MT-1620 al.2002 Try to minimize M.o.s Too conservative too heavy Not conservative enough= plane falls out of sky(things have flown with negative m.o.s. So, begin with"operational envelope", the way the structure will be used Aircraft-->V-n diagram Spacecraft, etc Then add special conditions (gusts, etc. Also need to account for Environmental effects change in material properties causes stresses and strains Special conditions Lightning Impact etc Paul A Lagace @2001 Unit 2 -p 6MIT - 16.20 Fall, 2002 Try to minimize M.O.S. - Too conservative ⇒ too heavy - Not conservative enough ⇒ plane falls out of sky (things have flown with negative M.O.S.) So, begin with “operational envelope”, the way the structure will be used • Aircraft --> v-n diagram • Spacecraft, etc. Then add special conditions (gusts, etc.) Also need to account for • Environmental effects - change in material properties - causes stresses and strains • Special conditions - Lightning - Impact - etc. Paul A. Lagace © 2001 Unit 2 - p. 6