Astm E 647 Jun 2026

ASTM E647 specifies several standard specimen types to ensure results are independent of planar geometry:

The standard covers the range of crack growth rates typically encountered in engineering service (e.g., $10^-8$ to $10^-2$ m/cycle), spanning the so-called "Paris Region" (Stage II) and extending into the near-threshold (Stage I) and fast-fracture (Stage III) regimes. astm e 647