PHYS 270 Chapter Notes - Chapter 2: Solid Mechanics, Fluid Mechanics, Partial Derivative
Document Summary
Displacement - absolute movement of a point with respect to a fixed reference frame. Deformation - the relative movement with respect to another point on the same body. To differentiate motion of a point due to translation from deformation, we need to measure changes in length. *it"s important to specify the reference value form which change is calculated. Lagrangian strain - computed using original undeformed geometry as a reference (usually used in solid mechanics) Eulerian strain - computed using the final deformed geometry as a reference (usually used in fluid mechanics) Either lagrangian or eulerian strain description can be used if material undergoes very large deformation depending on the analysis. Normal and shear strength are measures of change in length and angle. Using example of a balloon increasing in size: Lf lo = deformation of the line. Average normal strain the intensity of deformation as a ratio of deformation to original length.
