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  2. Corrosion fatigue - Wikipedia

    en.wikipedia.org/wiki/Corrosion_fatigue

    In true corrosion fatigue, the fatigue-crack-growth rate is enhanced by corrosion; this effect is seen in all three regions of the fatigue-crack growth-rate diagram. The diagram on the left is a schematic of crack-growth rate under true corrosion fatigue; the curve shifts to a lower stress-intensity-factor range in the corrosive environment.

  3. Crack growth equation - Wikipedia

    en.wikipedia.org/wiki/Crack_growth_equation

    The crack growth rate behaviour with respect to the alternating stress intensity can be explained in different regimes (see, figure 1) as follows Regime A: At low growth rates, variations in microstructure, mean stress (or load ratio), and environment have significant effects on the crack propagation rates. It is observed at low load ratios ...

  4. New York State Department of Environmental Conservation

    en.wikipedia.org/wiki/New_York_State_Department...

    The New York State Department of Environmental Conservation (informally referred to as NYSDEC, DEC, EnCon or NYSENCON) is a department of New York state government. [4] The department guides and regulates the conservation, improvement, and protection of New York's natural resources; manages Forest Preserve lands in the Adirondack and Catskill parks, state forest lands, and wildlife management ...

  5. Fastran - Wikipedia

    en.wikipedia.org/wiki/Fastran

    Fastran was written in the 1980s by James C. Newman while at NASA and is an acronym derived from NASA FATIGUE CRACK GROWTH STRUCTURAL ANALYSIS. [2] Crack closure was first observed by Wolf Elber as propping open a crack tip resulting in a reduction of the full stress intensity range or crack tip driving force. [3]

  6. Hydrogen embrittlement - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_embrittlement

    This is most clearly seen from fatigue measurements where the measured crack growth rates [24] can be an order of magnitude higher in hydrogen than in air. That this effect is due to adsorption, which saturates when the crack surface is completely covered, is understood from the weak dependence of the effect on the pressure of hydrogen.

  7. Charpy impact test - Wikipedia

    en.wikipedia.org/wiki/Charpy_impact_test

    In materials science, the Charpy impact test, also known as the Charpy V-notch test, is a standardized high strain rate test which determines the amount of energy absorbed by a material during fracture. Absorbed energy is a measure of the material's notch toughness. It is widely used in industry, since it is easy to prepare and conduct and ...

  8. Striation (fatigue) - Wikipedia

    en.wikipedia.org/wiki/Striation_(fatigue)

    The rate of growth can be predicted with a crack growth equation such as the Paris-Erdogan equation. Defects such as inclusions and grain boundaries may locally slow down the rate of growth. Variable amplitude loads produce striations of different widths and the study of these striation patterns has been used to understand fatigue.

  9. Compact tension specimen - Wikipedia

    en.wikipedia.org/wiki/Compact_tension_specimen

    The stress intensity factor at the crack tip of a compact tension specimen is [4] = [() / / + / / + /] where is the applied load, is the thickness of the specimen, is the crack length, and is the effective width of the specimen being the distance between the centreline of the holes and the backface of the coupon.

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