CV2101 chapt9 - Mechanical peoperties of materials

CV2101 chapt9 - Mechanical peoperties of materials -...

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Unformatted text preview: Chapter 9 Mechanical Properties of Materials Objective • To show how stress can be related to strain by using experimental methods to determine stress-strain diagram for a particular material • To discuss the properties of the stress-strain diagram for materials commonly used in engineering • To discuss other mechanical properties and tests related to the evelopment of mechanics of materials development of mechanics of materials 9-2 Chapter 9 Mechanical Properties of Materials Chapter 9 Mechanical Properties of Materials Tension Test Tension or compression test is primarily used to determine the relationship between the average normal stress and average l t i normal strain in many engineering materials 9-3 Chapter 9 Mechanical Properties of Materials Chapter 9 Mechanical Properties of Materials Stress-Strain Diagram Conventional stress-strain diagram The plot of the nominal or engineering stress by dividing the applied load P by the specimen’s original cross-sectional area A and the nominal or engineering strain by dividing the change in the specimen’s gauge length δ by the ecimen’s original length specimen s original length L True stress-strain diagram Actual cross-sectional area and specimen length are used instead of the original cross-sectional area and original specimen ngth length 9-4 Chapter 9 Mechanical Properties of Materials Chapter 9 Mechanical Properties of Materials Stress-Strain Behaviour of Ductile Materials 420 280 Pa ) 140 σ ( MP 9-5 Chapter 9 Mechanical Properties of Materials Chapter 9 Mechanical Properties of Materials Stress-Strain Behaviour of Brittle Materials 9-6 Chapter 9 Mechanical Properties of Materials Chapter 9 Mechanical Properties of Materials Hooke’s Law: Modulus of Elasticity...
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