Bulk modulus, K, is the change in volume under hydrostatic pressure (i.e., the ratio of stress to strain) ( K is the reciprocal of compressibility.).Young’s modulus, E, is the ratio of uniaxial compressive (tensile) stress to the resultant strain.The modulus of elasticity is the ratio of stress to strainĭepending on the mode of the acting geological force and type of geological media the force is acting upon, three types of deformation can result as well as three elastic moduli that correspond to each type of deformation.Strain is the fractional distortion that results because of the acting force.Stress is the force applied per unit area.Hooke’s law describes the behavior of elastic materials and states that for small deformations, the resulting strain is proportional to the applied stress. Inelastic properties (fracture gradient and formation strength)Įlasticity is the property of matter that causes it to resist deformation in volume or shape.Elastic properties (Young’s modulus, shear modulus, bulk modulus, and Poisson’s ratio).
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