Gear Failure Analysis
Identify root causes of gear failure with advanced gear failure analysis services. Using metallurgical testing, microscopy, and surface evaluation, we detect wear, fatigue, misalignment, and material defects to improve reliability, prevent downtime, and enhance gear performance.
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Precision-driven testing for dimensional accuracy and compliance
- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Gear Failure Analysis - Overview
Gear failure analysis identifies the root causes of premature gear failure through systematic examination of fracture surfaces, wear patterns, metallurgical condition, lubrication traces, and manufacturing quality. Gears fail through distinct mechanisms — fatigue, pitting, spalling, scuffing, bending fracture, and plastic deformation — each leaving characteristic evidence on tooth surfaces and fracture faces.
This service supports gearbox OEMs, repair facilities, and end users in identifying failure causes, attributing responsibility, improving design and manufacturing practices, and preventing recurrence in service.
Scope, Applications, and Benefits
Scope
Gear failure analysis focuses on identifying the root causes of damage and performance degradation in gear systems. It combines fracture evaluation, wear assessment, and metallurgical examination to determine failure mechanisms and prevent recurrence.
Key aspects include:
- Fracture analysis: Identification of failure mode and origin
- Contact fatigue: Evaluation of pitting, micro pitting, and spalling
- Wear mechanisms: Assessment of abrasive and adhesive wear, such as scoring and scuffing
- Bending fatigue: Analysis of crack initiation and propagation under cyclic loading
- Metallurgical integrity: Examination of case depth, core hardness, and microstructure
Applications
- Industrial gearbox and drive system failure investigations
- Wind turbine gearbox failure analysis
- Automotive transmission and differential gear failures
- Aerospace propulsion gearbox failure investigation
- Marine and off-highway equipment drivetrain analysis
Benefits
- Identifies specific failure mechanism and origin
- Attributes failure to design, manufacturing, lubrication, or operation
- Supports insurance claims and warranty disputes
- Provides actionable recommendations for failure prevention
- Generates evidence-based failure reports for legal or technical purposes
Gear Failure Analysis - Test Process
Visual Examination
Inspect and document failure mode, origin, and surface condition.
1SEM Fractography
Analyze fracture features like fatigue, pitting, and cracks.
2Metallurgical Analysis
Examine cross-sections for microstructure and case depth.
3Hardness & Composition
Verify hardness profile and material composition.
4Gear Failure Analysis - Technical Specifications
| Parameter | Details |
|---|---|
| Failure Modes | Pitting, spalling, scuffing, bending fatigue, overload fracture, wear |
| Metallurgical Tests | Microhardness, SEM-EDS, optical metallography, OES |
| Case Depth Measurement | Effective case depth per AGMA 2001 |
| Documentation | Full photographic, SEM, and metallographic records |
Instrumentation Used for Testing
- Stereo microscope and macro photography setup
- Scanning electron microscope (SEM) with EDS
- Optical metallographic microscope
- Vickers hardness tester (microhardness traverse)
- Optical emission spectrometer (OES) for alloy verification
- Surface profilometer for roughness and wear quantification
Results and Deliverables
- Macro and SEM photographic documentation of failure features
- Failure mode and mechanism classification
- Metallurgical condition assessment (microstructure, hardness profile, case depth)
- Material compliance verification
- Root cause determination and contributing factors
- Recommendations for corrective action and failure prevention
- Full gear failure analysis report
Frequently Asked Questions
Contact fatigue (pitting and spalling) is the most common failure mode in well-lubricated gear systems, developing from sub-surface cracks at Hertzian stress concentrations. Bending fatigue fracture at the tooth root is the second most common, typically triggered by stress concentrations, surface defects, or overloading.
Fatigue fractures show characteristic beach marks, crack arrest lines, and a smooth, progressive fracture zone with a small final fracture zone, indicating long-term crack growth. Overload fractures show a rough, fibrous or cleavage fracture surface with no progressive crack front evidence, indicating sudden failure from a single load cycle.
Inadequate lubrication is a primary cause of adhesive wear (scuffing), pitting acceleration, and thermal damage. Lubricant analysis — viscosity, additive depletion, contamination — is often conducted alongside gear failure analysis to determine whether lubrication contributed to the failure.
Provide: gear drawing or specification, material specification, heat treatment records, lubrication type and condition, operating load and speed history, installation and maintenance records, and a description of the failure event (sudden vs. gradual, unusual noise or vibration before failure).
Yes. Metallurgical examination can identify manufacturing anomalies such as insufficient case depth, grinding burns (rehardened/over-tempered surface layers), forging defects, improper microstructure, and out-of-specification composition that may have contributed to premature failure.
Why Choose Infinita Lab for Advanced Materials Testing and Characterization?
At the core of this breadth is our network of 2,000+ accredited laboratories across the USA, offering access to over 10,000 testing methods and analytical services. From advanced materials characterization (SEM, TEM, RBS, XPS) to mechanical, chemical, environmental, biological, and standardized ASTM/ISO-compliant testing, we deliver unmatched flexibility, specialization, and scale. You are never limited by geography, facility, or methodology — Infinita Lab connects you to the right expertise and testing solution, every time.
Looking for a Trusted Partner for Accurate and Reliable Testing Services?
Send query us at hello@infinitlab.com or call us at (888) 878-3090 to learn more about our services and how we can support you.
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