MT-1620 al.2002 Note: there is a load in the z-direction to cause these stresses, but generated o is much larger(similar to pressurized cylinder exampl Why is this valid? ook at moment arms Figure 13.2 Representation of force applied in beam fo 是2 Oxx moment arm is order of (h o,, moment arm is order of() ZZ and e>>h >0, for equilibrium Paul A Lagace @2001 Unit 13-5MIT - 16.20 Fall, 2002 Note: there is a load in the z-direction to cause these stresses, but generated σxx is much larger (similar to pressurized cylinder example) Why is this valid? Look at moment arms: Figure 13.2 Representation of force applied in beam σxx moment arm is order of (h) σzz moment arm is order of (l) and l >> h ⇒ σxx >> σzz for equilibrium Paul A. Lagace © 2001 Unit 13 - 5