LSN04 - ME4123/6123: Failure of Engineering Materials: Lsn...

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Unformatted text preview: ME4123/6123: Failure of Engineering Materials: Lsn 4: Mechanics of Material 500 300 50 50 100 50kN 200 75 Where will be this beam break? Mechanical Properties of Metals How do metals respond to external loads? Stress and Strain Tension Compression Shear Torsion Elastic deformation Plastic Deformation Yield Strength Tensile Strength Ductility Toughness Hardness Mechanics of Materials (stress & strain) Simple geometries + loading ---> Analytical solution Complex geometries + loading ----> Finite element analysis Types of Loading 100 200 300 400 500 600 0.05 0.1 0.15 compression tension torsion stress (MPa) effective strain Question? Relative measure of how much force a material experiences Relative measure of how much deformation a material experiences Concepts of Stress and Strain (tension and compression) Engineering stress: F is load applied perpendicular to specimen cross-section; A is cross- sectional area (perpendicular to the force) before application of the load. Engineering strain: l is change in length, l o is the original length. These definitions of stress and strain allow one to compare test results for specimens of different cross-sectional area A and of different length l . Concepts of Stress and Strain...
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LSN04 - ME4123/6123: Failure of Engineering Materials: Lsn...

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