Elastic constants
Some parameters that describe the mechanical behavior of materials are constants, like Young’s modulus E. Some, like hardness, are not. Hardness depends on how the material was tested.
These are four constants that are most common
1- E—Young’s modulus (also referred to as the elastic modulus) is a material constant defined by Eq. 1 for a linear elastic material under uniaxial tensile or compressive stress. It is therefore the slope of a (?–?) curve where only elastic deformation occurs.
2. ?—Poisson’s ratio is the ratio of lateral strain to longitudinal strain for a given material subjected to uniform longitudinal stresses within the proportional limit. The term is found in certain equations associated with strength of materials.
3. ?—Shear modulus is the ratio of shear stress to shear strain within the proportional limit .
4. B—Bulk modulus is the ratio of stress to strain for hydrostatic compression. Sometimes an applied stress F/A results in decrease of volume. In such cases, there is a bulk modulus B of elasticity. The bulk modulus is negative because of decrease in V
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المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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