Section Modulus calculation and optimization
SECTION MODULUS
About section modulus
- Ratio of total moment resisted by the section to the stress in the extreme fibre
- It gives us an idea about how much of load the given structure can take
- if the section modulus increases the moment of resistance increases and hence its load bearing capacity.
Formula to find the section modulus
S=I/y where,
S - Section modulus
I - Moment of inertia value from the ineryia analysis
y - Distance from neutral axis to outermost fibre
here we are going to find section modulus for hood
intersecting the part by using plane
extracting both outer boundries
creating point and line then spliting extra part
join and fill the section
using measure inertia tool
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Product : Face...Fill.2...Part3
Date : Thursday, 08 April 2021 23:07:20
Author : Admin
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Component | Sub-Component | Area[m2] | Gx[mm] | Gy[mm] | Gz[mm] | M1[m4] | M2[m4] | IoxG[m4] | IoyG[m4] | IxyG[m4] |
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Face...Fill.2...Part3 | | 0.010 | 2.1055e-05 | 741.261 | -906.352 | 9.53534e-07 | 0.000147946 | 9.535e-007 | 1.479e-004 | -9.148e-020 |
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measuring total distance and we have to take half distance from neutral axis
we got total 483.835mm length
we need to take 483.835/2=241.9175
calculating section modulus for first section
S = I/y
here, I= 9.535*10^7m^4
y=241.9175
S = 9.535*10^7/241.9175
S = 39.414*10^6mm^4
calculation for next part
for that we have to take parallel curve 0.5mm
create point and line then fill
go for measure inertia and measure part
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Product : Face...Fill.3...Part3
Date : Thursday, 08 April 2021 23:14:44
Author : Admin
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Component | Sub-Component | Area[m2] | Gx[mm] | Gy[mm] | Gz[mm] | M1[m4] | M2[m4] | IoxG[m4] | IoyG[m4] | IxyG[m4] |
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Face...Fill.3...Part3 | | 0.010 | 1.0593e-05 | 741.161 | -907.008 | 9.98383e-07 | 0.000152907 | 9.984e-007 | 1.529e-004 | 1.193e-018 |
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section modulus calculation for second section
S = I/y
here, I= 9.98383*10^7m^4
y=241.9175
S = 9.98383*10^7/241.9175
S = 41.269*10^6mm^4
conclusion
So decreasing the distance between two panels leads to increase in section modulus, so resistance to bending also increases, and strength of hood also increases.