Downloaded from https://www.everyspec.com LIST OF SYMBOLS-(continued) p. nozzle pressure at point x X. axial length of rifling in bore i r-vuruu i pi ., -,,, ,f h' m iior mont,• nerinheral PIMP = permissible individual maximum pressure distance of rifling around bore PMMP - permissible mean maximum pressure Y = yield sti-ngth r - radius at any point in tube wall; general a = coefficient of linear expansion; angl of expression for radius twist of rifling; half angle of diverging r.
= radius of nozzle approach area cone r, = radius of nozzle exit ag exit angle of rifling r, = radius of nozzle throat slope of conical surface of chamber; X R = radius of pendulum; projectile radius; equivalent of combined region bore radius ly = ratio of specific heats R. = ratio of effective stresses a = total deflection; total shrink interference; R, = frequency ratio general expression fir deflection; density RMP = rated maximum pressure of steel a = constant in equation for increasing twist 6, - deflection on jacket rifling = = deflection on liner . = length of free run 6, = deflection of mandrel SA = distance from breech of equivalent cham- 5 ,.
= deflection of ring due to shrink fit ber to A 6, = deflection of tube So = distance from breech of equivalent chain- A = loading density; general expression for ber to base of projectile relative radial deflection S, = factor of safety A, = required interference between tube and S= time; thickness; temperature at any mandrel point in wall A,, = maximum bag density of propellant S ... t.
= time of propellant gas period =, tangential unit strain = temperature at inner wall surface - = slope of wall; angular displacement of = temperature at outer wall surface projectile; general expression for angular = required wall thickness deflection T = rifling torque; period of pendulum 0,, = included angle of nozzle T, = rifling torque component due to pressure 6 = angular velocity of projectile T. = rifling torque component due to velocity 6 = angular acceleration of projectile AT = total temperature gradient - nozzle divergence angle correction factor v = projectile velocity at any point in bore . = axial stress factor V.
= muzzle velocity 1, = tangential stress factor V = = recoil velocity A = coefficient of friction V, = propellant bag space a = Poisson's ratio V, = nozzle entrance volume p = polar radius of gyration Vt = final gun volume -, = principal stress in axial direction V. = chamber volume =o. = axial stress caused by pressure W = weight; wall ratio; dynamic force of beam a, = axial thermal stress increment Ob, = bearing stress W -- weight of propellant charge; corrected a. = equivalent stress wall ratio =. = allowable equivalent stress W = = wall ratio of finished tube Ct = fillet bending stress Wi = wall ratio of jacket C.
= principal stress in radial direction W, = wall ratio of liner r,, - radial pressure stress W, = weight of projectile - radial shrink fit stress W, = weight of recoiling mass = radial thermal stress W, = weight of tube = principal stress in tangential direction x = axial length of rifling curve; linear ampli- O,,. = tangential stress produced by moment tude of pendulum q,. = tangelitial pressure stress l, i.