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Deformation of Solids. Stress is proportional to Strain stress = elastic modulus * strain The SI unit for stress is the Newton per meter squared (N/m 2 ), which is also called the Pascal (Pa). Young’s Modulus – elasticity in length. When an object is stretched (compressed) lengthwise.
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Deformation of Solids • Stress is proportional to Strain stress = elastic modulus * strain • The SI unit for stress is the Newton per meter squared (N/m2), which is also called the Pascal (Pa)
Young’s Modulus – elasticity in length • When an object is stretched (compressed) lengthwise. • Tensile Stress = • Y is called Young’s Modulus, Lo is the original length, and DL is the change in length.
Shear Modulus – elasticity of shape • Shear stress occurs when a force acts parallel to the surface of an object • Shear Stress = • S is the shear modulus, Dx is the horizontal distance the sheared face moves, h is the height of the object.
Bulk Modulus –volume elasticity • Volume stress has to do with uniform squeezing (like when an object is submersed in a fluid). • Volume Stress = • B is the bulk modulus, DV is the change in volume, and V is the original volume. • The negative sign is there because an increase in the pressure will decrease the volume.
