Falex 081-001-005 Oscillating Wear Tester

Overview

The Falex 081-001-005 Oscillating Wear Tester is a precision-engineered tribological testing instrument designed specifically for evaluating the anti-fretting wear performance of greases and lubricating formulations under controlled oscillatory conditions. It operates on the ball-on-cylinder configuration in accordance with ASTM D4170—Standard Test Method for Fretting Wear Resistance of Lubricating Grease—and is widely adopted by lubricant developers, OEMs, and independent testing laboratories to assess grease film integrity, load-carrying capacity, and surface protection efficacy in rolling-element bearing applications. The test principle relies on reciprocating oscillation of a hardened steel cylinder against a stationary high-carbon steel ball under sustained axial load, simulating real-world micro-motion conditions that occur at bearing raceways, shaft-hub interfaces, and other constrained mechanical joints. Unlike continuous rotation testers, this system replicates fretting—a low-amplitude oscillatory motion (<100 µm) induced by vibration or cyclic loading—that leads to oxidative degradation, wear debris generation, and eventual fatigue failure if inadequately mitigated by the lubricant.

Key Features

• Engineered compliance with ASTM D4170 and SH/T 0716 protocols, ensuring regulatory acceptability for product qualification and technical documentation.
• Robust load application system delivering a precise, stable 2450 N (550 lbf) axial force via calibrated hydraulic or mechanical actuation—maintained within ±1% over full test duration.
• High-stability oscillation drive operating at 30.0 Hz (1800 cycles per minute), with phase-controlled waveform output to minimize harmonic distortion and ensure repeatable displacement amplitude.
• Optional Load Uniformity Adjustment System enables dynamic redistribution of contact pressure during extended tests, compensating for localized deformation or thermal drift to preserve consistent Hertzian stress distribution.
• Modular sample holder design accommodates standard 19 mm diameter balls and 38 mm long cylindrical specimens (25.4 mm OD), with interchangeable fixtures for alternate geometries per custom method development.
• Integrated temperature monitoring port supports optional external oil bath or Peltier-based thermal control (not included), enabling evaluation across operational temperature ranges from −20 °C to +100 °C.

Sample Compatibility & Compliance

The tester accepts commercially available bearing-grade steel specimens (AISI 52100 or equivalent) conforming to ASTM E18 hardness requirements. Grease samples are loaded directly into the test cavity without dilution or carrier fluid—preserving native rheology and thickener architecture. All test reports generated using this system satisfy traceability requirements for ISO/IEC 17025-accredited laboratories. Data outputs—including wear scar diameter (WSD), mass loss, friction coefficient trend, and post-test surface topography annotations—are structured to support GLP-compliant audit trails and FDA 21 CFR Part 11–aligned electronic record retention when paired with validated software modules.

Software & Data Management

While the base unit operates via analog control panel with manual data logging, it is fully compatible with Falex’s optional Digital Data Acquisition Module (DDAM-OS), which provides synchronized acquisition of load, displacement, friction force, and cycle count at ≥1 kHz sampling rate. Export formats include CSV, Excel-compatible .xls, and XML for integration into LIMS environments. Firmware supports configurable pass/fail thresholds aligned with ASTM D4170 acceptance criteria (e.g., WSD ≤ 0.80 mm after 22 h), automatic report generation with digital signature fields, and timestamped metadata embedding for chain-of-custody verification.

Applications

• Formulation screening of lithium-, polyurea-, and calcium-sulfonate complex greases for rail, wind turbine, and heavy-duty truck applications.
• Comparative assessment of additive packages—especially anti-wear (AW), extreme pressure (EP), and oxidation inhibitors—in grease matrices.
• Root-cause analysis of premature bearing failures attributed to micro-motion-induced wear in static or low-speed rotating assemblies.
• Supporting OEM specification development (e.g., SKF LGMT 2, Timken GPO, GM 6277M) requiring fretting resistance validation.
• Academic and industrial research on tribofilm formation kinetics, shear-induced thickener breakdown, and boundary lubrication mechanisms under oscillatory shear.

FAQ

What is the primary purpose of the Falex 081-001-005 Oscillating Wear Tester?

It quantifies the ability of lubricating greases to prevent fretting wear between oscillating metal surfaces, as defined in ASTM D4170.
Does the instrument include temperature control capability?

No—thermal regulation requires an externally coupled oil bath or Peltier stage; the base system maintains ambient operation only.
Can test parameters be modified beyond ASTM D4170 defaults?

Yes—load, frequency, stroke length, and duration are user-adjustable within mechanical and safety limits for method development and comparative studies.
Is calibration certification provided with the system?

Each unit ships with NIST-traceable load cell and displacement transducer calibration certificates, valid for 12 months from date of shipment.
How is wear quantified after testing?

Wear scar diameter (WSD) is measured optically using a calibrated stereo microscope per ASTM D2266 or ISO 19253, while gravimetric mass loss may be determined separately using analytical balance (±0.01 mg resolution).