“…In analytical approach, classical deformation theories could not describe the mechanical response of micro/nanoscale structures (i.e. micro/nanoshells (Mahinzare et al, 2017b; Mohammadi et al, 2017, 2018) and plates (Mahinzare et al, 2017a; Shojaeefard et al, 2017, 2018)) correctly; however, higher-order elasticity theories such as the couple stress and the nonlocal elasticity theory (NET) in conjunction with the classical ones would lead to a more accurate prediction for the mechanical behavior of micro/nanoscale structures (Koiter, 1969; Kolahchi, 2017; Mindlin, 1964; Mindlin and Tiersten, 1962; Shafiei et al, 2017; Shafiei and Kazemi, 2017; Toupin, 1962). In higher-order theories, some independent length-scale parameters are usually introduced as additional parameters to the classical formulations.…”