Recent content by Biru

im very new to this forum..so i dunt quite know how to have all those fractions and powers and stuff.. so it will take me years to write the stuff i have got scribbled on a piece of paper infront of me

Sorry abt that..i shall do it rite away..2 mins..

have i got it wrong again??

So the length decreased by 596.831 nano meters? hence the outer circle diameter increased by 11.539 nano meters..so made it...116.0000115 mm... and the inner circle diameter increased by 9.947 nano meters..so made it 100.0000099 mm.. So..the wall thickness changed by 776.4085 pico meters?? NO?

i got -61.316 KPa for bob...is that rite?? bob = force / area..

Or is it...Pi x r1 squared - Pi x r2 squared??

is it Pi/4 x ((d1^2) - (d2^2))??

umm...the only formula i kno is that.. pi x radius squared... so wat wud it be for hollow pipe?? Pi x (bigger radius - smaller raidus) squared??

well first I worked out bob = Force / Area (CSA)..soo -180kn / pi x (116mm/2)squared! got sumthing like -17.032 mega pascals... then i worked out the change in length..using.. (bob x initial length) / Elasticity so (-17.032..MPa x 1.8) / 200GPa ..got me -153.289 nano meters...so bascially when...

umm...the wall thickness changes by 204 nano meters??

so change in diameter = -0.3 x -(change in length/initial length) x initial diameter?

rite..will i have to do it for both..the outside diameter and the inside diameter?

its basically lateral strain / direct strain...the ratio between the two strains in other words...its mostly always 0.28 - 0.38... helps??

0.3 haha sorry!

physical interpretation of poisson's ratio? how do you mean?