akv1234
Materials
- Sep 29, 2021
- 6



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Not if the defect leads to progressive failures. For example, fatigue damage from a defect happens over time.TugBoatEng said:A defect leading to this severe of a break would have happened immediately.
Quite a bit actually, especially if both cracks initiated and propagated from the same cause. For example, vibrations can cause multiple fatigue cracks at the same time. Also, the presence of one crack as it is growing (e.g. the fracture) can change the dynamics of loading, allowing a second crack to initiate and propagate.TubBoatEng said:There is a second crack. What is the likelihood of two such failures happening simultaneously on an engine that is running?
Stress risers associated with corners make them great locations for any crack to initiate.TugBoatEng said:The damage is on a corner, much more likely to strike first.
Not always true. Some materials like gray cast iron do not exhibit these features. Gray iron failures in fact are difficult to diagnose fracture mode for that very reason, so other methods have to be employed to identify likely mode.TugBoatEng said:There are no beach marks/corrosion so the failure likely happened abruptly.
MrFailure said:You can look for evidence to determine if the block had been dropped by looking for distortion or impact damage in the area it may have been dropped on.