Equation 7 · Part 1 · Why Materials Fail: Fracture, Flaws and the Inspection Interval
Symbol E
What this part means
the modulus.
Its job in the formula
E is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol E→Article meaning
Where the article explains it
For a through-thickness crack of half-length a in a linear-elastic plate with modulus E and surface energy , the critical remote stress is
The passage around this formula
Griffith’s criterion is an accounting statement. Extending a crack by a small increment releases stored elastic strain energy from the material that unloads around the new crack faces, and consumes energy in creating those faces. If the release exceeds the cost, extension is spontaneous and the crack runs. For a through-thickness crack of half-length a in a linear-elastic plate with modulus E and surface energy , the critical remote stress is
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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