. 2020 Mar 31;6(3):e03716. doi: 10.1016/j.heliyon.2020.e03716

Table 1.

List of optimization design variables.

	M	USP	SWI	SW
Design variables x	Plate thickness	Plate thickness Stiffener thickness Stiffener width Stiffener flange height	Plate thickness Center insert width Center insert skin thickness Fixed edge insert width Fixed edge insert skin thickness Free edge insert width Free edge insert skin thickness	Plate skin thickness Plate core thickness
Design variables x	$[t_{p}]$	$[t_{p}, t_{s}, w_{s}, h_{s}]$	$[t_{p}, w_{c i}, t_{s c i}, w_{f i x}, t_{s f i x}, w_{f r e e}, t_{s f r e e}]$	$[t_{p}, t_{s}]$