Question $1$

$[8]$

a$.$ List the possible reasons of creep deformation? Define one of the reasons through diagram. $[1]$

continuous

conqous deform at ion underconsus load

$$ witatany lood

$0\mathrm{.}25$

Ex:thee

las $sin?$

b$.$ What is the practical importance of calculating principal stresses and their directions? $[0\mathrm{.}5]$

makit STronger

nger$)$

know the weake location and reainfoneeit Aare if need To$.$

$0\mathrm{.}5$

c$.$ If the principal stress direction is $23\mathrm{.}5$ degrees through calculations. Draw the plane on Mohr's circle where cartesian stresses are calculated. Also, draw the plane of maximum shear stresses. Draw the circle by hand, not on a $g$

$P_p=23\mathrm{.}5$ we have multelud by two

becume $=2ep=223\mathrm{.}5$

$=47$

d$.$ What is parallel axis theorem? Where is this theorem required to apply? $[1]$ the the bettewn the cinter of mass and the cintreic

e$.$ In case of the following composite material, draw its spring model and develop equivalent stiffness equation. $[$Bonus mark $1]$