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Fatigue Testing

ISO 4210 Dynamic Fatigue Testing: Horizontal and Vertical Stress Cycles in Titanium Stays

Subjecting prototype titanium frames to 100,000 pneumatic cycles at 1,200 Newtons to confirm infinite fatigue life.

By Astrid Lindholm, Bicycle Dynamicist September 05, 2026 • 7 min read
ISO 4210 Dynamic Fatigue Testing: Horizontal and Vertical Stress Cycles in Titanium Stays

The S-N Endurance Curve of Titanium Alloys

Unlike aluminum, titanium possesses a true fatigue endurance limit below which stresses can be cycled indefinitely without micro-crack growth.

Pneumatic Actuator Testing of Chainstay S-Bends

Testing chainstays under alternating pedal loads reveals whether curved tire clearance indentations create localized stress risers.

Drop-Weight Impact Resistance and Dent Tolerance

Dropping 50kg guided weights onto frame top tubes verifies that thin-wall titanium absorbs impacts elastically without catastrophic buckling.

⚠️ Technical & Safety Verification

The empirical methods outlined in this study reflect verified bicycle frame engineering & titanium metallurgy protocols and field measurements. Always verify safety standards and consult accredited specialists before executing structural or high-energy physical tests.

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