Fatigue Testing Services
By delivering cyclic loading to a building or coupon, fatigue testing is a specialized type of mechanical testing. These tests can determine binding sites, produce data on fatigue life and fracture propagation, or show the safety of a structure subject to fatigue.
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Fatigue Testing Services
- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Fatigue Testing Services Overview
Fatigue is the leading cause of mechanical failure in structural components. A material can fail under cyclic loading at stress levels far below its static yield strength -not because it is weak, but because repeated loading initiates and propagates microscopic cracks that grow with each cycle until the remaining cross-section can no longer carry the load and fractures suddenly. Understanding a material’s or component’s fatigue behavior is not optional for anything that moves, flexes, vibrates, or experiences repeated loading in service.
Fatigue testing characterizes this behavior by applying controlled cyclic loads or strains to specimens or components and measuring the number of cycles they survive. Depending on what question needs to be answered, testing might focus on stress-life behavior (S-N curves for high-cycle fatigue), strain-life behavior (low-cycle fatigue under large plastic strains), fatigue crack growth rates, or the combined effect of fatigue and creep at elevated temperatures. The test configuration, loading mode, specimen geometry, and governing standard are selected based on the material, application, and required data type.
At Infinita Lab, we coordinate fatigue testing across the full spectrum of methods and material types through our network of accredited testing laboratories. Whether the requirement is routine S-N data for a metal alloy, strain-controlled low-cycle fatigue for a turbine material, fatigue crack growth rate measurement for a fracture mechanics assessment, or component-level fatigue testing under representative service loads, we connect clients to labs with the right capabilities and help scope the program correctly from the start.
Fatigue Testing Services Scope, Applications, and Benefits
Scope
Fatigue testing services at Infinita Lab cover the full range of fatigue test methods applicable to metallic, plastic, adhesive, ceramic, and composite materials. Test types include axial stress-controlled fatigue (force-controlled, load ratio specified), axial strain-controlled low-cycle fatigue (ASTM E606), rotating bending fatigue (ASTM E2948), flexural fatigue for plastics (ASTM D7774), uniaxial fatigue for plastics (ASTM D7791), adhesive shear fatigue (ASTM D3166), fatigue crack growth rate measurement (ASTM E647), creep-fatigue interaction testing (ASTM E2714), creep-fatigue crack growth (ASTM E2760), and cyclic fatigue testing for ceramics (ASTM C1360). Testing can be performed at ambient temperature, sub-ambient, and elevated temperatures. Load ratios, frequencies, waveforms, and stress or strain ranges are defined based on the test standard and the specific program requirements.
Applications
- S-N curve generation for metals and alloys for structural design data
- Low-cycle fatigue (LCF) testing for turbine, pressure vessel, and reactor component materials
- Fatigue crack growth rate (da/dN) measurement for fracture mechanics and damage tolerance assessments
- Plastic and polymer fatigue resistance evaluation for cyclic-load bearing components
- Adhesive joint fatigue performance characterization for bonded structure design
- Fine wire and medical device material fatigue testing under rotating bending
- Ceramic and ceramic matrix composite (CMC) cyclic fatigue resistance characterization
- Creep-fatigue interaction testing for high-temperature alloys in power generation and aerospace
- Component and assembly fatigue life validation under representative service loading
- Failure analysis and remaining life assessment for components with fatigue-related cracking
Benefits
- One point of contact for the full range of fatigue test types, material classes, and governing standards
- Test program scoping support to ensure the right method, specimen geometry, and parameters are selected upfront
- Access to labs capable of ambient, sub-ambient, and elevated temperature fatigue testing
- Results delivered in formats directly usable for FEA input, design code application, or material database entry
- Covers both specimen-level and component-level testing, depending on what the program requires
- Relevant standards include ASTM E466, E606, E647, E739, E2714, E2760, D3166, D7774, D7791, and C1360
- Faster lab matching and program coordination compared to sourcing and qualifying labs independently
Fatigue Testing Services Process
Test Program Scoping and Specimen Design
The fatigue test program is defined based on the material, application, failure mode of interest, and data requirements
1Specimen Preparation and Setup
Specimens are machined to the required geometry with surface finish and dimensional tolerances confirmed before testing.
2Cyclic Loading and Data Acquisition
Cyclic loading is applied at the specified parameters. Load, displacement,t or strain, and cycle count are recorded continuously
3Data Analysis and Reporting
Test data is processed to produce S-N curves, strain-life curves, cyclic stress-strain curves, da/dN versus delta-K curves
4Fatigue Testing Services Technical Specifications
| Parameter | Details |
|---|---|
| Service Type | Broad fatigue testing service -method and configuration selected based on material and objective |
| Material Types | Metals and alloys, plastics, adhesives, ceramics, ceramic matrix composites, fine wire |
| Test Types | Stress-life, strain-life, crack growth, rotating bending, flexural, uniaxial, creep-fatigue, component-level |
| Loading Modes | Axial tension-compression, rotating bending, flexural, torsion, and combined |
| Temperature Range | Sub-ambient, ambient, and elevated temperature (material and lab dependent) |
| Key Standards | ASTM E466, E606, E647, E739, E2714, E2760, E2948, D3166, D7774, D7791, C1360 |
Instrumentation Used for Fatigue Testing Services
- Servo-hydraulic and servo-electric axial fatigue testing machines (load and strain control)
- Rotating bending fatigue machines for fine wire and round bar specimens
- Flexural fatigue fixtures for three-point and four-point bending configurations
- Extensometers for direct gage section strain measurement
- Clip-on and knife-edge crack opening displacement gauges for crack growth testing
- High-temperature furnaces and induction heating systems for elevated temperature testing
- Optical microscopy and digital image correlation (DIC) systems for crack length measurement
- High-frequency resonance fatigue machines for high-cycle S-N testing
Fatigue Testing Services Results and Deliverables
- S-N (stress-life) curves with mean and statistical fit lines, where multiple replicate data points are generated
- Strain-life (epsilon-N) curves with elastic, plastic, and total strain amplitude components
- Fatigue crack growth rate curves (da/dN versus delta-K) including near-threshold and Paris regime data
- Cyclic stress-strain curves and cyclic hardening or softening response
- Fatigue life (cycles to initiation and/or failure) at each test condition
- Fracture surface images and failure mode classification
- Runout data points and endurance limit estimates where applicable
- Full test report with all raw data, processed results, specimen geometry, test parameters, and material identification formatted for design, analysis, or material database use
Frequently Asked Questions
Fatigue testing evaluates how a material behaves under repeated or cyclic loading over time. It helps determine the number of cycles a component can withstand before crack initiation or failure occurs.
Common methods include high-cycle fatigue (HCF), low-cycle fatigue (LCF), axial fatigue, rotating bending fatigue, and thermo-mechanical fatigue depending on the application and loading conditions.
Yes. Test parameters such as load amplitude, frequency, stress ratio, temperature, and environment can be adjusted to simulate actual operating conditions and failure scenarios.
Fatigue testing can be applied to metals, polymers, composites, weld joints, and finished components such as automotive, aerospace, and structural parts.
Results usually include S–N curves (stress vs. cycles), fatigue life prediction, crack initiation behavior, and failure mode analysis to support design validation and material selection.
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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