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ch. 6 notes

# ch. 6 notes - Ch 6 Mechanical Properties I States of Stress...

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Ch. 6 Mechanical Properties I. States of Stress A. Simple tension: cable A o = cross sectional Area (when unloaded) F F 1. Stress=F/A0 B. Simple shear: drive shaft M M A o 2R F s A c 1. δ =Fs/A0 2. Sliding stress. Moves along plane C. Simple compression 1. δ =F/A0 D. Bi-axial tension 1. There exists tension on two axes 2. A pressurized air tank is an example E. Hydrostatic compression 1.Pressure exists on all axes 2.Example is a fish underwater

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II. Elastic Deformation A. Reversible deformation B. The figures below show that if a bar is pulled down and then released the bonds will stretch and then return to normal F δ bonds stretch return to initial C. Elastic deformation exists in both linear and nonlinear states, the return to equilibrium will occur on the same line F δ Linear- elastic Non-Linear- elastic III. Plastic Deformation (metals) A. From figures below metals slide along close packed planes that when the force is released the bonds do not return to normal planes still sheared F δ elastic + plastic bonds stretch & planes shear δ plastic
B. The graph of force and displacement shows that the bonds relieve the elastic deformation but the plastic deformation remains F δ linear elastic linear elastic δ plastic IV. Engineering Stress A. Tensile stress is defined as Ft/Ao Area, A F t F t B. Shear stress is defined as Fs/A0

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ch. 6 notes - Ch 6 Mechanical Properties I States of Stress...

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