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  2. ANSI/ASME Y14.1 - Wikipedia

    en.wikipedia.org/wiki/ANSI/ASME_Y14.1

    A size chart illustrating the ANSI sizes. In 1992, the American National Standards Institute adopted ANSI/ASME Y14.1 Decimal Inch Drawing Sheet Size and Format, [1] which defined a regular series of paper sizes based upon the de facto standard 8 + 1 ⁄ 2 in × 11 in "letter" size to which it assigned the designation "ANSI A".

  3. Polycarbonate - Wikipedia

    en.wikipedia.org/wiki/Polycarbonate

    Other applications, including polycarbonate sheets, may have the anti-UV layer added as a special coating or a coextrusion for enhanced weathering resistance. Polycarbonate is also used as a printing substrate for nameplate and other forms of industrial grade under printed products. The polycarbonate provides a barrier to wear, the elements ...

  4. Polycarbonate (functional group) - Wikipedia

    en.wikipedia.org/wiki/Polycarbonate_(functional...

    A polycarbonate is an oxocarbon dianion consisting of a chain of carbonate units, where successive carbonyl groups are directly linked to each other by shared additional oxygen atoms. That is, they are the conjugate bases of polycarbonic acids , the conceptual anhydrides of carbonic acid , or polymers of carbon dioxide .

  5. Section modulus - Wikipedia

    en.wikipedia.org/wiki/Section_modulus

    Equations for the section moduli of common shapes are given below. The section moduli for various profiles are often available as numerical values in tables that list the properties of standard structural shapes. [2] Note: Both the elastic and plastic section moduli are different to the first moment of area. It is used to determine how shear ...

  6. Material selection - Wikipedia

    en.wikipedia.org/wiki/Material_selection

    Next, an equation for the performance index is derived. This equation numerically quantifies how desirable the material will be for a specific situation. By convention, a higher performance index denotes a better material. Lastly, the performance index is plotted on the Ashby chart. Visual inspection reveals the most desirable material.

  7. Mark–Houwink equation - Wikipedia

    en.wikipedia.org/wiki/Mark–Houwink_equation

    For example, if narrow molar mass distribution standards are available for polystyrene, these can be used to construct a calibration curve (typically vs. retention volume ) in eg. toluene at 40 °C. This calibration can then be used to determine the "polystyrene equivalent" molecular weight of a polyethylene sample if the Mark-Houwink ...

  8. ISO/IEC 7810 - Wikipedia

    en.wikipedia.org/wiki/ISO/IEC_7810

    ID-000 size card as part of ID-1 size card [ edit ] An "informative" (i.e. non-mandatory) annex [ 7 ] describes how an ID-000 sized card may be included in an ID-1 size card for processing (e.g. in an ID-1 reader), but with "relief areas around the perimeter of the ID-000 size card to allow it to be removed from the ID-1 size card without ...

  9. Crack growth resistance curve - Wikipedia

    en.wikipedia.org/wiki/Crack_growth_resistance_curve

    Size and geometry also plays a role in determining the shape of the R curve. A crack in a thin sheet tends to produce a steeper R curve than a crack in a thick plate because there is a low degree of stress triaxiality at the crack tip in the thin sheet while the material near the tip of the crack in the thick plate may be in plane strain.

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