ASTM E399: Plane-Strain Toughness for Materials Testing

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ASTM E399 outlines the requirements for measuring plane-strain toughness, emphasizing the need for thick specimens to ensure accurate results. However, the discussion highlights confusion regarding the use of thinner specimens in experiments, questioning how this aligns with the standard's guidelines. Participants note that even a specimen that appears thin can still be considered "thick" if the crack-tip plastic zone is small relative to the crack size and specimen thickness. There is a call for more accessible resources or simplified explanations of ASTM standards, as the current documentation can be overwhelming for students. Overall, clarity on specimen thickness and better educational materials are sought to aid understanding of these testing standards.
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Hi, I hate the fact that my first post in forum is all about wanting not giving, but I'm only at 1st year mechanical so I don't think there'e much to give :DI was wondering about E399 in the ASTM standard, according to this video (last minute):
Code: 
http://www.youtube.com/watch?v=WlFs2unBvdU

We have to have thick specimens in order to properly measure plane-strain toughness, but they use small thickness in the experiment.

Also is there any website or material where I can find the simplification or summarization of these ASTM standards? The way they explain these tests is a bit too complicated and massively messy for a student like me, really poor documentation in my opinion, but maybe its because I'm new at this.

Thanks in advance. :)
 
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How thick is thick?

ASTM E399: " the crack-tip plastic zone is small compared to the crack size, specimen thickness, and ligament ahead of the crack."

So for a brittle material with a small plastic zone, the specimen may appear to be a thin plate rather than a cube-shaped block and still be considered "thick".
 
Oh, it actually says that in the experiment?

How could I have missed that xD ?

Thanks a lot for the help mate.
 
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