What caused these fractures?
In a failure analysis, the inspection of fracture faces can provide valuable information on the primary damage mechanism.
Typically, one can easily distinguish between fatigue and forced ruptures as well as between brittle and ductile failures. Even the direction of sectional loads can be identified.
In shafts, for example, revolving bending stress causes cracks in planes perpendicular to the axis whereas torsional oscillation leads to crack propagation at a 45° angle – if not guided by stress concentrations due to design features such as shoulders, keyways, and others.
Experience with the normal presentation of fracture faces due to a given loading scenario in a material allows Elgeti Engineering’s experts to identify the most feasible hypothesis for the root cause during an initial on-site inspection. Additional methods such as fractography by SEM, metallurgical inspection, or load measurements by strain gauges then yield the final proof.
If you want to find out more information visit the Elgeti Engineering website today!
Source: Elgeti Engineering