Fine-Wire Fracture Morphology Can Separate Cyclic Fatigue from a Material Problem

What the evidence preview establishes

Complementary fracture surfaces showed fatigue progression followed by final ductile shear. Surface, microstructure, and composition comparisons did not reveal a material-quality difference that explained the failures.

Why this case matters

Failure mechanism and system root cause are different questions. Fracture morphology can establish cyclic fatigue while system testing or mechanical review is still required to identify why the cyclic stress occurred.