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 Replies: 17 / Views: 2,078 |
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Pillar of the Community
United States
3331 Posts |
I am thinking this would be called a lamination crack. Would that be correct?  |
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Pillar of the Community
United States
2253 Posts |
Looks like it to me. That being said, your chances of it not being a lamination crack have greatly improved.
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Pillar of the Community
United States
538 Posts |
Looks like a lamination to me.
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Pillar of the Community
 United States
3331 Posts |
I am just not sure of the proper terminology. I am thinking that a (de)lamination would show the peeling edge around 3 sides of the feature and that a lamination crack would show along one line (edge) only?
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Pillar of the Community
United States
2253 Posts |
I am not an English major, but I believe to (de)laminate something would be to put it back together. Not even sure if delaminate is an English word. My spell check doesn't believe it is.
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Pillar of the Community
United States
3331 Posts |
https://en.wikipedia.org/wiki/DelaminationQuote:
Delamination is a mode of failure for composite materials[1] and steel.[2] In laminated materials, repeated cyclic stresses, impact, and so on can cause layers to separate, forming a mica-like structure of separate layers, with significant loss of mechanical toughness.
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Pillar of the Community
United States
2253 Posts |
And a darn good thing I didn't major in English. Thank you for the link.
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Pillar of the Community
United States
3331 Posts |
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Pillar of the Community
United States
3331 Posts |
I decided to search this question furthur. This discussion is interesting at this link: http://www.error-ref.com/?s=lamination+crackQuote:Lamination Cracks Definition: Lamination errors are planchet errors in which the surface of a coin cracks and flakes. It is generally believed that lamination errors are caused by contaminants in the alloy that cause the metal to separate along the horizontal plane. Lamination errors can develop before or after the strike. They are generally restricted to solid-alloy coins. The term "lamination error" is grammatically incorrect as the metal is actually delaminating. While "delamination error" would be the proper term, we're stuck with the terminology we've inherited from previous researchers. |
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Bedrock of the Community
United States
62064 Posts |
Looks like the edge of a lamination peel.
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Pillar of the Community
United States
3331 Posts |
Quote:
Looks like the edge of a lamination peel. can you say how that is different from a lamination crack? |
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Bedrock of the Community
United States
62064 Posts |
There is nothing to crack on a lamination. The edge where the peel occurred leaves that irregular line. A die crack leaves a raised area on the coin because where the crack happened, there is a small void that leaves a raised area on the coin. So how could it be called a lamination crack? The correct term be peel. But they are all considered under the term: 'A Lamination" issue. (peel)
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Pillar of the Community
United States
3331 Posts |
The term "lamination crack" is used in the reference I cited above. Quote:
A lamination crack is one common manifestation of a lamination error. The surface of the coin simply cracks and may lift up slightly on one side. Lamination cracks are sometimes mistaken for die cracks and split dies by novice collectors. I guess that is in error? |
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Bedrock of the Community
United States
62064 Posts |
Often experts don't agree exactly the same. I use the term that fits the description best the way I see it. Others may use a different term.
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Pillar of the Community
United States
3331 Posts |
Okay - I can accept that! Thanks!
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Pillar of the Community
United States
2253 Posts |
Hate to ask this but; Is a copper sheet actually laminated when it is fabricated. Probably not. Therefore can we actually have a delamination ?
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Replies: 17 / Views: 2,078 |
Posted 05/21/2016 10:57 am
