MIL-HDBK-17-3F Volume 3.Chapter 1 General Information m -(1)mass (kg,Ib) -(2)number of half wave lengths -(3)metre -(4)slope N -(1)number of fatigue cycles to failure -(2)number of laminae in a laminate -(3)distributed in-plane forces on a panel(Ibf/in) -(4)Newton -(5)normalized NA neutral axis n -(1)number of times in a set -(2)number of half or total wavelengths -(3)number of fatigue cycles endured -(1)applied load (N,Ibf) -(2)exposure parameter -(3)probability -(4)specific resistance() P test ultimate load,(N.Ib per fastener) py test yield load,(N,Ib per fastener) p normal pressure (Pa.psi) psi -pounds per square inch area static moment of a cross-section(mm3,in) shear flow(N/m,lbf/in) R -(1)algebraic ratio of minimum load to maximum load in cyclic loading -(2)reduced ratio RA reduction of area R.H. -relative humidity RMS root-mean-square RT room temperature -(1)radius(mm,in) -(2)root radius (mm,in) -(3)reduced ratio(regression analysis) -(1)shear force(N,Ibf) -(2)nominal stress in fatigue(MPa,ksi) -(3)S-basis for mechanical property values -stress amplitude in fatigue(MPa,ksi) e fatigue limit(MPa,ksi) Sm mean stress in fatigue(MPa,ksi) max -highest algebraic value of stress in the stress cycle(MPa,ksi) Smin lowest algebraic value of stress in the stress cycle(MPa,ksi) SR -algebraic difference between the minimum and maximum stresses in one cycle(MPa,ksi) S.F. safety factor -(1)arc length(mm,in) -(2)H/C sandwich cell size (mm,in) T -(1)temperature (C,F) -(2)applied torsional moment(N-m,in-Ibf) Ta thermal decomposition temperature(C,F) Tr exposure temperature (C,F) glass transition temperature (C,F) melting temperature (C,F) -(1)thickness (mm,in) -(2)exposure time (s) -(3)elapsed time (s) -(1)volume (mm,in) -(2)shear force (N,Ibf) 1-6MIL-HDBK-17-3F Volume 3, Chapter 1 General Information 1-6 m - (1) mass (kg,lb) - (2) number of half wave lengths - (3) metre - (4) slope N - (1) number of fatigue cycles to failure - (2) number of laminae in a laminate - (3) distributed in-plane forces on a panel (lbf/in) - (4) Newton - (5) normalized NA - neutral axis n - (1) number of times in a set - (2) number of half or total wavelengths - (3) number of fatigue cycles endured P - (1) applied load (N,lbf) - (2) exposure parameter - (3) probability - (4) specific resistance (Ω) Pu - test ultimate load, (N,lb per fastener) Py - test yield load, (N,lb per fastener) p - normal pressure (Pa,psi) psi - pounds per square inch Q - area static moment of a cross-section (mm3 ,in3 ) q - shear flow (N/m,lbf/in) R - (1) algebraic ratio of minimum load to maximum load in cyclic loading - (2) reduced ratio RA - reduction of area R.H. - relative humidity RMS - root-mean-square RT - room temperature r - (1) radius (mm,in) - (2) root radius (mm,in) - (3) reduced ratio (regression analysis) S - (1) shear force (N,lbf) - (2) nominal stress in fatigue (MPa,ksi) - (3) S-basis for mechanical property values Sa - stress amplitude in fatigue (MPa,ksi) Se - fatigue limit (MPa,ksi) Sm - mean stress in fatigue (MPa,ksi) Smax - highest algebraic value of stress in the stress cycle (MPa,ksi) Smin - lowest algebraic value of stress in the stress cycle (MPa,ksi) SR - algebraic difference between the minimum and maximum stresses in one cycle (MPa,ksi) S.F. - safety factor s - (1) arc length (mm,in) - (2) H/C sandwich cell size (mm,in) T - (1) temperature (°C,°F) - (2) applied torsional moment (N-m,in-lbf) Td - thermal decomposition temperature (°C,°F) TF - exposure temperature (°C,°F) Tg - glass transition temperature (°C,°F) Tm - melting temperature (°C,°F) t - (1) thickness (mm,in) - (2) exposure time (s) - (3) elapsed time (s) V - (1) volume (mm3 ,in3 ) - (2) shear force (N,lbf)