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Home » Authors » Debbie Aliya

Articles by Debbie Aliya

Debbie Aliya

A Materials Engineering Vacation (part 2)

Debbie
Debbie Aliya
September 7, 2021
No Comments

On a trip with so many highlights, it’s hard to pick only a few. But if pressured, I would give first prize to the A.E. Seaman Mineral Museum, which is part of Michigan Tech. I literally had to pry my feet from the floor and force myself to move on to the next exhibit. After three hours, I had only seen half of the items. We went back on the same $8 ticket the next day it was open. My colleague was very patient and enjoyed the benches, while I barely noticed my aching feet.

 


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Debbie Aliya
TECHNICAL TALK

Engineering and Heat Treating for a Tooth Overlay Procedure: A Failure Analyst’s View

Debbie
Debbie Aliya
August 18, 2021
No Comments

Last month, my right rear-lower molar broke. As shown in Figure 1, the fracture event resulted in a chipped condition.


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Debbie Aliya

A Materials Engineering Vacation (part 1)

Debbie
Debbie Aliya
August 16, 2021
No Comments

One of my colleagues graduated from Michigan Technological University (MTU) in 1986 and had not been back since. He’s a mechanical engineer but has worked his entire career in the foundry industry. As an MTU alum, he gets invited to the school’s events, and that included a geology tour.


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Debbie Aliya

How to Recognize a Fatigue Crack (part 4)

Debbie
Debbie Aliya
July 7, 2021
3 Comments

Let’s wrap up our discussion on fatigue cracks.


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Debbie Aliya

How to Recognize a Fatigue Crack (part 3)

Debbie
Debbie Aliya
June 23, 2021
No Comments

How can we tell if it is a fatigue crack if the most well-known feature of a fatigue crack is not present? Figure 2 shows a tie rod from an injection-molding press. While there are a few faint and indistinct beach marks, we have another indicator: ratchet marks.


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Debbie Aliya

How to Recognize a Fatigue Crack (part 2)

Debbie
Debbie Aliya
June 15, 2021
No Comments

Eventually, people figured out that although the nominal stress (i.e., average stress) was low, a sharp corner, a corrosion pit, a scratch or a dent, damage from weld heat or many of a long list of other factors could result in a local area with the actual stress approaching the tensile-stress value. 


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Debbie Aliya

How to Recognize a Fatigue Crack (part 1)

Debbie
Debbie Aliya
June 7, 2021
No Comments

Spectacular structural collapses sometimes happen due to inadequate strength of the material used to make the structure. But machinery components, subject to stresses from rotational motion and/or vibrations, usually break due to fatigue.


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Debbie Aliya

Macro-Fractography Practice

Debbie
Debbie Aliya
May 10, 2021
No Comments

If you ever have the chance to walk in the woods after a major storm, you may amuse yourself trying to figure out why a particular tree was blown down while a nearby tree remains upright. You may see trees revealed to be rotten at the base, which tipped over, but took apparently healthy trees with them.


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ih0521-tt-fig1-900
Technical Talk

Failure Analysis: How to Recognize a Fatigue Crack

Debbie
Debbie Aliya
May 10, 2021
One Comment

Spectacular structural collapses sometimes happen due to inadequate strength of the material used to make the structure. But machinery components, subject to stresses from rotational motion and/or vibrations, usually break due to fatigue.


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Debbie Aliya

More about Fatigue (part 2)

Debbie
Debbie Aliya
April 21, 2021
No Comments

Figure 3 shows another crack that has only ratchet marks to tell us it has been propagating in fatigue. See the white arrows at lower left. There are a few more ratchets to the right of the ones that are marked.


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