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Failure Prevention Through Nondestructive Testing (2)
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In order to have a good idea of how sound a component is, usually at least two different inspection methods must be employed.
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by Debbie Aliya | December 3, 2010 | Comments (4)
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Failure Prevention Through Nondestructive Testing (part 1)
| Many types of critical equipment are subject to nondestructive testing methods, which are specified as part of a program to reduce the risk of unexpected structural failure.
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by Debbie Aliya | November 2, 2010 | Comments (0)
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The Light is Better
How Do You Know What You Think You Know? (part 2)
| Last week, we asked about a familiar image. Can you see the hag? Can you see the beautiful lady?
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by Debbie Aliya | July 13, 2010 | Comments (0)
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How Do You Know What You Think You Know?
| Do you ever wonder about whether what you know is right? Most of us don’t, unless we run into something that forces us to re-evaluate things.
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by Debbie Aliya | July 6, 2010 | Comments (0)
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Microfractography Interpretation (part 3)
| Sometimes, evaluation of fracture surfaces in the scanning electron microscope reveals features that do not easily fall into any of the classical crack categories.
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by Debbie Aliya | June 24, 2010 | Comments (0)
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What Metallurgical Testing Can, Cannot Reveal (part 1)
| Some people today have trouble telling the difference between science, technology and magic.
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by Debbie Aliya | May 21, 2010 | Comments (0)
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Microfractography Interpretation (Part 2)
Microfractography Interpretation (Part 1)
| Most of the failure analysis we have been talking about on this blog so far is about fractography and, specifically, about fractography that relates to the macro scale
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by Debbie Aliya | March 16, 2010 | Comments (0)
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Understanding the Value of Through and Case Hardening of Steels (Part 3)
| Now, here is where the idea of case hardening comes in.
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by Debbie Aliya | February 4, 2010 | Comments (0)
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Understanding the Value of Through and Case Hardening of Steels (Part 2)
| If, for now, we look at the “classical worst case,” or the outer fiber stress, y is 5. |
by Debbie Aliya | January 22, 2010 | Comments (0)
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Understanding the Value of Through and Case Hardening of Steels (Part 1)
| “Everyone knows” that heat treating steels with a quench-and-temper process can make them stronger.
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by Debbie Aliya | January 8, 2010 | Comments (0)
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What is Corrosion Fatigue? (Part 2)
| Before closing our discussion from last week, I will share some examples to illustrate the differences between normal ambient-temperature “corrosion-assisted fatigue” and “boiler-lingo corrosion fatigue.”
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by Debbie Aliya | November 20, 2009 | Comments (0)
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What is Corrosion Fatigue? (Part 1)
| Last summer, I was asked to help determine why a relatively new heat exchange that was part of an industrial boiler system had started springing leaks left and right.
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by Debbie Aliya | November 13, 2009 | Comments (0)
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What is a Thorough Component Failure Analysis (Part 3)
What is a Thorough Component Failure Analysis? (Part 2)
| Going back to our potential fracture analysis, in addition to the crack itself, other locations on the component and mating components of the assembly often contain key features that allow the failure to be understood.
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by Debbie Aliya | August 20, 2009 | Comments (0)
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What is a Thorough Component Failure Analysis? (Part 1)
| A thorough failure analysis will provide resources to address many issues in addition to determining whether the component met the requirements of the engineering print and whether there is evidence of “abuse” of the component.
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by Debbie Aliya | July 31, 2009 | Comments (0)
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Energy Savings, International Security and the 2020 Plan
Hydrogen Embrittlement in Hardened, Plated Steel (Part 2)
| In this second part, we conclude the discussion of hydrogen embrittlement.
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by Debbie Aliya | April 8, 2009 | Comments (0)
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Hydrogen Embrittlement in Hardened, Plated Steel
| There are probably few types of metallurgical damage that have as much misinformation swirling around as hydrogen embrittlement.
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by Debbie Aliya | March 27, 2009 | Comments (0)
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Torsion (Part 2)
| Sometimes the transverse fracture planes of a ductile torsional crack are readily identifiable.
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by Debbie Aliya | February 23, 2009 | Comments (0)
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Torsion (Part 1)
| Torsion is the name for the loading geometry experienced by the shaft of a screwdriver as the tip is held in the slot of a screw and the operator twists the handle (the important part here) while pushing down to drive the screw.
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by Debbie Aliya | February 16, 2009 | Comments (0)
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Basic Loading Geometries (Part 3) – More About Bending
| In the last entry, we saw several photos of parts that were broken due to loads applied to a long skinny part in a way that caused the part to bend, initially creating a crack perpendicular to the length of the part.
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by Debbie Aliya | January 23, 2009 | Comments (0)
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Basic Loading Geometries (Part 2) – Bending
Basic Loading Geometries – Tension and Compression
| In tensile loading, crack-opening stresses create cracks that are perpendicular to the loading direction.
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by Debbie Aliya | November 3, 2008 | Comments (0)
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Ductile and Brittle Cracks: Part 4
Ductile and Brittle Cracks: Part 3
Obvious and Not So Obvious Ductile and Brittle Fractures: Part Two
| Understanding how a component fails is an important step in understanding why a component fails. In order to understand how a component cracks, it is important to understand what loading geometry or geometries could have been responsible for the fracture.
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by Debbie Aliya | July 18, 2008 | Comments (1)
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Obvious and Not So Obvious Ductile and Brittle Fractures: Part 1
| Many engineers think it is pretty easy to distinguish a ductile from a brittle crack. However, many people have incomplete understandings of these concepts.
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by Debbie Aliya | July 7, 2008 | Comments (0)
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