Chapter9 - Chapter 9 Mechanical Properties Objectives...

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Chapter 9 Mechanical Properties Objectives • Describe behavior of materials under different types of forces • Describe conditions that cause deformation • Introduce mechanical tests used to measure mechanical properties
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Titanic
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Titanic Charpy Tests Modern Steel Titanic teel
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Spaceship Columbia
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Spaceship Columbia
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Elastic Deformation
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t a t o a o d d l l ε ν = − = = where and Poisson’s Ratio 2(1 ) E G = + For an isotropic material
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Tensile Testing Specimen geometry Test rig
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Tensile Testing L o a d i n g U l Permanent plastic deformation Recoverable elastic deformation
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Tensile Testing
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Tensile Testing Formation of the begins and continues to propagate through the gage until failure.
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True Engineering Tensile Testing
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Tensile Testing Typical FCC Metal Like Aluminum Typical Behavior for Carbon Steels
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Indicator of Toughness 0 f Ud ε σε = Area under the stress-strain response is an indicator of toughness. The units are: (force per unit area) x (length per unit length) = (force x length)per unit volume = energy per unit volume 1 2 3
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Chapter9 - Chapter 9 Mechanical Properties Objectives...

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