- #1
Dell
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in the following question,
E=65 GPa
V=0.3
find the new length of the arc BD??
i have found the stresses
[tex]\sigma[/tex]xx=-56Mpa
[tex]\sigma[/tex]yy=0
[tex]\sigma[/tex]xy=-28Mpa
using hookes law i can find the strains
[tex]\epsilon[/tex]xx=-8.615e-5
[tex]\epsilon[/tex]yy=2.58e-4
0.5*[tex]\epsilon[/tex]xy=[tex]\gamma[/tex]=-1.12e-3
but how do i calculate the change in the arc using this? i would know how to solve this if i had some kind of angular strain- i need to use a polar system not Cartesian. is there any way to do this?
also how do i know the new angle DAB? i know that the XY axis' new angle is 90.06417, and the n,t system (axes tilted 45 degrees to XY) is also 90.06417 but how do i find DAB,? generally is there any way of knowing how the axis is strained, for example, has the X axis dropped 0.06417 degrees, or the Y axis opened up 0.06417 degrees, or a bit each??
in this specific case can i say that since there is no yy strain the x-axis stays at the same angle?
DA*=DA(1+[tex]\epsilon[/tex]tt)=4.999569cm
AB*=5.0012923cm
E=65 GPa
V=0.3
find the new length of the arc BD??
i have found the stresses
[tex]\sigma[/tex]xx=-56Mpa
[tex]\sigma[/tex]yy=0
[tex]\sigma[/tex]xy=-28Mpa
using hookes law i can find the strains
[tex]\epsilon[/tex]xx=-8.615e-5
[tex]\epsilon[/tex]yy=2.58e-4
0.5*[tex]\epsilon[/tex]xy=[tex]\gamma[/tex]=-1.12e-3
but how do i calculate the change in the arc using this? i would know how to solve this if i had some kind of angular strain- i need to use a polar system not Cartesian. is there any way to do this?
also how do i know the new angle DAB? i know that the XY axis' new angle is 90.06417, and the n,t system (axes tilted 45 degrees to XY) is also 90.06417 but how do i find DAB,? generally is there any way of knowing how the axis is strained, for example, has the X axis dropped 0.06417 degrees, or the Y axis opened up 0.06417 degrees, or a bit each??
in this specific case can i say that since there is no yy strain the x-axis stays at the same angle?
DA*=DA(1+[tex]\epsilon[/tex]tt)=4.999569cm
AB*=5.0012923cm
Last edited: