a) The elongation of a segment is equal to its length divided by the total length L and multiplied by the total elongation δ. Elongation per unit length is called strain
i) Bar in tension = tensile strain (elongation or stretching) Positive sign
ii) Bar in compression = compressive strain (shortening) Negative sign
iii) The strain is called a normal strain because it is associated with normal stresses.
iv) Dimensionless quantity, but sometime mm/m, μm/m and sometimes expressed as a percent (%), especially when the strains are large.
Comments are closed.