
CALCS	PROC062 HELICAL SPRING ANALYSIS



	NOTATION
	Talpha	tangent, spring pitch angle
	d	dia, spring wire
	n	no. active coils
	R	radius, coil, nominal
	P	force
	dx	displacement

APPLICATION

helical spring under axial loading

OUTPUT

stiffness & shear stress

SEE ALSO

other porcs & progs

THEORY

ROARK5,P319

GUIDANCE

guidance notes

INPUT FORMAT

LET Nm=:Nk=:Talpha=:d=:n=:R=:P=:PROC062


EXAMPLE
Call Statement
LET Nm=1:Nk=1:Talpha=3/13:d=.15:n=6:R=.65:P=.001:PROC062
Output
PROC062 HELICAL SPRING, Rev 170600
dx	= ((64PR^3n)/(G(Nm)d^4))(1-(3/64)(d/R)^2+(3+v(Nm))Talpha^2/(2(1+v(Nm))))	= 0.2787
K	= P/dx	= 3.588E-3
fs	= ((16PR)/(PId^3))(1+(5/8)(d/R)+(7/32)(d/R)^2)	= 1.134
UF	= fs/(Fy(Nm)*Ks(Nk))	= 0.8336
END062