MT-1620 al.2002 2(1+ xy E Xy xy 2(1+v) (10-6) E 1/G 2(1+y) XZ XZ (10-7) only Ox, and o stresses exist Look at orthotropic case Xx v12yy13 0 11 230zz V32yy +Oxx, Ow, On=0 still equal zero Paul A. Lagace @2001 Unit 10-p. 11MIT - 16.20 Fall, 2002 ( ε = 21 + ν) xy σ = 0 ⇒ σ = 0 E xy xy ε = 21 + ν) yz σ ( E yz (10 - 6) 1/ G ( εxz = 21 + ν) σxz (10 - 7) E ⇒ only σxz and σyz stresses exist Look at orthotropic case: 1 εxx = E11 [σxx − ν12 σyy − ν13 σzz ] = 0 1 εyy = E22 [σyy − ν21 σxx − ν23 σzz ] = 0 1 εzz = E33 [σzz − ν31 σxx − ν32 σyy ] = 0 ⇒ σxx, σyy, σzz = 0 still equal zero Paul A. Lagace © 2001 Unit 10 - p. 11