PDF Notes: SOM2AA2_Elastic Constants (1)

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    What defines elastic constants?

    They describe how materials deform under stress.

    What is the modulus of elasticity (E)?

    It measures a material's stiffness.

    How does Poisson's ratio (v) relate lateral strain to longitudinal strain?

    It is the ratio of lateral strain to longitudinal strain.

    What is the shear modulus (G)?

    It quantifies a material's response to shear stress.

    What is bulk modulus (K)?

    It measures a material's response to uniform pressure.

    How does the modulus of elasticity differ in materials?

    Higher in covalent compounds, lower in plastics.

    What happens to lateral strain when longitudinal strain is tensile?

    Lateral strains become compressive.

    What is longitudinal strain?

    It is the change in length per original length.

    What is lateral strain?

    It is the change in dimensions perpendicular to the load.

    How is volumetric strain calculated?

    It is the ratio of change in volume to original volume.

    What is the relationship between volumetric strain and elastic constants?

    Volumetric strain involves longitudinal and lateral strains.

    What does a higher Poisson's ratio indicate?

    Greater lateral contraction for a given longitudinal strain.

    What is the significance of Hooke's law?

    It states stress is proportional to strain within elastic limits.

    What is the formula for calculating shear stress?

    Shear stress equals shear force divided by shearing area.

    How does bulk modulus relate to volumetric strain?

    It is the ratio of direct stress to volumetric strain.

    What happens to a material's dimensions under axial loading?

    Length increases while lateral dimensions decrease.