In most engineering problems, the bulk modulus … The bulk modulus is analogous to the modu-lus of elasticity for solids; however, for fluids it is defined on a volume basis rather than in terms of the familiar one-dimensional stress–strain relation for solid bodies. The phase lag between the applied stress and measured strain reflects the material's tendency to flow (viscosity), while the sample recovery reflects the material's stiffness (modulus). Tensile stress (TS) is the stress at fracture TS may be less or greater than the yield strength. Shear modulus M c is a measure of the crosslink density; the smaller the value of Mc, the higher the cross-link density. Example - Density of Seawater in the Mariana Trench - the deepest known point in the Earth's oceans - 10994 m.. The bulk modulus (K) of a substance measures Rubbery materials have high values of bulk modulus (1.5 GPa to 2 GPa), low shear modulus (0.5 MPa to 10 MPa), and a Poisson’s ratio of 0.4995. See our Privacy Policy and User Agreement for details. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The bulk modulus of a solid influences the speed of sound and other mechanical waves in the material. For example, the value of K for steel is 1.6×10 11 N/m 2 and the value of K for glass is 4×10 10 N/m 2 . It is defined as the ratio between pressure increase and the resulting decrease in a material's volume. Hence, the bulk modulus is the only time-independent modulus or, in other words, it is not a viscoelastic but linear elastic property. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Variation of relaxation modulus … Stainless steel with Bulk Modulus 163 10 9 Pa is approximate 80 times harder to compress than water with Bulk Modulus 2.15 10 9 Pa. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. In most engineering problems, the bulk modulus … If you continue browsing the site, you agree to the use of cookies on this website. EXAMPLE: MIL-H-83282 oil has a coefficient of cubical thermal expansion of 0.00046/°F. The bulk modulus is a constant the describes how resistant a substance is to compression. This physics video tutorial explains how to solve problems associated with the bulk modulus of materials. 1 GPa = 10 9 Pa (N/m 2); Stainless steel with Bulk Modulus 163 10 9 Pa is aprox. Bulk modulus is used to measure how incompressible a solid is. Pi = initial pressure in Pa. Pf = final pressure in Pa. Bm = bulk modulus in Pa. This change, or deformation, is called strain (ε). It is defined as the ratio of normal stress to the volumetric strain within the elastic limit. Upcoming SlideShare. Looks like you’ve clipped this slide to already. The elastic modulus of the two infiltrating glasses is ∼67 GPa, while the bulk modulus for alumina and zirconia is 410 GPa and 240 GPa, respectively. Shear stress strain curve & modulus of rigidity (10.01.03.039), Bolivia seismic properties k. rainer massarsch, Hypoplasticity and Its Application in Grannular Mechanics. volume by 0.5%. The stresses can be resolved into nine components and the stress state can be described in terms of stress tensor as follows: Variation of relaxation modulus with temperature and time. Stresses can be axial—e.g., directional tension or simple compression—or shear (tangential), or all-sided (e.g., hydrostatic compression). This requires a pressure increase The relation provides the necessary recipe for fluid substitution. Bulk Modulus — the degree to which an object changes volume under applied pressure. 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