MIL-HDBK-17-3F Volume 3.Chapter 1 General Information W -(1)weight (N,Ibf) -(2)width (mm,in) -(3)Watt -distance along a coordinate axis Y nondimensional factor relating component geometry and flaw size y -(1)deflection(due to bending)of elastic curve of a beam(mm,in) -(2)distance from neutral axis to given point -(3)distance along a coordinate axis Z -section modulus,I/y (mm,in) a -coefficient of thermal expansion(m/m/C,in/in/F) Y shear strain (m/m,in/in) △ -difference(used as prefix to quantitative symbols) d -elongation or deflection (mm.in) e strain(m/m,in/in) e elastic strain (m/m,in/in) -plastic strain(m/m,in/in) μ -permeability m -plasticity reduction factor [n] intrinsic viscosity n* -dynamic complex viscosity 2 -Poisson's ratio 0 -(1)density (kg/m3,lb/in3) -(2)radius of gyration(mm,in) Pc -H/C sandwich core density (kg/m,Ib/in total.summation 0 standard deviation 0,T前 stress in j direction on surface whose outer normal is in i direction (i,j =1,2,3 or x,y,z) (MPa,ksi) T -applied shear stress(MPa,ksi) 0 -angular velocity (radians/s) 09 infinity 1.3.1.1 Constituent properties The following symbols apply specifically to the constituent properties of a typical composite material. E -Young's modulus of filament material (MPa,ksi) Em -Young's modulus of matrix material(MPa,ksi) E发 -Young's modulus of impregnated glass scrim cloth in the filament direction or in the warp di- rection of a fabric(MPa,ksi) E明 -Young's modulus of impregnated glass scrim cloth transverse to the filament direction or to the warp direction in a fabric(MPa,ksi) G shear modulus of filament material(MPa,ksi) G -shear modulus of matrix(MPa,ksi) Gy -shear modulus of impregnated glass scrim cloth(MPa,ksi) Gex -shear modulus of sandwich core along X-axis(MPa,ksi) Gey -shear modulus of sandwich core along Y-axis(MPa,ksi) -filament length(mm,in) a -coefficient of thermal expansion for filament material(m/m/C,in/in/F) coefficient of thermal expansion for matrix material(m/m/C,in/in/F) 1-7MIL-HDBK-17-3F Volume 3, Chapter 1 General Information 1-7 W - (1) weight (N,lbf) - (2) width (mm,in) - (3) Watt x - distance along a coordinate axis Y - nondimensional factor relating component geometry and flaw size y - (1) deflection (due to bending) of elastic curve of a beam (mm,in) - (2) distance from neutral axis to given point - (3) distance along a coordinate axis Z - section modulus, I/y (mm3 ,in3 ) α - coefficient of thermal expansion (m/m/°C,in/in/°F) γ - shear strain (m/m,in/in) ∆ - difference (used as prefix to quantitative symbols) δ - elongation or deflection (mm,in) ε - strain (m/m,in/in) ε e - elastic strain (m/m,in/in) ε p - plastic strain (m/m,in/in) µ - permeability η - plasticity reduction factor [η] - intrinsic viscosity η* - dynamic complex viscosity ν - Poisson's ratio ρ - (1) density (kg/m3,lb/in3) - (2) radius of gyration (mm,in) c ’ ρ - H/C sandwich core density (kg/m3 ,lb/in3 ) Σ - total, summation σ - standard deviation σij, τ ij - stress in j direction on surface whose outer normal is in i direction (i, j = 1, 2, 3 or x, y, z) (MPa,ksi) Τ - applied shear stress (MPa,ksi) ω - angular velocity (radians/s) ∞ - infinity 1.3.1.1 Constituent properties The following symbols apply specifically to the constituent properties of a typical composite material. Ef - Young's modulus of filament material (MPa,ksi) Em - Young's modulus of matrix material (MPa,ksi) x g E - Young's modulus of impregnated glass scrim cloth in the filament direction or in the warp di￾rection of a fabric (MPa,ksi) y g E - Young's modulus of impregnated glass scrim cloth transverse to the filament direction or to the warp direction in a fabric (MPa,ksi) Gf - shear modulus of filament material (MPa,ksi) Gm - shear modulus of matrix (MPa,ksi) xy g G - shear modulus of impregnated glass scrim cloth (MPa,ksi) cx ’ G - shear modulus of sandwich core along X-axis (MPa,ksi) cy ’ G - shear modulus of sandwich core along Y-axis (MPa,ksi) A - filament length (mm,in) α f - coefficient of thermal expansion for filament material (m/m/°C,in/in/°F) α m - coefficient of thermal expansion for matrix material (m/m/°C,in/in/°F)