Reducing the Collision Damage Done to the Tips of Steel Needles during Integrated Piercing by Using Shape Optimization with Feature Selection

Table 7

Feasible area of length of steel needle rod under strength constraint.

Point	Constraint plane	Fmax	L2
A′	Z = 6.056 × 10^7 Pa	≥2.73 N	20 mm
	Z = 6.056 × 10^7 Pa	1 N	≥7.07 mm
	Z = −6.056 × 10^7 Pa	≤46.36 N	20 mm
	Z = −6.056 × 10^7 Pa	50 N	≤27.5 mm
A″	Z = 6.056 × 10^7 Pa	≥79.98 N (not in defined domain)	20 mm
	Z = 6.056 × 10^7 Pa	50 N	−121.94 mm (not in defined domain)
	Z = −6.056 × 10^7 Pa	≥2.79 N	20 mm
	Z = −6.056 × 10^7 Pa	1 N	≥7.01 mm