strength of material-3 - dr.a.shah...strength of material-3 shear stress dr. attaullah shah types of...
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Strength of Material-3Shear Stress
Dr. Attaullah Shah
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Types of supports and reactions:
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Units of Stress:
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� It is necessary to restrict the stresses in material due to: � To have safety against any errors
� Unknown vibrations, accidental loads and over loads
� Atmospheric erosions and decays etc.
� Due to high variability in material properties.
� Factor of Safety
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Shear Stress-Solved Examples� What force is required to punch a 20-mm-diameter
hole in a plate that is 25 mm thick? The shear strength is 350 MN/m2.
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Bearing Stresses: Solved Examples
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Stress strain diagram of material
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Hook's Law� In most of the material, the stress strain relationship is
linear i.e. Increase in stress leads to proportionate increase in the strain:
� E represents Young’s Modulus. For steel E is give as
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