamic and static mechanical characterization of metallic alloys, composites, polymers, biomedical implants, and structural components. These systems operate on fundamental principles of servo-controlled mechanical actuation—leveraging either electro-hydraulic (LFH, RFH) or high-bandwidth electromechanical (BFH, DFH, FFH) architectures—to impose controlled, repeatable cyclic loading profiles. Unlike generic tensile testers, Keysight’s fatigue platforms are designed around closed-loop digital control algorithms compliant with ISO 6892-1, ASTM E466, ASTM E606, and ISO 1099 for constant-amplitude and variable-amplitude fatigue testing. The core measurement fidelity derives from traceable load cell calibration (ISO 376 Class 0.5), high-resolution position encoders (≤0.1 µm resolution), and real-time data acquisition at ≥10 kHz sampling rates—enabling accurate hysteresis loop analysis, crack initiation monitoring via compliance methods, and S–N curve generation under fully documented test conditions.

Key Features

• Multi-waveform excitation engine supporting sinusoidal, triangular, trapezoidal, rectangular, and custom arbitrary waveforms—programmable via Keysight TestStudio software with phase-synchronized channel coupling.
• Modular actuator design: LFH series employs dual-cylinder electro-hydraulic servo systems for high-force, low-frequency durability testing (up to 250 kN, 50 Hz); BFH SERVO PAQ II is a compact, self-contained electromechanical actuator (max 25 kN, 100 Hz) with magnetic base or fixture-mount adaptability for on-site or component-level testing.
• RFH torsional fatigue systems integrate high-torque rotary actuators (±5,000 N·m peak) with optical angle encoders (0.001° resolution) and dynamic torque transducers calibrated per ISO 376 Annex C.
• DFH static torsion units provide steady-state torque application with ±0.25% full-scale accuracy and programmable ramp-hold sequences compliant with ISO 7886-1 (for medical device torsion validation).
• FFH rotating bending rigs conform to ASTM E2207 and ISO 1143 standards, delivering precise rotational speed control (0.1–10,000 rpm) and radial load application via air-bearing-supported spindles to minimize parasitic moments.
• All systems feature integrated safety interlocks, emergency stop circuits certified to IEC 61508 SIL2, and hardware-based overload protection with dual-stage force limiting.

Sample Compatibility & Compliance

The LFH/BFH/RFH/DFH/FFH platform supports standardized specimen geometries per ASTM E8/E9 (tension/compression), ASTM E143 (shear), ASTM E1437 (torsion), and ISO 12107 (fatigue crack growth). Custom fixturing—including threaded end grips, hydraulic wedge grips, torsion collets, and rotating bending mandrels—is available with material certifications (316L SS, Inconel 718) and surface finish documentation (Ra ≤ 0.4 µm). System-level compliance includes CE marking (2006/42/EC Machinery Directive), RoHS 2011/65/EU, and electromagnetic compatibility per EN 61326-1. For regulated environments, optional audit-trail-enabled firmware meets FDA 21 CFR Part 11 requirements for electronic records and signatures, with time-stamped, immutable test logs exportable in CSV, XML, and PDF/A-2 formats.

Software & Data Management

Keysight TestStudio v5.2 serves as the unified control, acquisition, and analysis environment across all models. It provides ISO/IEC 17025-aligned calibration management, automated test sequence scripting (Python API supported), real-time FFT spectral analysis, and hysteresis energy dissipation calculation. Raw data streams are stored in HDF5 format with embedded metadata (test standard, operator ID, environmental conditions, calibration certificates). Integrated reporting modules generate ASTM-compliant fatigue life reports—including Goodman, Gerber, and Morrow mean stress corrections—and support GLP/GMP workflows with role-based access control, electronic signatures, and revision-controlled test method templates. Data export interfaces include OPC UA, RESTful API, and direct SQL Server integration for LIMS or MES synchronization.

Applications

• Aerospace: Turbine blade vibration fatigue, landing gear component spectrum testing per MIL-STD-1540D.
• Automotive: Powertrain mount durability, CV joint torsional endurance, suspension arm rotating bending validation.
• Biomedical: ISO 14801-compliant fatigue testing of dental implant abutments and orthopedic fixation devices.
• Energy: Wind turbine composite spar cap coupon testing under multiaxial load spectra (IEC 61400-23).
• Electronics: PCB solder joint thermo-mechanical fatigue simulation using thermal-strain waveform synthesis.
• Academic research: High-cycle fatigue behavior of additively manufactured Ti-6Al-4V under variable amplitude loading (ASTM E1049).

FAQ

What distinguishes the LFH electro-hydraulic system from the BFH electromechanical actuator?
The LFH series delivers higher force capacity (up to 250 kN) and superior low-frequency stability for large-component durability testing, while the BFH SERVO PAQ II prioritizes portability, rapid setup, and high-frequency response (up to 100 Hz) for small-part or field-deployable applications.
Can RFH torsional fatigue tests be synchronized with axial loading for multiaxial fatigue studies?
Yes—when integrated with an LFH axial frame via Keysight’s Multi-Axis Coordination Module, RFH torsional actuators achieve phase-locked biaxial control with <±0.5° angular synchronization tolerance.
Is DFH static torsion testing compliant with ISO 7886-1 for syringe barrel evaluation?
Yes—the DFH system includes pre-validated test methods, torque transducer calibration certificates traceable to NMIJ, and report templates aligned with ISO 7886-1 Annex B requirements.
Does TestStudio support automated pass/fail evaluation against user-defined S–N thresholds?
Yes—custom pass/fail logic can be scripted using Python within TestStudio, with results logged alongside raw waveform data and flagged in summary reports.
Are calibration certificates supplied with each system shipment?
Each unit ships with a factory calibration certificate (ISO/IEC 17025-accredited lab), including load, displacement, torque, and angular position verification data, valid for 12 months under standard operating conditions.