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Physics Study Program Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung FI-1101 Fisika Dasar IA Kuliah 18 ELASTISITAS

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Physics Study Program - FMIPA | Institut Teknologi Bandung PHYSI S Materi Hari Ini Tegangan (stress) Regangan (strain) Modulus Elastisitas

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Physics Study Program - FMIPA | Institut Teknologi Bandung PHYSI S Elastisitas Adalah cabang dari Fisika yang menjelaskan tentang bagaimana suatu benda berubah bentuk ketika diberikan suatu gaya Real rigid bodies are elastic we can slightly change their dimensions by pulling, pushing, twisting or compressing them. Stress: Deforming force per unit area Strain: Unit deformation Tensile stress: associated with stretching Shearing stress Hydraulic stress Stress = Elasticity Modulus x Strain Elastic modulus: describes the elastic behavior (deformations) of objects as they respond to forces that act on them

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Physics Study Program - FMIPA | Institut Teknologi Bandung PHYSI S (1) Stress = cte x Strain Recovers original dimensions when stress removed. (2) Stress > yield strength S y specimen becomes permanently deformed. (3) Stress > ultimate strength S u specimen breaks. Tension and compression: ( F= force applied perpendicular to the area A of the object) ( fractional change in length of the specimen) Stress = (Young ’ s modulus) x Strain Shearing: ( F= force in the plane of the area A) ( fractional change in length of the specimen) Units of Young modulus: F/m 2 Stress = (Shear modulus) x Strain Hydraulic stress: Hydraulic Stress = (Bulk modulus) x Hydraulic compression

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Physics Study Program - FMIPA | Institut Teknologi Bandung PHYSI S Young ’ s Modulus Everything is a spring … … until it breaks!

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Physics Study Program - FMIPA | Institut Teknologi Bandung PHYSI S Shear Modulus Shear moduli and Young moduli are comparable in magnitude for most materials (Liquids have zero shear modulus)

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Physics Study Program - FMIPA | Institut Teknologi Bandung PHYSI S Pressure and Bulk Modulus Pressure is defined as force per unit area Unit of pressure is N/m 2 = Pascal (Pa) Atmospheric pressure ~ 10 5 Pa= 15psi 1 psi = 1 pound per square inch Bulk modulus B relates fractional volume change to pressure change

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Physics Study Program - FMIPA | Institut Teknologi Bandung PHYSI S Stress, Strain and Hooke ’ s law F/A or pressure are known as “ stress ” Fractional changes in length or volume are known as “ strain ” Above relations between stress and strain account for “ elastic ” behavior and Hooke ’ s law

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Physics Study Program - FMIPA | Institut Teknologi Bandung PHYSI S End of Section...

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1.To understand the keywords associated with the deformation of different types of solids 2.To be able to calculate stress, strain and hence Young’s modulus.

1.To understand the keywords associated with the deformation of different types of solids 2.To be able to calculate stress, strain and hence Young’s modulus.

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