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  2. Izod impact strength test - Wikipedia

    en.wikipedia.org/wiki/Izod_impact_strength_test

    The ASTM International standard for Izod Impact testing of plastics is ASTM D256. The results are expressed in energy lost per unit of thickness (such as ft·lb/in or J/cm) at the notch. Alternatively, the results may be reported as energy lost per unit cross-sectional area at the notch (J/m 2 or ft·lb/in 2).

  3. Thermoset polymer matrix - Wikipedia

    en.wikipedia.org/wiki/Thermoset_polymer_matrix

    Izod impact strength (ft·lb/in) 0.3-10.0 ... to give phenolic oligomers with methylene and benzylic ether-linked phenol units. ... are dependent on part size and ...

  4. Notch (engineering) - Wikipedia

    en.wikipedia.org/wiki/Notch_(engineering)

    The most common is the Charpy impact test, which uses a pendulum hammer (striker) to strike a horizontal notched specimen. The height of its subsequent swing-through is used to determine the energy absorbed during fracture. The Izod impact strength test uses a circular notched vertical specimen in a cantilever configuration. Charpy testing is ...

  5. Polycarbonate - Wikipedia

    en.wikipedia.org/wiki/Polycarbonate

    Polycarbonate is a durable material. Although it has high impact-resistance, it has low scratch-resistance. Therefore, a hard coating is applied to polycarbonate eyewear lenses and polycarbonate exterior automotive components.

  6. Fracture toughness - Wikipedia

    en.wikipedia.org/wiki/Fracture_toughness

    Strain energy release rate per unit fracture surface area is calculated by J-integral method which is a contour path integral around the crack tip where the path begins and ends on either crack surfaces. J-toughness value signifies the resistance of the material in terms of amount of stress energy required for a crack to grow.

  7. Charpy impact test - Wikipedia

    en.wikipedia.org/wiki/Charpy_impact_test

    For these reasons, impact tests are not widely used for assessing the fracture-resistance of low-strength materials whose fracture modes remain unchanged with temperature. Impact tests typically show a ductile-brittle transition for high-strength materials that do exhibit change in fracture mode with temperature such as body-centered cubic (BCC ...

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  9. Strength of materials - Wikipedia

    en.wikipedia.org/wiki/Strength_of_materials

    Often measured with the Izod impact strength test or Charpy impact test, both of which measure the impact energy required to fracture a sample. Volume, modulus of elasticity, distribution of forces, and yield strength affect the impact strength of a material. In order for a material or object to have a high impact strength, the stresses must be ...