Stress Dependence of Energy Dissipation

• The stress-strain plot of a structural material (metals and metallic alloys are considered here) under harmonic loading and low stress level may be plotted as

Figure 9.1: Stress strain plot

• The energy dissipated per unit volume of a structural material per unit cycle is given by the area of the hysteresis loop (also known as mechanical hysteresis loop).
  
• This is generally denoted as (dissipated energy per per cycle)