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QBM is a Mechanical Engineer, Metallurgical Engineer, Materials Engineering Consultant with world-class expertise in failure analysis, metallurgical and mechanical engineering, metal and part manufacturing, service condition effects, limited information interpretation, and results presentation to non-metallurgists
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Fatigue is an oft studied problem. In the million cycle regions, theory and practice fit together so that fabricators build structures that avoid this issue. Notches are smoothed or reduced. Stresses are calculated and lowered etc.
However in the lower cycle region where both crack initiation and crack propagation take up significant portions life the expert has dealt with some interesting cases. One was a large piece of emergency electrical switching apparatus designed for a limited number of cycles. Qualification of a protective stainless bellows was done by test loading the bellows to a bit higher cyclic stress than usual and a bit longer life than required. This arbitrary standard had been met for years. One order of steel failed this test prompting concerns that there was something substandard. Investigation found that the fracture was in-fact fatigue, but no substandard attribute was found in the metal or fabrication. Extending the examination to a previous "passed" sample found an internal crack which had been initiated but had not yet progressed to leak status. The test was modified.
Read other articles by this KKAI Associate:
Welding In Producing Mill Environments
Liquid Metal Cracking Fracture Analysis
| Mechanical Engineer, Metallurgical Engineer, Materials Engineering Consultant, failure analysis, metallurgical and mechanical engineering, metal and part manufacturing, service condition effects, limited information interpretation, and results presentation to non-metallurgists | |
| Resume of QBL | metallurgical engineer, engineering, research engineer, engineering failure analysis, accident reconstruction consultant, specialist, forensic investigation, expert witness testimony, engineering consulting services |
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| Resume of ALD | metallurgist, foundry consultant, cast metals consultant, engineering failure analysis, accident investigation, accident reconstruction, specialist, forensic analysis investigation expert witness testimony, engineering consulting services |
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