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chapter 7

# chapter 7 - Chapter 7 Mechanical Properties 7.1...

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Chapter 7 Mechanical Properties 第第第 第第第第 吉吉吉吉吉吉吉吉吉吉吉吉吉 吉吉吉

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10/11/11 Chapter 7 Mechanical Properties 2 1. Mechanical properties: The mechanical behavior of a material reflects the relationship between its response or deformation to an applied load or force. 1. Important mechanical properties: strength, hardness, ductility, stiffness. 7.1 INTRODUCTION 第第第第 第第 第第 第第 第第
10/11/11 Chapter 7 Mechanical Properties 3 1. Ways that load applied: Tension, Compression Shear torsion 7.2 CONCEPTS OF STRESS AND STRAIN 第第第第 第第第第 第第第第 第第第第

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10/11/11 Chapter 7 Mechanical Properties 4 2. TENSION TESTS: 7.2 CONCEPTS OF STRESS AND STRAIN 0 A F = σ 0 0 0 1 l l l l l = - = ε
10/11/11 Chapter 7 Mechanical Properties 5 3. COMPRESSION TESTS: 4. SHEAR AND TORSIONAL TESTS: 7.2 CONCEPTS OF STRESS AND STRAIN 0 A F = τ

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10/11/11 Chapter 7 Mechanical Properties 6 5. GEOMETRIC CONSIDERATIONS OF THE STRESS STATE: 7.2 CONCEPTS OF STRESS AND STRAIN 0 A F = σ = = + = = 2 2 sin cos sin 2 2 cos 1 cos 2 θ τ
10/11/11 Chapter 7 Mechanical Properties 7 1. Stress–strain diagram and modulus of elasticity: 7.3 STRESS–STRAIN BEHAVIOR ε σ E =

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10/11/11 Chapter 7 Mechanical Properties 8 2. Force versus interatomic separation to explain the elastic deformation: 7.3 STRESS–STRAIN BEHAVIOR
10/11/11 Chapter 7 Mechanical Properties 9 3. Elastic modulus depends on atomic bonding: 7.3 STRESS–STRAIN BEHAVIOR

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10/11/11 Chapter 7 Mechanical Properties 10 4.Shear stress and strain 7.3 STRESS–STRAIN BEHAVIOR AND 7.4 ANELASTICITY γ τ G = 7.4 ANELASTICITY Anelastic deformation: Time-dependent elastic (non permanent) deformation . 第第第
10/11/11 Chapter 7 Mechanical Properties 11 1. Poisson’s ratio 7.5 ELASTIC PROPERTIES OF MATERIALS z y z x ε ν - = - = ) 1 ( 2 + = G E

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10/11/11 Chapter 7 Mechanical Properties 12 7.6 TENSILE PROPERTIES 1. YIELDING AND YIELD STRENGTH
10/11/11 Chapter 7 Mechanical Properties 13 7.6 TENSILE PROPERTIES 2. TENSILE STRENGTH

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10/11/11 Chapter 7 Mechanical Properties 14 7.6 TENSILE PROPERTIES 3. DUCTILITY % 100 % 0 0 - = = l l l EL f δ % 100 % 0 0 - = = A A A RA f ψ 吉吉 , 吉吉吉
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chapter 7 - Chapter 7 Mechanical Properties 7.1...

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