ASTM E399: Plane-Strain Toughness for Materials Testing

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SUMMARY

The discussion centers on ASTM E399, which outlines the requirements for measuring plane-strain toughness in materials testing. A key point is that thick specimens are necessary to accurately assess toughness, although the experiment referenced uses smaller thicknesses. Participants highlight the confusion surrounding the ASTM standards and seek resources for clearer explanations. The ASTM E399 standard specifies that the crack-tip plastic zone must be small relative to the crack size, specimen thickness, and ligament ahead of the crack.

PREREQUISITES
  • Understanding of ASTM standards, specifically ASTM E399
  • Knowledge of materials testing principles, particularly plane-strain toughness
  • Familiarity with crack mechanics and plastic zone concepts
  • Basic mechanical engineering concepts related to specimen thickness
NEXT STEPS
  • Research ASTM E399 for detailed specifications and requirements
  • Explore resources on plane-strain toughness testing methodologies
  • Learn about the significance of specimen thickness in materials testing
  • Find simplified guides or summaries of ASTM standards for easier comprehension
USEFUL FOR

Mechanical engineering students, materials scientists, and professionals involved in materials testing who seek to understand ASTM E399 and its application in evaluating plane-strain toughness.

hootsh
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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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