Introduction to Aircraft Structural Analysis (Elsevier Aerospace Engineering)

260 CHAPTER 8 Columns

Fig.8.7

Elastic moduli for a material stressed above the elastic limit.

Fig.8.8

Determination of reduced elastic modulus.

stressdistributionischangedtotheformshowninFig.8.8(b);thelinearityofthedistributionfollows
fromanassumptionthatplanesectionsremainplane.
Astheaxialloadisunchangedbythedisturbance

∫d^1

0

σxdA=

∫d^2

0

σvdA (8.9)