Root-Cause Failure Analysis: From Evidence to Mechanism
Structure an investigation that moves from observations to a defensible causal explanation.
Preserve the evidence
Document condition, orientation, loading history, environment and nearby components before cleaning or sectioning.
Separate mode, mechanism and cause
A fracture mode describes appearance; a mechanism explains damage physics; root cause explains why conditions allowed it.
Build and test hypotheses
Fractography, metallography, chemistry, mechanical tests and records should discriminate among competing explanations.
Avoid common traps
Do not stop at the first defect, confuse correlation with cause or ignore system-level contributors such as maintenance and design.
Engineering takeaway
A useful investigation ends with evidence-ranked causes and corrective actions that address recurrence, not only the broken part.